Front Fog Light Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Front Fog Light Circuit
- Front Fog Light Circuit

DESCRIPTION

The main body ECU receives a front fog light switch information signal from the light control switch (front fog switch), and illuminates the front fog lights.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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

(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 / Front Fog Light.

(e) Check that the front fog lights turn on/off.

Main Body





OK:

Front fog lights turn on/off.

NG -- INSPECT FUSE (FOG)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System

2. INSPECT FUSE (FOG)

(a) Remove the FOG fuse from the engine room relay block.





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

Standard Resistance:





(c) Reinstall the FOG fuse.

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

3. INSPECT FOG LIGHT BULB

(a) Temporarily replace the front fog light bulb with a new or normally functioning one Disassembly.

(b) Check that the front fog light turn on.

OK:

front fog light turn on.

NG -- CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT BULB - BATTERY)

OK -- END

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





(a) for LH:

(1) Disconnect the A36 front fog light LH connector.

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

Standard Voltage:





(3) Reconnect the front fog light LH connector.

(b) for RH:

(1) Disconnect the A37 front fog light RH connector.

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

Standard Voltage:





(3) Reconnect the front fog light RH connector.

NG -- INSPECT FOG LIGHT RELAY (FOG)

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

5. INSPECT FOG LIGHT RELAY (FOG)





(a) Remove the FOG relay from the engine room relay block.

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

Standard Resistance:





(c) Reinstall the FOG relay.

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

6. CHECK HARNESS AND CONNECTOR (FOG RELAY - BATTERY, TAIL RELAY)





(a) Remove the FOG relay from the engine room relay block.

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

Standard Voltage:





(c) Reinstall the FOG relay.

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

7. CHECK HARNESS AND CONNECTOR (FOG RELAY - FRONT FOG LIGHT BULB)

(a) Remove the FOG relay from the engine room relay block.





(b) for LH:

(1) Disconnect the A36 front fog light LH connector.

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

Standard Resistance:





(3) Reconnect the front fog light LH connector.

(c) for RH:

(1) Disconnect the A37 front fog light RH connector.

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

Standard Resistance:





(3) Reconnect the front fog light RH connector.

(d) Reinstall the FOG relay.

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

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





(a) Disconnect the H4 main body ECU connector.

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

Standard Voltage:





(c) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU