Rear Fog Light Circuit

LIGHTING: LIGHTING SYSTEM: Rear Fog Light Circuit
- Rear Fog Light Circuit

DESCRIPTION

The multiplex network rear ECU receives rear fog light switch information from the combination switch, and turns on the rear fog lights.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Select the item below in the Active Test, use the Techstream to generate a control command, and then check that the rear fog light illuminates.

Multiplex network rear ECU:





OK:

Rear fog light illuminates.

NG -- INSPECT FUSE (RR FOG)

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

2. INSPECT FUSE (RR FOG)

(a) Remove the RR FOG fuse from the No. 1 junction block.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

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

3. REPLACE REAR LIGHT BULB (REAR FOG LH OR REAR FOG RH)

(a) Temporarily replace the rear light bulb (rear fog LH or rear fog RH) with a new or normally functioning one.

(b) Check that the bulb illuminates.

OK:

Fog light bulb illuminates.

OK -- END
NG -- Continue to next step.

4. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY)

(a) Disconnect the LB junction block connector.





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

Standard voltage:





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

5. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - REAR COMBINATION LIGHT (REAR FOG LH OR REAR FOG RH) - BODY GROUND)

(a) Check the wire harness between the rear combination light (rear fog LH) and No. 1 junction block, and the rear combination light (rear fog LH) and body ground.





(1) Disconnect the Y2 light connector.

(2) Disconnect the LA junction block connector.

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

Standard resistance:





(4) Connect the LA junction block connector.

(5) Measure the resistance of the wire harness side connector.

Standard resistance:





(b) Check the wire harness between the rear combination light (rear fog RH) and No. 1 junction block, and the rear combination light (rear fog RH) and body ground.





(1) Disconnect the Y9 light connector.

(2) Disconnect the LA junction block connector.

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

Standard resistance:





(4) Connect the LA junction block connector.

(5) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

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