Front Fog Light Circuit

LIGHTING: LIGHTING SYSTEM: Front Fog Light Circuit
- Front Fog Light Circuit

DESCRIPTION

The main body ECU controls the fog light relay when a signal is received from the headlight dimmer switch assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Check the operation.

Main Body:





OK:

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

NG -- INSPECT FUSE (FR FOG)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

2. INSPECT FUSE (FR FOG)

(a) Remove the FR FOG fuse from the instrument panel junction block.

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

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT FOG LIGHT RELAY (FOG)

(a) Remove the fog light relay from the instrument panel junction block.





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

Standard resistance:





NG -- REPLACE FOG LIGHT RELAY
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (BATTERY - FOG LIGHT RELAY)

(a) Remove the fog light relay from the instrument panel junction block.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (FOG LIGHT RELAY - MAIN BODY ECU)

(a) Remove the fog light relay from the instrument panel junction block.





(b) Disconnect the D8 main body ECU connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

(a) Remove the main body ECU with its connectors still connected.





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

Standard voltage:





NG -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FOG LIGHT RELAY - BODY GROUND)