Toyota Avalon Service & Repair Manual: Improper Operation

DESCRIPTION

If the alarm function of the theft deterrent system operates unintentionally, one of the following may be the cause.

  • Short to ground in any door courtesy light switch circuit or the engine hood courtesy switch (hood lock assembly) circuit.
  • Unstable main body ECU (multiplex network body ECU) power source voltage.

HINT:

Preconditions for arming preparation:

  • Make sure the engine switch is off, all the doors and the hood are closed and all the doors have been locked by wireless operation or entry operation.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here

  • The theft deterrent system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the theft deterrent system after confirming that the communication system is functioning properly.

    Click here

  • The following troubleshooting procedure is based on the assumption that systems related to the theft deterrent system are normal. Confirm that the systems related to the theft deterrent system are not malfunctioning before performing the following procedure.

    Click here

  • 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.

CHECK THEFT DETERRENT SYSTEM OPERATION HISTORY

(a) Use the Techstream to check the theft deterrent system operation history around the time the customer reported the malfunction to have occurred.

Click here

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

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

B

GO TO STEP 7

C

END

A

2.

CHECK SECURITY INDICATOR LIGHT OPERATION

(a) Check that the security indicator light is illuminated when the theft deterrent system is in the arming preparation state.

Click here

(b) Check that the security indicator light blinks when the theft deterrent system is in the arming state.

Click here

State of Theft Deterrent System

Contents

Security Indicator Light Condition

Disarmed state (1), (2)

Theft deterrent system is unset.

  • Off (Immobiliser system unset)
  • Blinking (Immobiliser system set)

Arming preparation state

Standby period after theft deterrent system set conditions are met but before theft deterrent system is actually set (approximately 30 seconds).

(Theft detection not possible)

On

Armed state

Theft deterrent system is set.

(Theft detection is possible)

Blinking (Immobiliser system set)

Alarm sounding state

Theft attempt is detected, and alarm operates using turn signal lights, security horn assembly and vehicle horns.

(Alarm sounds for 57 seconds)

On

NG

GO TO OTHER PROBLEM

OK

3.

READ VALUE USING TECHSTREAM (Hood Courtesy SW)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(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

Hood Courtesy SW

Engine hood courtesy switch

OFF or ON

OFF: Engine hood closed

ON: Engine hood open

-

Body Electrical > Main Body > Data List

Tester Display

Hood Courtesy SW

OK:

The Techstream display changes correctly in response to the engine hood courtesy switch (hood lock assembly) status.

NG

GO TO STEP 5

OK

4.

INTERVIEW THE CUSTOMER

(a) If the problem symptoms could not be reproduced, explain to the customer the details of the operation history, such as the input signal timings of the key, etc.

Click here

OK:

Cause was identified

OK

END

NG

CHECK FOR INTERMITTENT PROBLEMS

5.

INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY)

(a) Remove the hood lock assembly.

Click here

(b) Inspect the engine hood courtesy switch (hood lock assembly).

Click here

NG

REPLACE HOOD LOCK ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the A12 engine hood courtesy switch (hood lock assembly) connector.

(b) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G33-30 (HCTY) - A12-2 (+)

Always

Below 1 Ω

G33-30 (HCTY) or A12-2 (+) - Other terminals and body ground

Always

10 kΩ or higher

A12-1 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INTERVIEW THE CUSTOMER

(a) If the problem symptoms could not be reproduced, explain to the customer the details of the operation history, such as the input signal timings of the key, etc.

Click here

OK:

Cause was identified

OK

END

NG

CHECK FOR INTERMITTENT PROBLEMS

    How To Proceed With Troubleshooting

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