Front Fog Light Circuit

LIGHTING: LIGHTING SYSTEM: Front Fog Light Circuit

Front Fog Light Circuit

DESCRIPTION

When all of the following conditions are met, the front fog lights come on.

- Low beam headlights are ON.
- Front fog light switch is ON.
- High beam headlights are OFF.

When any of the following conditions is met, the front fog lights turn off.

- Front fog light switch is OFF.
- Low beam headlights are OFF.
- High beam headlights are ON.
HINT:
- Before performing troubleshooting of the front fog light system, check that the taillight system and headlight system are normal.
- If only a front fog light on one side does not illuminate, inspect the bulb or wire harness that is related to the bulb.
- If both right and left front fog lights do not illuminate, read the front fog light switch value in the data list and perform the front fog light relay active test to determine if the malfunction exists on either the switch side or the relay side.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the engine 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.)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
2. INSPECT FUSE (FR FOG)
(a) Remove the FR FOG fuse from the instrument panel J/B assembly.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT FOG LIGHT RELAY




(a) Remove the front fog light relay from the instrument panel junction block assembly.
(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. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY




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






OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - BODY GROUND)
NG -- Continue to next step.
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY




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






NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (BETWEEN CONNECTOR DL-3 AND CONNECTOR DL-4)




(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.
7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY




(a) Disconnect the DI instrument panel assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (BODY ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)




(a) Disconnect the E61 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 -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY