Mitsubishi Galant (2004+). Manual — part 292
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-359
INSPECTION PROCEDURE H-7: Headlight and Taillight: One of the headlights does not illuminate.
<4-bulb type>
HEADLIGHT
RELAY: HIGH
PULSE WIDTH
MODULATOR
HEADLIGHT
(LOW: LH)
HEADLIGHT
(LOW: RH)
HEADLIGHT
(HIGH: LH)
HEADLIGHT
(HIGH: RH)
RELAY
BOX
FRONT-ECU
Headlights Circuit <4-bulb type>
AC305977AE
CONNECTOR: A-11X
AC305210
A-20 (BR)
A-21 (B)
CONNECTORS: A-20, A-21
AH
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-360
.
TECHNICAL DESCRIPTION (COMMENT)
If one of the headlights does not illuminate, a head-
light bulb may be defective.
.
TROUBLESHOOTING HINTS
• The headlight bulb may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the headlight operation.
Q: Which of the headlights does not illuminate?
Low (LH) : Go to Step 2.
Low (RH) : Go to Step 8.
High (LH) : Go to Step 14.
High (RH) : Go to Step 20.
Low beam only (both RH and LH) : Refer to Inspection
Procedure H-2 "The headlights (low-beam) do not
illuminate normally
High beam only (both RH and LH) : Refer to Inspection
Procedure H-3 "The headlights (high-beam) do not
illuminate normally
High beam indicator light : Refer to Inspection Procedure
H-8 "The high-beam indicator light does not illuminate
STEP 2. Check headlight (LOW: LH) connector A-20 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is headlight (LOW: LH) connector A-20 in good
condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the headlight (LOW: LH)
illuminates normally.
AC305206
A-31 (B)
A-32 (BR)
CONNECTORS: A-31, A-32
AP
AC305210AN
CONNECTOR: A-20
A-20 (BR)
HARNESS SIDE
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-361
STEP 3. Check the headlight bulb (LOW: LH).
(1) Remove the headlight bulb (LOW: LH).
(2) Verify that the headlight bulb (LOW: LH) is not damaged or
burned out.
Q: Is the headlight bulb (LOW: LH) in good condition?
YES : Go to Step 4.
NO : Replace the headlight bulb (LOW: LH). Verify that the
headlight (LOW: LH) illuminates normally.
STEP 4. Check the ground circuit to the headlight (LOW:
LH). Measure the resistance at headlight (LOW: LH)
connector A-20.
(1) Disconnect headlight (LOW: LH) connector A-20 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 6.
NO : Go to Step 5.
STEP 5. Check the wiring harness between headlight
(LOW: LH) connector A-20 (terminal 2) and ground.
Q: Is the wiring harness between headlight (LOW: LH)
connector A-20 (terminal 2) and ground in good
condition?
YES : Replace the headlight socket (LOW: LH). Verify that
the headlight (LOW: LH) 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 (LOW: LH) illuminates normally.
AC305210AN
CONNECTOR: A-20
A-20 (BR)
HARNESS SIDE
AC209364GP
CONNECTOR A-20
(HARNESS SIDE)
AC305210AN
CONNECTOR: A-20
A-20 (BR)
HARNESS SIDE
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-362
STEP 6. 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 7.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the headlight (LOW: LH)
illuminates normally.
STEP 7. Check the wiring harness between headlight
(LOW: LH) connector A-20 (terminal 1) and front-ECU
connector A-11X (terminal 6).
Q: Is the wiring harness between headlight (LOW: LH)
connector A-20 (terminal 1) and front-ECU connector
A-11X (terminal 6) 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 (LOW: LH) illuminates normally.
AC305977AH
CONNECTOR: A-11X
RELAY BOX SIDE
AC305977AH
CONNECTOR: A-11X
RELAY BOX SIDE
AC305210AN
CONNECTOR: A-20
A-20 (BR)
HARNESS SIDE
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