Toyota 4Runner: Front Fog Light Circuit

Toyota 4Runner Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / Front Fog Light Circuit

DESCRIPTION

The main body ECU receives headlight dimmer switch information signals, and illuminates the front fog light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (FRONT FOG LIGHT RELAY)

(a) Using the Techstream, perform the Active Test (See page ).

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Front Fog Light Relay	Front fog light relay	ON/OFF	-

OK:

Front fog light relay operates (front fog lights come on).

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
2D-9 - Body ground	Headlight dimmer switch in tail and front fog light switch on	11 to 14 V

Text in Illustration

*a	Component with harness connected (Driver Side Junction Block Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - FOG LIGHT ASSEMBLY)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Headlight (HI-BEAM) Circuit

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Taillight Relay Circuit

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Other materials about Toyota 4Runner:

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 ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST 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. HINT: Using the T ...