Toyota Avalon (XX50): Power Door Lock Control System(for Gasoline Model)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Door Lock / Power Door Lock Control System(for Gasoline Model)

All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the door control switch assembly and activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

PROCEDURE

1.	READ VALUE USING TECHSTREAM (Door Lock SW-Lock, Door Lock SW-Unlock)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Door Lock SW-Lock	Door control switch assembly lock signal	OFF or ON	OFF: Lock side of door control switch assembly not pushed ON: Lock side of door control switch assembly pushed	-
Door Lock SW-Unlock	Door control switch assembly unlock signal	OFF or ON	OFF: Unlock side of door control switch assembly not pushed ON: Unlock side of door control switch assembly pushed	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Door Lock SW-Lock

Door control switch assembly lock signal

OFF or ON

OFF: Lock side of door control switch assembly not pushed

ON: Lock side of door control switch assembly pushed

Door Lock SW-Unlock

Door control switch assembly unlock signal

OFF or ON

OFF: Unlock side of door control switch assembly not pushed

ON: Unlock side of door control switch assembly pushed

Body Electrical > Main Body > Data List

Tester Display
Door Lock SW-Lock
Door Lock SW-Unlock

OK:

The Techstream indicates ON or OFF according to the switch operation shown in the table.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

2.	INSPECT DOOR CONTROL SWITCH ASSEMBLY

(a) Remove the door control switch assembly.

Click here

(b) Inspect the door control switch assembly.

Click here

REPLACE DOOR CONTROL SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (DOOR CONTROL SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4A and 4D instrument panel junction block assembly connectors.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I3-2 (UL) - 4A-39	Always	Below 1 Ω
I3-4 (L) - 4D-16	Always	Below 1 Ω
I3-5 (E) - Body ground	Always	Below 1 Ω
4A-39 or I3-2 (UL) - Body ground	Always	10 kΩ or higher
4D-16 or I3-4 (L) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU).

Component without harness connected

(Instrument Panel Junction Block Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
MB-22 (UL1) - 4A-39	Always	Below 1 Ω
MB-20 (L1) - 4D-16	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

All Doors LOCK/UNLOCK Functions do not Operate Via Door Key Cylinder

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the door key lock and unlock switch (front door lock with motor assembly LH) and driver door key cylinder lock or unlock switch signals from the front door lock with motor assembly LH. The main body ECU (multiplex network body ECU) activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

PROCEDURE

1.	READ VALUE USING TECHSTREAM (Door Key SW-Lock, D Door Key SW-UL)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Door Key SW-Lock	Driver door key-linked lock / unlock switch lock signal	OFF or ON	OFF: Driver door key cylinder not turned to lock position ON: Driver door key cylinder turned to lock position	-
D Door Key SW-UL	Driver door key-linked lock / unlock switch unlock signal	OFF or ON	OFF: Driver door key cylinder not turned to unlock position ON: Driver door key cylinder turned to unlock position	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Door Key SW-Lock

Driver door key-linked lock / unlock switch lock signal

OFF or ON

OFF: Driver door key cylinder not turned to lock position

ON: Driver door key cylinder turned to lock position

D Door Key SW-UL

Driver door key-linked lock / unlock switch unlock signal

OFF or ON

OFF: Driver door key cylinder not turned to unlock position

ON: Driver door key cylinder turned to unlock position

Body Electrical > Main Body > Data List

Tester Display
Door Key SW-Lock
D Door Key SW-UL

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

2.	INSPECT FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH

(a) Remove the front door lock with motor assembly LH.

Click here

(b) Inspect the front door lock with motor assembly LH.

Click here

REPLACE FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH

3.	CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the G34 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I27-9 (L) - G34-18 (L2)	Always	Below 1 Ω
I27-10 (UL) - G34-17 (UL3)	Always	Below 1 Ω
I27-7 (E) - Body ground	Always	Below 1 Ω
I27-9 (L) or G34-18 (L2) - Body ground	Always	10 kΩ or higher
I27-10 (UL) or G34-17 (UL3) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

All Doors LOCK/UNLOCK Functions do not Operate Via Master Switch

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the multiplex network master switch assembly and driver door key cylinder lock or unlock switch signals from the front door lock with motor assembly LH. The main body ECU (multiplex network body ECU) activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The power door lock control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

1.	CHECK FOR DTC (LIN COMMUNICATION SYSTEM)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Clear DTCs.

(e) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B1206 is not output.

GO TO LIN COMMUNICATION SYSTEM (DTC B1206)

2.	REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Replace the multiplex network master switch assembly.

Click here

3.	CHECK DOOR LOCK OPERATION

(a) Check that all doors can be locked and unlocked by the multiplex network master switch assembly.

Click here

OK:

All doors can be locked and unlocked by the multiplex network master switch assembly.

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GSW Terminal Circuit Malfunction (B1243)

DESCRIPTION

If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU (multiplex network body ECU) is detected, DTC B1243 will be stored.

HINT:

If DTC B1243 is stored, the automatic door lock function, and collision door lock release function will be prohibited.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1243	GSW Terminal Circuit Malfunction	A malfunction occurs in the GSW input circuit of the main body ECU (multiplex network body ECU).	Main body ECU (multiplex network body ECU) Airbag ECU assembly Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B1243 is not output.

USE SIMULATION METHOD TO CHECK

2.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (GSW VOLTAGE)

(a) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

Turning the engine switch on (IG) with the airbag ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(b) Disconnect the G50 airbag ECU assembly connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G50-25 (GSW) - Body ground	Engine switch on (IG)	4.3 to 5.5 V

*a	Front view of wire harness connector (to Airbag ECU Assembly)

GO TO STEP 5

3.	REPLACE AIR BAG ECU ASSEMBLY

(a) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(b) Replace the airbag ECU assembly.

Click here

4.	CHECK DTC OUTPUT

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B1243 is not output.

END (AIRBAG ECU ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

5.	CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(b) Disconnect the 4A instrument panel junction block assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G50-25 (GSW) - 4A-7	Always	Below 1 Ω
4A-7 or G50-25 (GSW) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU).

Component without harness connected

(Instrument Panel Junction Block Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
MB-24 (GSW) - 4A-7	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

NOTICE:

If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
The operation history function uses the current system time of the Techstream and the time counter inside the controlling ECU to calculate the times shown in the operation history. For this reason, before reading the operation history, first make sure that the Techstream system clock is accurately set to the current time.
Door lock/unlock operation history will not be stored when using a door lock knob.
If a door lock operation request is performed when a door is not fully closed, the door lock operation will not be performed, the door not fully closed warning buzzer will sound, and operation history will not be stored.

Operation History

HINT:

The main body ECU (multiplex network body ECU) stores Operation History, which can be read using the Techstream, when a malfunction of the power door lock control system occurs.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Utility / Operation History.

Body Electrical > Main Body > Utility

Tester Display
Operation History

(e) According to the display on the Techstream, read and save the operation history.

Operation History List
Manual Lock
Door Key Linked Lock
Wireless Lock
Wireless Auto Lock (30s)
Wireless Double Lock Set
Auto Entry Lock
Auto Entry Double Lock Set
Auto Entry Lock (30s)
Power Back Door Lock signal by Back Door Control Switch
Shift Linked Auto Lock
Vehicle Speed Linked Auto Lock (North America)
Security Forced Lock
Auto Lock Switch Answerback Lock
Door Lock by Active Test
Accessory Auto Lock
Remote Door Lock
Door Lock by A/C
Manual Unlock
D-Seat Key Linked Unlock (Twice)
Door Key Linked Unlock
Wireless Unlock (Twice)
Wireless Unlock
Accessory Auto Entry Unlock
Auto Entry Unlock
Auto Entry Preparation Unlock
Unlock by kick Sensor Input
Key in Vehicle Detected Unlock
Key Detected Unlock 1
Key Detected Unlock 2
Key Detected Unlock 3
Unlock by Emblem Sensor Input
Urgent Stop Support Unlock
Shift Linked Auto Unlock
Door Open/Close Linked Auto Unlock
Shock Detection Unlock
Door Unlock by Active Test
Accessory Auto Unlock
Auto Lock Switch Answerback Unlock
Remote Door Unlock
One Motion PBD Open/Stop judgment during the closing operation
Unlock by kick Sensor Input
One Motion PSD Open/Stop judgment during the closing operation
Fail Safe Unset

HINT:

Depending on the specifications of the vehicle some items may not be displayed.

Symptom Simulation

Click here

Customize Parameters

CUSTOMIZE PARAMETERS

CUSTOMIZE POWER DOOR LOCK CONTROL SYSTEM

HINT:

The following items can be customized.

NOTICE:

When the customer requests a change in a function, first make sure that the function can be customized.
Be sure to make a note of the current settings before customizing.
When troubleshooting a function, first make sure that the function is set to the default setting.

(a) Customizing with the Techstream

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Customize Setting / Door Lock.

(5) Select the setting by referring to the table below.

Door Lock

Tester Display	Description	Default	Setting	ECU
Unlock Key Twice	Function that unlocks only the driver door when the driver door key cylinder is turned to unlock once, and unlocks all doors when it is turned to unlock twice. For the OFF setting, turning it once unlocks all doors.	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Automatic Door Lock Function	Link Shift: Function that locks all doors when the shift lever is moved out of P, with the engine switch on (IG) and all doors closed Link Speed: Function that locks all of the doors when the vehicle speed reaches a certain level	Link Shift	00:OFF,01:Link Shift,10:Link Speed	Main body ECU (Multiplex network body ECU)
Automatic Door Unlock Function	Link D-door: Function that unlocks the other doors when the driver door is opened within approximately 43 seconds of the engine switch being turned off Link Shift: Function that unlocks all doors when the shift lever is moved to P from any position other than P with the engine switch on (IG)	Link Shift	00:OFF,01:Link D-door,10:Link Shift	Main body ECU (Multiplex network body ECU)

(b) Customizing with the multi-display

(1) Turn the engine switch on (IG).

(2) Enter the following menus: MENU / Setup / Vehicle / Vehicle Customization / Door Lock Settings.

(3) Select the setting by referring to the table below.

Display	Description	Default	Setting	Relevant ECU
Automatic Door Lock	By Shift from P: Function that locks all doors when the shift lever is moved out of P, with the engine switch on (IG) and all doors closed By Speed: Function that locks all of the doors when the vehicle speed reaches a certain level	By Shift from P	By Speed, By Shift from P or Off	Main body ECU (Multiplex network body ECU)
Automatic Door Unlock	By Driver Door: Function that unlocks the other doors when the driver door is opened within approximately 43 seconds of the engine switch being turned off By Shift to P: Function that unlocks all doors when the shift lever is moved to P from any position other than P with the engine switch on (IG)	By Shift to P	By Shift to P, By Driver Door or Off	Main body ECU (Multiplex network body ECU)

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body or Master Switch / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
ACC SW	Engine switch on (ACC) signal	OFF or ON	OFF: Engine switch off ON: Engine switch on (ACC)	-
IG SW	Engine switch on (IG) signal	OFF or ON	OFF: Engine switch off or on (ACC) ON: Engine switch on (IG)	-
RR Door Courtesy SW	Rear door courtesy light switch (for RH) signal	OFF or ON	OFF: Rear door RH closed ON: Rear door RH open	-
RL Door Courtesy SW	Rear door courtesy light switch (for LH) signal	OFF or ON	OFF: Rear door LH closed ON: Rear door LH open	-
Door Lock SW-Lock	Door control switch assembly lock signal	OFF or ON	OFF: Lock side of door control switch assembly not pushed ON: Lock side of door control switch assembly pushed	-
Door Lock SW-Unlock	Door control switch assembly unlock signal	OFF or ON	OFF: Unlock side of door control switch assembly not pushed ON: Unlock side of door control switch assembly pushed	-
Door Key SW-Lock	Driver door key-linked lock / unlock switch lock signal	OFF or ON	OFF: Driver door key cylinder not turned to lock position ON: Driver door key cylinder turned to lock position	-
D Door Key SW-UL	Driver door key-linked lock / unlock switch unlock signal	OFF or ON	OFF: Driver door key cylinder not turned to unlock position ON: Driver door key cylinder turned to unlock position	-
FR Door Lock Pos	Front door RH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door RH locked UNLOCK: Front door RH unlocked	-
FR Door Courtesy SW	Front door courtesy light switch (for RH) signal	OFF or ON	OFF: Front door RH closed ON: Front door RH open	-
FL Door Lock Pos	Front door LH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door LH locked UNLOCK: Front door LH unlocked	-
FL Door Courtesy SW	Front door courtesy light switch (for LH) signal	OFF or ON	OFF: Front door LH closed ON: Front door LH open	-
RR-Door Lock Pos SW	Rear door RH unlock detection switch signal	OFF or ON	OFF: Rear door RH locked ON: Rear door RH unlocked	-
RL-Door Lock Pos SW	Rear door LH unlock detection switch signal	OFF or ON	OFF: Rear door LH locked ON: Rear door LH unlocked	-
Unlock Key Twice	Key-linked 2-step unlock function	OFF or ON	Customize setting displayed	-
Automatic Door Lock Function	Automatic door lock function	OFF, Link Shift or Link Speed	Customize setting displayed	-
Automatic Door Unlock Function	Automatic door unlock function	OFF, Link D-door or Link Shift	Customize setting displayed	-
The Number of DTC	Number of trouble codes	0 to 255	Number of stored DTCs displayed	-

Body Electrical > Master Switch > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Door Lock Switch Status

Multiplex network master switch assembly lock signal

OFF or ON

OFF: Lock side of multiplex network master switch assembly not pushed

ON: Lock side of multiplex network master switch assembly pushed

Door Unlock Switch Status

Multiplex network master switch assembly unlock signal

OFF or ON

OFF: Unlock side of multiplex network master switch assembly not pushed

ON: Unlock side of multiplex network master switch assembly pushed

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Door Lock	Door lock motor	OFF/Unlock/Lock	-
D-Door Unlock	Driver door lock motor	OFF/ON	-
Shock Detection Unlock	Operate door lock motor	UNLOCK/LOCK	-

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Power Door Lock Control System (for Gasoline Model)

DTC No.	Detection Item	Link
B1243	GSW Terminal Circuit Malfunction

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

Body Electrical > Main Body > Trouble Codes

(e) Check the details of the DTCs.

Click here

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

Body Electrical > Main Body > Clear DTCs

(e) Clear the DTCs.

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the power door lock control system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS CHECK

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
The following 5 items are important points for problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency, whether the problem occurred recently or has been occurring for a long time
Where	Whether the problem occurs at a specific location
Under what conditions?	Whether the doors were locked or unlocked, whether the engine switch was on (IG), whether the engine has started.
How did it happen?	Problem symptoms

3.	READ AND SAVE OPERATION HISTORY

NOTICE:

If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
The operation history function uses the current system time of the Techstream and the time counter inside the controlling ECU to calculate the times shown in the operation history. For this reason, before reading the operation history, first make sure that the Techstream system clock is accurately set to the current time.

(a) Read and save operation history using the Techstream.

Click here

Body Electrical > Main Body > Utility

Tester Display
Operation History

PRE-CHECK

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

5.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check for CAN communication system DTCs.

Click here

Result	Proceed to
CAN DTCs are not output	A
CAN DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

6.	CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Using the Techstream, check for LIN communication system DTCs.

Click here

Result	Proceed to
LIN DTCs are not output	A
LIN DTCs are output	B

GO TO LIN COMMUNICATION SYSTEM

7.	CHECK FOR DTC (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)*

(a) Clear the DTCs.

Click here

Body Electrical > Master Switch > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Master Switch > Trouble Codes

Result	Proceed to
DTC B2312 is not output	A
DTC B2312 is output	B

GO TO POWER WINDOW CONTROL SYSTEM

8.	CHECK FOR DTC (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))*

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B1243 is not output	A
DTC B1243 is output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

9.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table (Fault can be simulated)	A
Fault is not listed in Problem Symptoms Table (Fault cannot be simulated)	B
Fault is listed in Problem Symptoms Table	C

CHECK FOR INTERMITTENT PROBLEMS

GO TO STEP 11

10.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Terminals of ECU

Click here

(b) Data List / Active Test

Click here

(d) Inspection

11.	REPAIR OR REPLACE

12.	CONFIRMATION TEST

END

Improper Operation

DESCRIPTION

In cases where the doors locked or unlocked by themselves even though a door lock or unlock operation was not performed, a vehicle malfunction, accidental operation by the customer or a passenger, or environmental factors should all be considered as a possible cause. By using the operation history, the possible causes of the malfunction can be narrowed down, enabling the problem to be solved by repair or replacement, or by explaining to the customer how environmental factors affect the operation.

CAUTION / NOTICE / HINT

NOTICE:

If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
The operation history function uses the current system time of the Techstream and the time counter inside the controlling ECU to calculate the times shown in the operation history. For this reason, before reading the operation history, first make sure that the Techstream system clock is accurately set to the current time.

PROCEDURE

1.	CONFIRM VEHICLE CONDITION

(a) Confirm the vehicle symptoms.

Result	Proceed to
Doors locked unintentionally	A
Doors unlocked unintentionally	B

GO TO STEP 5

2.	CHECK LOCK OPERATION HISTORY

(a) Use the Techstream to check the door lock operation history around the time the customer reported the malfunction to have occurred.

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Main Body / Utility / Operation History.

Body Electrical > Main Body > Utility

Tester Display
Operation History

(5) Read the Operation History according to the display on the Techstream.

(6) Check if there is operation history around the time that the customer reported the malfunction to have occurred, and perform an operation check.

Click here

Result	Proceed to
There is operation history around the time that the customer reported the malfunction to have occurred, but a malfunction could not be identified during the operation check.	A
There is operation history around the time that the customer reported the malfunction to have occurred, and the malfunction was identified during the operation check.	B
There is no operation history around the time that the customer reported the malfunction to have occurred.	C

END (VEHICLE MALFUNCTION)

GO TO STEP 4

3.	INTERVIEW THE CUSTOMER

(a) If the problem symptoms could not be reproduced, explain to the customer the details of the door lock operation history such as the signal timings of the multiplex network master switch assembly, key, etc.

Click here

OK:

Cause was identified

END

CHECK FOR INTERMITTENT PROBLEMS

4.	CHECK UNLOCK OPERATION HISTORY

(a) Use the Techstream to check the door unlock operation history around the time the customer reported the malfunction to have occurred.

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Main Body / Utility / Operation History.

Body Electrical > Main Body > Utility

Tester Display
Operation History

(5) Read the Operation History according to the display on the Techstream.

(6) Check if there is operation history around the time that the customer reported the malfunction to have occurred, and perform an operation check.

Click here

Result	Proceed to
There is no operation history around the time that the customer reported the malfunction to have occurred.	A
There is operation history around the time that the customer reported the malfunction to have occurred, but a malfunction could not be identified during the operation check.	A
There is operation history around the time that the customer reported the malfunction to have occurred, and the malfunction was identified during the operation check.	B

CHECK FOR INTERMITTENT PROBLEMS

END

5.	CHECK UNLOCK OPERATION HISTORY

(a) Use the Techstream to check the door unlock operation history around the time the customer reported the malfunction to have occurred.

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Main Body / Utility / Operation History.

Body Electrical > Main Body > Utility

Tester Display
Operation History

(5) Read the Operation History according to the display on the Techstream.

(6) Check if there is operation history around the time that the customer reported the malfunction to have occurred, and perform an operation check.

Click here

Result	Proceed to
There is operation history around the time that the customer reported the malfunction to have occurred, but a malfunction could not be identified during the operation check.	A
There is operation history around the time that the customer reported the malfunction to have occurred, and the malfunction was identified during the operation check.	B
There is no operation history around the time that the customer reported the malfunction to have occurred.	C

END

GO TO STEP 7

6.	INTERVIEW THE CUSTOMER

Click here

OK:

Cause was identified

END

CHECK FOR INTERMITTENT PROBLEMS

7.	CHECK LOCK OPERATION HISTORY

(a) Use the Techstream to check the door lock operation history around the time the customer reported the malfunction to have occurred.

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Main Body / Utility / Operation History.

Body Electrical > Main Body > Utility

Tester Display
Operation History

(5) Read the Operation History according to the display on the Techstream.

(6) Check if there is operation history around the time that the customer reported the malfunction to have occurred, and perform an operation check.

Click here

Result	Proceed to
There is no operation history around the time that the customer reported the malfunction to have occurred.	A
There is operation history around the time that the customer reported the malfunction to have occurred, but a malfunction could not be identified during the operation check.	A
There is operation history around the time that the customer reported the malfunction to have occurred, and the malfunction was identified during the operation check.	B

CHECK FOR INTERMITTENT PROBLEMS

END

Operation Check

OPERATION CHECK

CHECK CUSTOMIZE PARAMETERS

NOTICE:

The operation check below is based on the non-customized initial condition of the vehicle.

Click here

CHECK BASIC FUNCTIONS

(a) Check that all of the doors lock when the lock side of the door control switch is pressed.

(b) Check that all of the doors unlock when the unlock side of the door control switch is pressed.

(d) Check that only the driver door unlocks when the driver door lock cylinder is turned to unlock once using the key and all of the doors unlock when it is turned to unlock again.

CHECK THE KEY LOCK-IN PREVENTION FUNCTION

NOTICE:

In order to prevent the key from being locked in the vehicle, the following inspection should be performed with the driver door window open.

(a) Turn the engine switch on (IG) or on (ACC).

(b) With the driver door open, check that all of the doors unlock immediately after the door lock knob for the driver door is pressed.

(c) With the driver door open, check that all of the doors unlock immediately after the lock side of the door control switch is pressed.

(d) With the driver door open, press the driver door lock knob and hold it for 2 seconds or more, then close the driver door and check that all of the doors unlock.

CHECK THE SECURITY FUNCTION OF THE DOOR LOCK CONTROL SYSTEM

(a) Close all of the doors and leave the driver door window open so that the door control switch can be operated from outside the vehicle. (Step 1)

(b) Open the driver door and remove the key from the vehicle. With the door still open, lock the door using the door lock knob. Close the driver door. Then, check that the doors do not unlock when the unlock side of the door control switch is pressed from outside the vehicle.

(c) Starting from Step 1, with the key outside the vehicle, close and lock the driver door using the mechanical key. Then, check that the doors do not unlock when the unlock side of the door control switch is pressed from outside the vehicle.

(d) Starting from Step 1, with the key outside the vehicle, close and lock the driver door using wireless key operation or smart key operation. Then, check that the doors do not unlock when the unlock side of the door control switch is pressed from outside the vehicle.

HINT:

Check that the security function of the door lock control system is canceled under the following conditions:

The engine switch is turned on (IG).
The driver door is unlocked using the key.
The unlock switch of the door control switch is pressed after the door lock knob is unlocked manually.
The doors are unlocked by wireless operation.
The doors are unlocked by entry operation.

CHECK THE KEY-LINKED 2-STEP UNLOCK FUNCTION

HINT:

The key-linked 2-step unlock function can be customized. Make sure that function is ON before this procedure.

Click here

(a) Lock all doors.

(b) Check that only the driver door unlocks when the driver door lock cylinder is turned to unlock once using the key and all of the doors unlock when it is turned to unlock again.

CHECK THE SHIFT LINKED AUTOMATIC DOOR LOCK FUNCTION

HINT:

The shift linked automatic door lock function can be customized. Make sure that function is ON before this procedure.

Click here

(a) With the shift lever in P and the engine switch on (IG), check that all doors lock automatically when the shift lever is moved to any position other than P.

CHECK THE SPEED-SENSITIVE AUTOMATIC DOOR LOCK FUNCTION

HINT:

The speed-sensitive automatic door lock function can be customized. Make sure that function is ON before this procedure.

Click here

(a) When any door is unlocked and the vehicle is driven at approximately 20 km/h (12 mph) or more, check that all of the doors lock automatically.

CHECK THE SHIFT LINKED AUTOMATIC DOOR UNLOCK FUNCTION

HINT:

The shift linked automatic door unlock function can be customized. Make sure that function is ON before this procedure.

Click here

(a) With the shift lever in any position other than P and the engine switch on (IG), check that all doors unlock automatically when the shift lever is moved to P.

CHECK THE DRIVER DOOR-LINKED AUTOMATIC DOOR UNLOCK FUNCTION

HINT:

The driver door-linked automatic door unlock function can be customized. Make sure that function is ON before this procedure.

Click here

(a) When the driver door is closed, turning the engine switch from on (IG) to off and opening the driver door within approximately 43 seconds will automatically unlock all doors.

Parts Location

PARTS LOCATION

ILLUSTRATION

*A	for Toyota Entune Remote Connect Compatible Type	-	-
*1	DOOR CONTROL SWITCH ASSEMBLY	*2	DLC3
*3	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	*4	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-IG1 NO. 4 FUSE - ECU-ACC FUSE - ECU-DCC NO. 2 FUSE - ALL DR LOCK RELAY - L/D-DR UNLOCK RELAY - D-DR UNLOCK RELAY
*5	MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - DOOR CONTROL SWITCH	*6	DCM (TELEMATICS TRANSCEIVER)
*7	AIRBAG ECU ASSEMBLY	-	-

ILLUSTRATION

*1	FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)	*2	FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)
*3	FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH	*4	FRONT DOOR LOCK WITH MOTOR ASSEMBLY RH
*5	REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)	*6	REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)
*7	REAR DOOR LOCK WITH MOTOR ASSEMBLY LH	*8	REAR DOOR LOCK WITH MOTOR ASSEMBLY RH
*9	DOOR KEY LOCK AND UNLOCK SWITCH	*10	DOOR LOCK MOTOR
*11	DOOR UNLOCK DETECTION SWITCH	-	-

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

System Name	See Procedure
Lane Departure Alert System (w/ Steering Control)
Intelligent Clearance Sonar System
Parking Assist Monitor System
Panoramic View Monitor System
Pre-collision System
Lighting System (for Gasoline Model with Cornering Light)

PRECAUTION FOR REGISTRATION

(a) Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Power Door Lock Control System

Symptom	Suspected Area	Link
Only driver door LOCK functions do not operate	Front door lock with motor assembly LH
	Wire harness or connector	-
	Instrument panel junction block assembly	-
Only driver door UNLOCK functions do not operate	Front door lock with motor assembly LH
	Wire harness or connector	-
	Main body ECU (Multiplex network body ECU)	-
	Instrument panel junction block assembly	-
Only front passenger door LOCK/UNLOCK functions do not operate	Front door lock with motor assembly RH
	Wire harness or connector	-
	Instrument panel junction block assembly	-
Only rear door LH LOCK/UNLOCK functions do not operate.	Rear door lock with motor assembly LH
	Wire harness or connector	-
	Instrument panel junction block assembly	-
Only rear door RH LOCK/UNLOCK functions do not operate.	Rear door lock with motor assembly RH
	Wire harness or connector	-
	Instrument panel junction block assembly	-
All doors LOCK/UNLOCK functions do not operate via door key cylinder	Main body ECU (Multiplex network body ECU)
	Front door lock with motor assembly LH
	Wire harness or connector
All doors LOCK/UNLOCK functions do not operate via master switch	Lin communication system
	Multiplex network master switch assembly
	Main body ECU (Multiplex network body ECU)
All doors LOCK/UNLOCK functions do not operate via door control switch	Main body ECU (Multiplex network body ECU)
	Door control switch assembly
	Wire harness or connector
	Instrument panel junction block assembly
All doors LOCK/UNLOCK functions do not operate via multiplex network master switch assembly and door key cylinder.	Instrument panel junction block assembly	-
	Main body ECU (Multiplex network body ECU)	-
Speed-sensitive automatic door lock function does not operate (meter/gauge system operates normally).	CAN communication system
	Main body ECU (Multiplex network body ECU)
Shift-linked automatic door lock/unlock functions do not operate (automatic transaxle system operates normally).	CAN communication system
	Main body ECU (Multiplex network body ECU)
	ECM
Key lock-in prevention function does not operate	Instrument panel junction block assembly
	Main body ECU (Multiplex network body ECU)
	Wire harness or connector	-
Lock operation continues even after doors have been locked*1	Front door lock with motor assembly LH
	Front door lock with motor assembly RH
	Rear door lock with motor assembly LH
	Rear door lock with motor assembly RH
	Wire harness or connector	-
	Instrument panel junction block assembly	-
	Main body ECU (Multiplex network body ECU)	-
Remote door lock functions do not operate*2	Telematics system
When returning to the vehicle, although door unlock operation was not performed, doors were in an unlocked state.	Main body ECU (Multiplex network body ECU)
When returning to the vehicle, although door unlock operation was not performed, doors were in an unlocked state.	Main body ECU (Multiplex network body ECU)

HINT:

*1: When the door unlock detection switch detects an unlock position signal after a door lock operation has been performed, a door lock operation will be performed 3 times.
*2: for Toyota Entune Remote Connect Compatible Type

System Diagram

SYSTEM DIAGRAM

Terminals Of Ecu

TERMINALS OF ECU

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Measure the resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connectors connected.

Terminal No. (Symbol)	Wiring Color	Input/Output	Terminal Description	Condition	Specified Condition	Related Data List Item
G32-19 (GND2) - Body ground	W-B - Body ground	-	Ground	Always	Below 1 Ω	-

(d) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Input/Output	Terminal Description	Condition	Specified Condition	Related Data List Item
MB-11 (GND1) - Body ground	-	-	Ground	Always	Below 1 Ω	-
MB-30 (ACC) - Body ground	-	Input	ACC power supply	Engine switch on (ACC)	11 to 14 V	ACC SW
MB-30 (ACC) - Body ground	-	Input	ACC power supply	Engine switch off	Below 1 V	ACC SW
MB-31 (BECU) - Body ground	-	Input	Battery power supply	Always	11 to 14 V	-
MB-32 (IG) - Body ground	-	Input	IG power supply	Engine switch on (IG)	11 to 14 V	IG SW
MB-32 (IG) - Body ground	-	Input	IG power supply	Engine switch off	Below 1 V	IG SW

(e) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

Click here

(f) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Input/Output	Terminal Description	Condition	Specified Condition	Related Data List Item
G33-1 (FLCY) - Body ground	W- Body ground	Input	Front door courtesy light switch (for LH) input	Front door LH open → closed	Below 1 V → 11 to 14 V	FL Door Courtesy SW
G33-6 (FRCY) - Body ground	BE - Body ground	Input	Front door courtesy light switch (for RH) input	Front door RH open → closed	Below 1 V → 11 to 14 V	FR Door Courtesy SW
4H-24 (LCTY) - Body ground	G - Body ground	Input	Rear door courtesy light switch (for LH) input	Rear door LH open → closed	Below 1 V → 11 to 14 V	RL Door Courtesy SW
4A-31 (RCTY) - Body ground	V - Body ground	Input	Rear door courtesy light switch (for RH) input	Rear door RH open → closed	Below 1 V → 11 to 14 V	RR Door Courtesy SW
4D-13 (LSFL) - Body ground	W - Body ground	Input	Front door LH unlock detection switch input	Front door LH unlocked → locked	Below 1 V → 11 to 14 V	FL Door Lock Pos SW
4D-12 (LSFR) - Body ground	GR - Body ground	Input	Front door RH unlock detection switch input	Front door RH unlocked → locked	Below 1 V → 11 to 14 V	FR Door Lock Pos SW
4D-14 (LSWL) - Body ground	GR - Body ground	Input	Rear door LH unlock detection switch input	Rear door LH unlocked → locked	Below 1 V → 11 to 14 V	RL-Door Lock Pos SW
G32-20 (LSWR) - Body ground	L - Body ground	Input	Rear door RH unlock detection switch input	Rear door RH unlocked → locked	Below 1 V → 11 to 14 V	RR-Door Lock Pos SW
4H-8 (ACT-) - Body ground	LA-R - Body ground	Output	Door lock motor unlock drive output	Door control switch or driver door key cylinder off → on (unlock)	Below 1 V → 11 to 14 V → Below 1 V	-
4H-9 (ACT-) - Body ground	R - Body ground	Output	Door lock motor unlock drive output	Door control switch or driver door key cylinder off → on (unlock)	Below 1 V → 11 to 14 V → Below 1 V	-
4H-6 (ACT+) - Body ground	LA-B - Body ground	Output	Door lock motor lock drive output	Door control switch or driver door key cylinder off → on (lock)	Below 1 V → 11 to 14 V → Below 1 V	-
4H-18 (ACT+) - Body ground	LA-B - Body ground	Output	Door lock motor lock drive output	Door control switch or driver door key cylinder off → on (lock)	Below 1 V → 11 to 14 V → Below 1 V	-
4D-4 (ACTD) - Body ground	LA-L - Body ground	Output	Door lock motor unlock drive output	Door control switch or driver door key cylinder off → on (unlock)	Below 1 V → 11 to 14 V → Below 1 V	-
4D-16 (L1) - Body ground	LG - Body ground	Output	Door control switch assembly input	Door control switch assembly off → on (lock)	Pulse generation → Below 1 V	Door Lock SW-Lock
4A-39 (UL1) - Body ground	GR - Body ground	Input	Door control switch assembly input	Door control switch assembly off → on (unlock)	Pulse generation → Below 1 V	Door Lock SW-Unlock
G34-17 (UL3) - Body ground	BE - Body ground	Input	Driver door key-linked unlock input	Driver door key cylinder in neutral position → on (unlock)	11 to 14 V → Below 1 V	D Door Key SW-UL
G34-18 (L2) - Body ground	LG - Body ground	Input	Driver door key-linked lock input	Driver door key cylinder in neutral position → on (lock)	11 to 14 V → Below 1 V	Door Key SW-Lock
4A-7 (GSW) - Body ground	B - Body ground	Input	Airbag sensor signal (collision detection signal)	Engine switch on (IG) with airbag ECU assembly connector disconnected	4.3 to 5.5 V	-

CHECK AIRBAG ECU ASSEMBLY

Click here

Luggage Compartment Door Lock

Rear Door Lock

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