Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 489

54B-22
Inspection Procedure F-5
The headlamps (low or high-beam) do not work when the
passing switch is ON.
If the headlamps (low and high-beams) are normal, either the passing switch
input circuit system or the front-ECU may be defective.
Are the headlamps (low and high-beams) operating normally?
Check the MUT-II input signals.
D Passing switch
Replace front-ECU.
Inspection Procedure F-6
The headlamp automatic cut-off function is not working
normally.
The ETACS-ECU controls the headlamp automatic cut-off function based on input
signals from the following switches.
D Ignition switch (IG1)
D Driver's door switch
D Tail lamp switch
D Headlamp switch
If the headlamp automatic cut-off function is not operating normally, either one of
the above input circuit systems, the front-ECU, or the ETACS-ECU may be
defective.
Are the tail lamps and headlamps operating normally?
Check the MUT-II input signals.
D Ignition switch (IG1)
D Driver's door switch
D Tail lamp switch
D Headlamp switch
Check the trouble symptoms.
Replace ETACS-ECU.
SWS -
YES
OK
YES
OK
NG
Troubleshooting
Probable cause
D Column switch fault
D front-ECU fault
D Harness or connector fault
NO
Check the headlamps (Refer to P.54B-7, Trouble Symptom
Chart).
NG
Check the passing switch input circuit system (Refer to
P.54B-31, Inspection Procedure J-7).
Probable cause
D Driver's door switch fault
D Column switch fault
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 defective input circuit. (Refer to P.54B-8, Defects
Found by Input Signal Check).
Check the trouble symptoms.
Replace front-ECU.
NG