Mitsubishi Galant. Manual — part 684
SWS DIAGNOSIS
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-131
STEP 8. Check headlight relay (high) connector A-07X and
front-ECU connector A-09X for damage.
Q: Are headlight relay (high) connector A-07X and front-
ECU connector A-09X in good condition?
YES : Go to Step 9.
NO : Repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection
. The
headlights (high-beam) should illuminate normally.
STEP 9. Check the harness wire between headlight relay
(high) connector A-07X and front-ECU connector A-09X.
Q: Is the harness wire between headlight relay (high)
connector A-07X and front-ECU connector A-09X in
good condition?
YES : Go to Step 10.
NO : Repair it. The headlights (high-beam) should
illuminate normally.
STEP 10. Check headlight connectors A-27 and A-32 for
damage.
Q: Are headlight connectors A-27 and A-32 in good
condition?
YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. The headlights (high-
beam) should illuminate normally.
AC003128 AI
A-09X
CONNECTORS: A-07X, A-09X
FRONT - ECU
A-07X
HEADLIGHT
RELAY(HI)
BATTERY
AC003128 AJ
CONNECTOR: A-07X
HEADLIGHT
RELAY(HI)
BATTERY
AC003129 AD
CONNECTORS: A-27, A-32
A-27
A-32
SWS DIAGNOSIS
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-132
STEP 11. Check the harness wires between headlight relay
(high) connector A-07X and headlight connectors A-27 and
A-32.
NOTE: After checking intermediate connector C-05, check the
wires. If intermediate connector C-05 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection
.
Q: Are the harness wires between headlight relay (high)
connector A-07X and headlight connectors A-27 and A-
32 in good condition?
YES : Replace the front-ECU. The headlights (high-beam)
should illuminate normally.
NO : Repair them. The headlights (high-beam) should
illuminate normally.
Inspection Procedure I-4: Headlight, taillight: Headlights do not illuminate when the passing switch is
operated.
HEADLIGHTS DO NOT ILLUMINATE WHEN THE
PASSING SWITCH IS OPERATE.
If the column switch or the front-ECU is suspected to
be defective.
TROUBLESHOOTING HINTS
•
Malfunction of the column switch (turn-signal light
and lighting switch)
•
Malfunction of the front-ECU
•
Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
•
MB991502: Scan Tool (MUT-II)
•
MB991529: Diagnostic Trouble Code Check Harness
AC003128 AJ
CONNECTOR: A-07X
HEADLIGHT
RELAY(HI)
BATTERY
AC003129 AD
CONNECTORS: A-27, A-32
A-27
A-32
AC003089 AC
CONNECTOR: C-05
SWS DIAGNOSIS
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-133
STEP 1. Check the headlight (low-beam and high-beam)
operation.
Q: Do the headlights (low-beam and high-beam) illuminate
normally?
YES : Go to Step 2 <when using scan tool MB991502> or 3
<when using a voltmeter>.
NO : Solve the problem first. Refer to
.
STEP 2. Check the input signal (by using scan tool
MB991502).
Check the input signal from the passing switch.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1)Connect scan tool MB991502 to the data link connector.
(2)Check that the tone alarm of scan tool MB991502 sounds
when the input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when
the input signal enters?
YES : Replace the front-ECU. The passing switch should
work normally.
NO : Check the passing switch input circuit. Refer to
Inspection Procedure N-14 (
).
STEP 3. Check the input signal (by using a voltmeter).
Check the input signal from the passing switch.
(1)Use special tool MB991529 to connect a voltmeter between
ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.
(2)Check that the voltmeter indicator deflects once when the
input signal enters.
Q: Does the voltmeter indicator deflect?
YES : Replace the front-ECU. The passing switch should
work normally.
NO : Check the passing switch input circuit. Refer to
Inspection Procedure N-14 (
).
AC003081 AB
16 PIN
MB991502
AC003083
16 PIN
AB
ETACS-ECU
TERMINAL
GROUNDED TERMINAL
MB991529
SWS DIAGNOSIS
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-134
Inspection Procedure I-5: Headlight, taillight: High-beam indicator light does not illuminate.
AC004212
High-beam Indicator Light Circuit
AC002299 AC
FUSIBLE LINK (1)
AC003089 AD
CONNECTOR: C-29
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