Rear Fog Lamp Is Not Properly Illuminated - Mitsubishi Lancer Evolution-VII Workshop Manual

Inspection Procedure L-1

Rear fog lamp is not properly illuminated.

If the tail lamps and the headlamps are normal when the rear fog lamps are not
illuminated, failure may occur on the rear fog lamp switch input circuit, the rear
fog lamp relay, and the front-ECU or ETACS-ECU.
Are the tail lamps and headlamps operating normally?
Check the MUT-II input signals.
D Rear fog lamp switch
Check the rear fog lamp relay (Refer to GROUP 54A – Rear
Fog Lamp).
Measure at the rear fog lamp relay connector C-219.
D Disconnect the connector and test on the junction box
side.
D Voltage between terminal 1 and the body earth
D Voltage between terminal 3 and the body earth
OK : System voltage
Check the following connectors:
C-219, C-208, C-133, F-16
Check the trouble symptoms.
Check the harnesses of the rear fog lamp relay - the
front-ECU, and the rear fog lamp relay - the rear fog lamps.
Repair
SWS -
YES
OK
OK
OK
OK
NG
NG
Troubleshooting
Probable cause
D Fog fog lamp switch inoperative
D Rear fog lamp relay inoperative
D front-ECU fault
D ETACS-ECU fault
D Harness or connector fault
NO
Check the headlamps and tail lamps (Refer to P.54B-7,
Trouble Symptom Chart).
NG
Check the rear fog lamp switch input circuit (Refer to P.54B-8,
Inspection Procedure J-4).
NG
Replace
NG
Check the following connectors:
C-219, C-208, C-213
OK
Check the trouble
symptoms.
NG
Check and repair the harness from the rear fog lamp relay to
the battery.
NG
Replace ETACS-ECU.
Check the trouble symptoms.
Replace front-ECU.
54B-23
NG
Repair
NG