Mitsubishi Galant 9G. Manual — part 90
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-356
STEP 20. Check headlight (HIGH: RH) connector A-31 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is headlight (HIGH: RH) connector A-31 in good
condition?
YES : Go to Step 21.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the headlight (HIGH: RH)
illuminates normally.
STEP 21. Check the headlight bulb (HIGH: RH).
(1) Remove the headlight bulb (HIGH: RH).
(2) Verify that the headlight bulb (HIGH: RH) is not damaged or
burned out.
Q: Is the headlight bulb (HIGH: RH) in good condition?
YES : Go to Step 22.
NO : Replace the headlight bulb (HIGH: RH). Verify that the
headlight (HIGH: RH) illuminates normally.
STEP 22. Check the ground circuit to the headlight (HIGH:
RH). Measure the resistance at headlight (HIGH: RH)
connector A-31.
(1) Disconnect headlight (HIGH: RH) connector A-31 and
measure the resistance available at the wiring harness side
of the connector.
(2) Measure the resistance value between terminal 2 and
ground.
• The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 24.
NO : Go to Step 23.
AC305206AU
CONNECTOR: A-31
A-31 (B)
HARNESS SIDE
AC305206AU
CONNECTOR: A-31
A-31 (B)
HARNESS SIDE
AC209364GS
CONNECTOR A-31
(HARNESS SIDE)
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-357
STEP 23. Check the wiring harness between headlight
(HIGH: RH) connector A-31 (terminal 2) and ground.
Q: Is the wiring harness between headlight (HIGH: RH)
connector A-31 (terminal 2) and ground in good
condition?
YES : Replace the headlight socket (HIGH: RH). Verify that
the headlight (HIGH: RH) illuminates normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the headlight (HIGH: RH) illuminates normally.
STEP 24. Check front-ECU connector A-11X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front-ECU connector A-11X in good condition?
YES : Go to Step 25.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the headlight (HIGH: RH)
illuminates normally.
STEP 25. Check the wiring harness between headlight
(LOW: RH) connector A-32 (terminal 1) and front-ECU
connector A-11X (terminal 10).
Q: Is the wiring harness between headlight (LOW: RH)
connector A-32 (terminal 1) and front-ECU connector
A-11X (terminal 10) in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the headlight (HIGH: RH) illuminates normally.
AC305206AU
CONNECTOR: A-31
A-31 (B)
HARNESS SIDE
AC305977AH
CONNECTOR: A-11X
RELAY BOX SIDE
AC305977AH
CONNECTOR: A-11X
RELAY BOX SIDE
AC305206
A-32 (BR)
HARNESS SIDE
CONNECTOR: A-32
AO
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-358
INSPECTION PROCEDURE H-8: Headlight and Taillight: The High-beam indicator light does not
illuminate.
NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
.
CIRCUIT OPERATION
At the same time that the high beams are illumi-
nated, the ETACS-ECU sends a signal to illuminate
the high beam indicator via the CAN bus line.
.
TECHNICAL DESCRIPTION (COMMENT)
If the high beam indicator does not illuminate nor-
mally, connector(s), wiring harness in the CAN bus
lines, the ETACS-ECU or the combination meter may
be defective.
.
TROUBLESHOOTING HINTS
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
• The combination meter may be defective
• The ETACS-ECU may be defective
.
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
INPUT SIGNAL
ETACS-
ECU
DIMMER SWITCH
COMBINATION
METER
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
High-Beam Indicator Light Circuit
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-359
STEP 1. Check the headlights.
When the lighting switch is operated, check that the headlights
illuminate/go off normally.
Q: Are the headlights in good condition?
YES : Go to Step 2.
NO : First, repair the headlights. Refer to Inspection
Procedure H-7 "One of the headlights does not
illuminate <2-bulb type>
" or "One of the
headlights does not illuminate <4-bulb
type>
."
STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958.Refer to "How to connect
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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