Mitsubishi Lancer Evolution 7. Manual — part 394
SWS -
Troubleshooting
54B-21
Inspection Procedure F-3
The headlamps (low-beam) do not light.
Probable cause
If the (low-beam) headlamp on neither side lights up, either the headlamp switch
input circuit system or the front-ECU may be defective.
D
Column switch fault
D
front-ECU fault
D
Harness or connector fault
NO
Check the MUT-II input signals.
D
Headlamp switch
NG
Check the headlamp switch input circuit system (Refer to
P.54B-31, Inspection Procedure J-7).
NG
Repair
NG
Check the harness between the front-ECU and the battery,
and repair if necessary.
OK
Replace front-ECU.
OK
Check the trouble
symptoms.
OK
Measure at the front-ECU connector A-10X.
D
Disconnect the connector and test on the relay box side.
D
Voltage between terminal 3 and the body earth.
OK : System voltage
NG
Check the following connector: A-10X
MUT-II diagnosis code
When the ignition switch is in the LOCK (OFF) position, is the
diagnosis code output?
YES
Diagnosis Code Chart (Refer to P.54B-3).
NOTES:
1. If only one of the headlamps fails to light up, check the headlamp bulb and the harness between
the front-ECU and the headlamps, and between the headlamps and body earth.
2. When failure is detected on the harness from the front-ECU to the battery, check and repair the
front-ECU No. 4 terminal (A-10X) as well.
Inspection Procedure F-4
The headlamps (high-beam) do not light.
Probable cause
If the (high-beam) headlamp on neither side lights up, either the dimmer switch
input circuit system or the front-ECU may be defective.
D
Column switch fault
D
front-ECU fault
D
Harness or connector fault
NG
Check the harness between the front-ECU and the battery,
and repair if necessary.
OK
Check the trouble
symptoms.
NG
Repair
OK
Measure at the front-ECU connector A-10X.
D
Disconnect the connector and test on the relay box side.
D
Voltage between terminal 4 and the body earth.
OK : System voltage
NG
Check the following connector: A-10X
YES
Check the MUT-II input signals.
D
Dimmer switch
NG
Check the dimmer switch input circuit system (Refer to
P.54B-31, Inspection Procedure J-7).
OK
Replace front-ECU.
Are the headlamps (low-beam) operating normally?
NO
Check the headlamps (low-beam) (Refer to P.54B-21,
Inspection Procedure F-3).
NOTE
1.
If only one of the headlamps fails to light up, check the headlamp bulb and the harness between
the front-ECU and the headlamps, and between the headlamps and body earth.
2. When failure is detected on the harness from the front-ECU to the battery, check and repair the
front-ECU No. 3 terminal (A-10X) as well.
SWS -
Troubleshooting
54B-22
Inspection Procedure F-5
The headlamps (low or high-beam) do not work when the
passing switch is ON.
Probable cause
If the headlamps (low and high-beams) are normal, either the passing switch
input circuit system or the front-ECU may be defective.
D
Column switch fault
D
front-ECU fault
D
Harness or connector fault
OK
Replace front-ECU.
YES
Check the MUT-II input signals.
D
Passing switch
NG
Check the passing switch input circuit system (Refer to
P.54B-31, Inspection Procedure J-7).
Are the headlamps (low and high-beams) operating normally?
NO
Check the headlamps (Refer to P.54B-7, Trouble Symptom
Chart).
Inspection Procedure F-6
The headlamp automatic cut-off function is not working
normally.
Probable cause
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.
D
Driver’s door switch fault
D
Column switch fault
D
front-ECU fault
D
ETACS-ECU fault
D
Harness or connector fault
NG
Replace front-ECU.
NG
Replace ETACS-ECU.
Check the trouble symptoms.
Check the trouble symptoms.
YES
NG
Check the defective input circuit. (Refer to P.54B-8, Defects
Found by Input Signal Check).
Are the tail lamps and headlamps operating normally?
NO
Check the headlamps and tail lamps (Refer to P.54B-7,
Trouble Symptom Chart).
Check the MUT-II input signals.
D
Ignition switch (IG1)
D
Driver’s door switch
D
Tail lamp switch
D
Headlamp switch
OK
SWS -
Troubleshooting
54B-23
Inspection Procedure L-1
Rear fog lamp is not properly illuminated.
Probable cause
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.
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
Check the trouble symptoms.
NG
Repair
OK
Check the trouble symptoms.
YES
NG
Check the rear fog lamp switch input circuit (Refer to P.54B-8,
Inspection Procedure J-4).
Are the tail lamps and headlamps operating normally?
NO
Check the headlamps and tail lamps (Refer to P.54B-7,
Trouble Symptom Chart).
OK
NG
Check the MUT-II input signals.
D
Rear fog lamp switch
Replace
OK
Check the rear fog lamp relay (Refer to GROUP 54A – Rear
Fog Lamp).
NG
Check the following connectors:
C-219, C-208, C-213
NG
Check and repair the harness from the rear fog lamp relay to
the battery.
OK
Check the trouble
symptoms.
Check the following connectors:
C-219, C-208, C-133, F-16
OK
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
Replace ETACS-ECU.
NG
Replace front-ECU.
NG
Repair
NG
NG
Check the harnesses of the rear fog lamp relay - the
front-ECU, and the rear fog lamp relay - the rear fog lamps.
SWS -
Troubleshooting
SWS -
Troubleshooting
54B-24
Inspection Procedure H-1
The turn signal lamp do not light.
Probable cause
The ETACS-ECU controls the turn signal lamps based on input signals from the
following switches.
D
Ignition switch (IG1)
D
Turn signal lamp left-hand switch
D
Turn signal lamp right-hand switch
If none of the turn signal lamps are operating normally, either one of the above
input circuit systems or the ETACS-ECU may be defective.
D
Column switch fault
D
ETACS-ECU fault
D
Harness or connector fault
NG
Check the defective
input circuit. (Refer to
P.54B-8, Defects Found
by Input Signal Check).
OK
Replace ETACS-ECU.
NG
Repair
NG
Check the harness between the ETACS-ECU and the battery,
and repair if necessary.
Replace ETACS-ECU.
OK
OK
Check the trouble
symptoms.
NO
Measure at ETACS-ECU connector C-226.
D
Disconnect the connector and test on the junction box
side.
D
Voltage between terminal 11 and the body earth.
OK : System voltage
NG
Check the following connectors: C-226, C-209, C-135
Are the hazard warning lamps lighting up normally?
YES
Check the MUT-II input signals.
D
Ignition switch (IG1)
D
Turn signal lamp left-hand switch
D
Turn signal lamp right-hand switch
NOTE
If only one of the turn signal lamps is not lighting, check the bulb and the harness between the ETACS-ECU
and the lamp, and between the lamp and the body earth.
Inspection Procedure H-2
The hazard warning lamps do not light up.
Probable cause
The ETACS-ECU controls the hazard warning lamps based on input signals from
the hazard warning lamp switch.
If the hazard warning lamps are not operating normally, either the hazard
warning lamp switch input circuit system or the ETACS-ECU may be defective.
D
Hazard warning lamp switch fault
D
ETACS-ECU fault
D
Harness or connector fault
OK
Replace ETACS-ECU.
OK
Check the MUT-II input signals.
D
Hazard lamp switch
NG
Check the hazard lamp switch input circuit (Refer to P.54B-27,
Inspection Procedure J-3).
YES
Do all of the following functions operate when the ignition
switch is in the LOCK (OFF) position?
D
Lights left ON reminder warning function
D
Central locking
NG
Check ETACS-ECU battery power circuit system (Refer to
P.54B-33, Inspection Procedure K-1).
Are the turn signal lamps operating normally?
NO
Check the turn signal lamps (Refer to P.54B-24, Inspection
Procedure H-1).
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