Front Fog Light Circuit

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

DESCRIPTION

The main body ECU controls the front 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 Techstream to the DLC3.

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

(c) Turn Techstream on.

(d) Select the following menu items: Body Electrical / Main Body / Active Test.

(e) Check that the relay operates.

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 front 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 - FRONT FOG LIGHT RELAY)

(a) 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 (FRONT FOG LIGHT RELAY - MAIN BODY ECU)

(a) Disconnect the D8 main body ECU connector.





(b) 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. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

(a) Reconnect the D8 main body ECU connector.





(b) Install the front fog light relay to the instrument panel junction block.

(c) 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 (FRONT FOG LIGHT RELAY - BODY GROUND)