Toyota 4Runner: How To Proceed With Troubleshooting

Toyota 4Runner Service Manual / Vehicle Exterior / Window / Glass / Window Defogger System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Inspect the window defogger system after confirming that the back door power window system of the power window control system is operating normally.
Use these procedures to troubleshoot the window defogger system.
*: Use the Techstream.

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) Check if the CAN communication system is functioning normally (See page ).

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) Check if the LIN communication system is functioning normally.

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

GO TO LIN COMMUNICATION SYSTEM

5.	PROBLEM SYMPTOMS TABLE

(a) Refer to the 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 7

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Terminals of ECU (See page ).

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

7.	REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

System Diagram

SYSTEM DIAGRAM Communication Table Transmitter Receiver Signal Line Heater control assembly Air conditioning amplifier assemb ...

OPERATION CHECK 1. CHECK WINDOW DEFOGGER SYSTEM OPERATION (a) When the ignition switch is turned to ON and the heater control (window defogger switch) is pressed, check that the window defogger op ...

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Toyota 4Runner: How To Proceed With Troubleshooting

System Diagram

Operation Check

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