Front Fog Light Circuit

LIGHTING SYSTEM: Front Fog Light Circuit

Front Fog Light Circuit

DESCRIPTION

The body ECU controls FOG relay when signal is received from headlight dimmer switch assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST BY 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 / Body / Active Test.
(e) Check the operation.

Body (Body ECU)





OK:
Front fog lights come on.
NG -- INSPECT FUSE
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT FUSE
(a) Inspect the FR FOG fuse and TAIL fuse in the instrument panel junction block assembly.
Resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT RELAY
(a) Inspect fog light relay continuity.
(1) Remove the fog light relay from the instrument panel J/B assembly.





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





(b) Inspect tail relay continuity.
(1) Remove the tail relay from the instrument panel J/B assembly.





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






NG -- REPLACE RELAY
OK -- Continue to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (POWER SOURCE CIRCUIT)
(a) Measure the voltage according to the value(s) in the table below.





Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
OK -- Continue to next step.
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Measure the voltage according to the value(s) in the table below.





Voltage:






NG -- INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR
6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Measure the voltage according to the value(s) in the table below.





Voltage:






NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR
(a) Measure the voltage according to the value(s) in the table below.





Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Measure the voltage according to the value(s) in the table below.





Voltage:






NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - INSTRUMENT PANEL JUNCTION BLOCK)
(a) Disconnect the B7 connector of multiplex network body ECU and the 1I connector of the instrument panel junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.





Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE