Toyota Avalon (XX50): Zero Point Calibration of Deceleration Sensor undone (C1336). Stop Light Relay Malfunction (C1380). IG1 Voltage Supply too High (C1417)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Gasoline Model) / Zero Point Calibration of Deceleration Sensor undone (C1336). Stop Light Relay Malfunction (C1380). IG1 Voltage Supply too High (C1417)

Zero Point Calibration of Deceleration Sensor undone (C1336)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2). If a communication error with the yaw rate and acceleration sensor (airbag sensor assembly) is detected, DTCs U0123 (Lost Communication With Yaw Rate Sensor Module) and U0151 (Lost Communication With Restraints Control Module) are stored.

The DTCs are also stored when the calibration has not been completed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1336	Zero Point Calibration of Deceleration Sensor undone	Zero point calibration of acceleration sensor undone.	Acceleration sensor (airbag sensor assembly) installation Acceleration sensor (airbag sensor assembly) Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here
After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here

HINT:

When U0123 and/or U0151 is output together with C1336, inspect and repair the trouble areas indicated by U0123 and/or U0151 first.

Click here

PROCEDURE

1.	PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Test Mode.

(b) Perform zero point calibration of the yaw rate and acceleration sensor.

Click here

Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display
Test Mode

2.	PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

(a) Turn the engine switch off.

(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.

(c) Using the Techstream, perform a Test Mode (Signal Check) inspection sensor check and check that all Test Mode (Signal Check) inspection items change from incomplete to complete.

Click here

Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display
Signal Check

OK:

All Test Mode (Signal Check) inspection items change from incomplete to complete

END

3.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the engine switch off.

(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

Click here

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

4.	READ VALUE USING TECHSTREAM (ACCELERATION SENSOR)

(a) Connect the Techstream to the DLC3.

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

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Deceleration Sensor	Acceleration sensor reading	Min.: -18.525 m/s2 Max.: 18.387 m/s2	-	During deceleration/acceleration: Changes continuously
Deceleration Sensor2	Acceleration sensor 2 reading	Min.: -18.525 m/s2 Max.: 18.387 m/s2	-	During deceleration/acceleration: Changes continuously

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Deceleration Sensor

Acceleration sensor reading

Min.: -18.525 m/s2

Max.: 18.387 m/s2

During deceleration/acceleration: Changes continuously

Deceleration Sensor2

Acceleration sensor 2 reading

Min.: -18.525 m/s2

Max.: 18.387 m/s2

During deceleration/acceleration: Changes continuously

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display
Deceleration Sensor
Deceleration Sensor2

(d) Check the yaw rate and acceleration sensor (airbag sensor assembly) output value displayed on the Techstream.

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) output value is normal.

REPLACE BRAKE ACTUATOR ASSEMBLY

REPLACE AIRBAG SENSOR ASSEMBLY

Stop Light Relay Malfunction (C1380)

DESCRIPTION

When the skid control ECU (brake actuator assembly) applies the brakes after receiving a brake request signal from the pre-collision system, dynamic radar cruise control system, secondary collision brake system or brake hold control system, the skid control ECU (brake actuator assembly) operates the stop light control relay (stop light switch assembly) to illuminate the stop lights.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1380	Stop Light Relay Malfunction	Either condition is met: When the voltage at the +BS terminal is between 10 V or more and the stop light control relay (stop light switch assembly) drive output (STPO) is on, a signal is not input to the STP terminal for 5 seconds or more. When the voltage at the +BS terminal is between 10 V or more and the stop light control relay (stop light switch assembly) drive output (STPO) is off, the signal at the STP2 terminal is different from the input signal at the STP terminal for 5 seconds or more.	Wire harness or connector Stop light switch assembly Skid control ECU (brake actuator assembly) Rear combination light assembly LH Rear light assembly LH* Rear combination light assembly RH Rear light assembly RH* Center stop light set Shift lock control ECU (shift lock control unit assembly) Certification ECU (smart key ECU assembly) ECM

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1380

Stop Light Relay Malfunction

Either condition is met:

When the voltage at the +BS terminal is between 10 V or more and the stop light control relay (stop light switch assembly) drive output (STPO) is on, a signal is not input to the STP terminal for 5 seconds or more.
When the voltage at the +BS terminal is between 10 V or more and the stop light control relay (stop light switch assembly) drive output (STPO) is off, the signal at the STP2 terminal is different from the input signal at the STP terminal for 5 seconds or more.

Wire harness or connector
Stop light switch assembly
Skid control ECU (brake actuator assembly)
Rear combination light assembly LH
Rear light assembly LH*
Rear combination light assembly RH
Rear light assembly RH*
Center stop light set
Shift lock control ECU (shift lock control unit assembly)
Certification ECU (smart key ECU assembly)
ECM

*: w/ Cornering Light

DTC Detection Conditions: C1380

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	The voltage at the +BS terminal is between 10 V or more.	○	○
Malfunction Status	When the stop light control relay (stop light switch assembly) drive output (STPO) is on, a signal is not input to the STP terminal.	○	-
Malfunction Status	When the stop light control relay (stop light switch assembly) drive output (STPO) is off, the signal at the STP2 terminal is different from the input signal at the STP terminal.	-	○
Detection Time		5 seconds or more	5 seconds or more
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (BS1 VOLTAGE VALUE)

(a) Connect the Techstream to the DLC3.

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

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
BS1 Voltage Value	+BS voltage value	Min.: 0.00 V, Max.: 20.00 V	-	Changes in proportion to battery voltage

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display
BS1 Voltage Value

(d) Take a note of the +BS voltage value.

HINT:

The noted +BS voltage value is used in a later step.

2.	CHECK HARNESS AND CONNECTOR (STP2, STPO AND STP TERMINAL)

(a) Turn the engine switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-42 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-42 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V
A28-10 (STPO) - Body ground	Always	11 to 14 V
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

Result	Proceed to
All terminal voltages are normal	A
Only STP terminal voltage abnormal	B
Only STPO terminal voltage abnormal	C
Only STP2 terminal voltage abnormal	D
STPO terminal and STP2 terminal voltage abnormal	E

GO TO STEP 6

GO TO STEP 11

GO TO STEP 12

GO TO STEP 22

3.	PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)

(a) Reconnect the A28 skid control ECU (brake actuator assembly) connector.

(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Stop Light Relay	Stop light control relay (Stop light switch assembly)	Relay OFF/ON	Stop lights come on

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display
Stop Light Relay

OK:

Stop light turns ON/OFF in response to the Techstream operation

GO TO STEP 5

4.	CHECK FOR DTC

(a) Clear the DTCs.

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Stop Light Relay	Stop light control relay (Stop light switch assembly)	Relay OFF/ON	Stop lights come on

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display
Stop Light Relay

(d) Check if the same DTC is output.

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
C1380 is output	A
C1380 is not output	B

REPLACE BRAKE ACTUATOR ASSEMBLY

USE SIMULATION METHOD TO CHECK

5.	INSPECT BRAKE ACTUATOR ASSEMBLY

(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Stop Light Relay	Stop light control relay (Stop light switch assembly)	Relay OFF/ON	Stop lights come on

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display
Stop Light Relay

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A33-4 (ACC) - Body ground	Active Test is on	Below 1.5 V

*a	Component with harness connected (Stop Light Switch Assembly)

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPLACE BRAKE ACTUATOR ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SMART KEY ECU ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the K10 certification ECU (smart key ECU assembly) connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-42 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-42 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE SMART KEY ECU ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A18 ECM connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-42 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-42 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE ECM

8.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the G21 shift lock control ECU (shift lock control unit assembly) connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-42 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-42 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY

9.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A33 stop light switch assembly connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-42 (STP) - Body ground	Always	Below 1.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-42 (STP) - A33-3 (L)	Always	Below 1 Ω
A28-42 (STP) or A33-3 (L) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

(b) Disconnect the A33 stop light switch assembly connector.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-10 (STPO) - A33-4 (ACC)	Always	Below 1 Ω

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the P10 rear combination light assembly LH connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

13.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the P9 rear combination light assembly RH connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

Result	Proceed to
OK	A
NG (w/o Cornering Light)	B
NG (w/ Cornering Light)	C

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

GO TO STEP 17

14.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - CENTER STOP LIGHT SET)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the K41 center stop light set connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE CENTER STOP LIGHT SET

15.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A33 stop light switch assembly connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Always	Below 1.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A33-1 (OUT) - A28-44 (STP2)	Always	Below 1 Ω
A33-1 (OUT) or A28-44 (STP2) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR LIGHT ASSEMBLY LH)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the P12 rear light assembly LH connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE REAR LIGHT ASSEMBLY LH

18.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR LIGHT ASSEMBLY RH)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the P11 rear light assembly RH connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE REAR LIGHT ASSEMBLY RH

19.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - CENTER STOP LIGHT SET)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the K41 center stop light set connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	(+BS x 0.85) to 14 V*
A28-44 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

REPLACE CENTER STOP LIGHT SET

20.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A33 stop light switch assembly connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-44 (STP2) - Body ground	Always	Below 1.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A33-1 (OUT) - A28-44 (STP2)	Always	Below 1 Ω
A33-1 (OUT) or A28-44 (STP2) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.	CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Stop Light Switch Assembly)

(b) Disconnect the A33 stop light switch assembly connector.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A33-2 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A33-7 (B) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-10 (STPO) or A33-4 (ACC) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

IG1 Voltage Supply too High (C1417)

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.

This DTC is stored when the +BS terminal voltage deviates due to a malfunction in a power supply or charging system circuit such as the battery or alternator circuit, etc.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1417	IG1 Voltage Supply too High	+BS terminal voltage is more than 16.5 V for 1 second or more.	Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C1241.

Click here

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK BATTERY

(a) Check the battery voltage.

Standard Voltage:

Tester Connection	Condition	Specified Condition
Positive (+) terminal - Negative (-) terminal	Engine switch off	11 to 14 V

CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-30 (+BS) - Body ground	Always	11 to 14 V
A28-30 (+BS) - A28-46 (GND1)	Always	11 to 14 V
A28-36 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V
A28-36 (IG1) - A28-46 (GND1)	Engine switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

3.	RECONFIRM DTC

(a) Turn the engine switch off.

(b) Reconnect the A28 skid control ECU (brake actuator assembly) connector.

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(d) Turn the engine switch off.

(e) Start the engine.

(f) Perform a road test.

(g) Check if the same DTC is output.

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
C1417 is not output	A
C1417 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

Error in Matching of ECUs (C1288). Skid Control ECU Malfunction (C1300). Open Circuit in Right Front Speed Sensor Circuit (C1330-C1467)

Deceleration Sensor Internal Circuit (C1419,C1435). Malfunction in Deceleration Sensor (C1420). Open in Stop Light Switch Circuit (C1425)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Fuel Rail / System Pressure - Too Low (P008700)
DESCRIPTION The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor, fuel pump assembly (for high pressure side) and fuel injector assemblies (for direct injection). The spill control valve adjusts the return volume of hi ...