Toyota 4Runner: How To Proceed With Troubleshooting

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use these procedures to troubleshoot the theft deterrent system.
*: Use the Techstream.
The troubleshooting procedures for the theft deterrent system are based on the premise that the door lock control system, wireless door lock control system, lighting system, horn system, engine immobiliser system and smart key system (w/ Smart Key System) are operating normally. Check these systems first before troubleshooting the theft deterrent system.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

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

3.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the CAN communication system is functioning normally.

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

GO TO CAN COMMUNICATION SYSTEM

4.	CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) The theft deterrent system uses the LIN communication system to communicate. Check that the LIN communication system is functioning normally.

Result	Proceed to
LIN communication system is normal	A
LIN communication system is malfunctioning	B

GO TO LIN COMMUNICATION SYSTEM

5.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table (See page ).

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

GO TO STEP 8

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Data List / Active Test (See page ).

(b) Terminals of ECU (See page ).

7.	REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

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 lis ...

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Toyota 4Runner: How To Proceed With Troubleshooting

System Diagram

Problem Symptoms Table

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