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 (Marking: FR FOG) when a signal is received from the headlight dimmer switch.

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 (Main Body ECU)





OK:

Front fog light comes on.

OK -- CHECK WIRE HARNESS (DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND)
NG -- Continue to next step.

2. CHECK TAILLIGHT

(a) Check that the taillight comes on when the light control switch is on (TAIL).

OK:

Taillight comes on.

NG -- GO TO TAILLIGHT RELAY CIRCUIT
OK -- Continue to next step.

3. INSPECT FUSE (FR FOG)

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

(b) Measure the resistance of the fuses.

Standard resistance:

Below 1 Ohms

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

4. INSPECT FOG LIGHT BULB





(a) Remove the fog light bulb.

(b) Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the bulb illuminates.

OK:

Bulb illuminates.

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

5. INSPECT FRONT FOG LIGHT RELAY (Marking: FR FOG)





(a) Remove the front fog light relay from the No. 6 relay block.

(b) Measure the resistance of the relay.

Standard resistance:





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

6. CHECK WIRE HARNESS (BATTERY - MAIN BODY ECU)





(a) Disconnect the E17 ECU connector.

(b) Measure the voltage of the wire harness side connector.

Standard voltage:





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

7. CHECK WIRE HARNESS (FRONT FOG LIGHT RELAY - BATTERY)





(a) Remove the front fog light relay from the No. 6 relay block.

(b) Measure the voltage of the relay block.

standard voltage:





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

8. CHECK WIRE HARNESS (FRONT FOG LIGHT RELAY - FRONT FOG LIGHT AND BODY GROUND)





(a) Remove the front fog light relay from the No. 6 relay block.

(b) Disconnect the A11 and A28 front fog light connectors.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

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

9. CHECK WIRE HARNESS (DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND)





(a) Disconnect the E12 headlight dimmer switch connector.

(b) Disconnect the E17 main body ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





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

10. INSPECT FOG LIGHT SWITCH





(a) Remove the headlight dimmer switch.

(b) Measure the resistance of the switch.

Standard resistance:





NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - BODY GROUND)