Mitsubishi L200. Manual — part 690
HEADLAMP
CHASSIS ELECTRICAL
54A-127
STEP 3. Check the wiring harness from A-116
headlamp (LH) connector terminal No.2 or A-126
headlamp (RH) connector terminal No.2 to body
earth.
• Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 4. Retest the system.
(1) Replace the socket of the defective headlamp.
(2) Check that the headlamps illuminate normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the headlamp.
STEP 5. Check the bulb(s) of the headlamps.
Check the bulb(s) of the defective lamp.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace the bulb(s) of the defective lamp.
STEP 6. Connector check: A-22X headlamp relay
(LO) connector
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the defective connector.
AC903898
AG
Connector: A-116
Harness side
A-116 (B)
AC903897
AG
Connector: A-126
Harness side
A-126 (B)
AC903878
AF
Connector: A-22X
Relay box side
HEADLAMP
CHASSIS ELECTRICAL
54A-128
STEP 7. Check the wiring harness from A-116
headlamp (LH) connector terminal No.1 or A-126
headlamp (RH) connector terminal No.1 to A-22X
headlamp relay (LO) connector terminal No.3.
• Check the output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the wiring harness.
STEP 8. Retest the system.
(1) Replace the socket of the defective headlamp.
(2) Check that the headlamps illuminate normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the headlamp.
STEP 9. Check the bulb(s) of the headlamps.
Check the bulb(s) of the defective lamp.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Replace the bulb(s) of the defective lamp.
STEP 10. Connector check: A-23X headlamp
relay (HI) connector
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the defective connector.
AC903878
AF
Connector: A-22X
Relay box side
AC903898
AG
Connector: A-116
Harness side
A-116 (B)
AC903897
AG
Connector: A-126
Harness side
A-126 (B)
AC903878
AD
Connector: A-23X
Relay box side
HEADLAMP
CHASSIS ELECTRICAL
54A-129
STEP 11. Check the wiring harness from A-116
headlamp (LH) connector terminal No.3 or A-126
headlamp (RH) connector terminal No.3 to A-23X
headlamp relay (HI) connector terminal No.3.
• Check the output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the wiring harness.
STEP 12. Retest the system.
(1) Replace the socket of the defective headlamp.
(2) Check that the headlamps illuminate normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the headlamp.
AC903878
AD
Connector: A-23X
Relay box side
AC903898
AG
Connector: A-116
Harness side
A-116 (B)
AC903897
AG
Connector: A-126
Harness side
A-126 (B)
HEADLAMP
CHASSIS ELECTRICAL
54A-130
Inspection Procedure 5: One of the headlamps does not illuminate. <4-bulb type>
CAUTION
Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the commu-
nication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
When one of the headlamps does not illuminate, the
wiring harness, connector(s), or the bulb may have a
problem, or the fuse may be burned out.
PROBABLE CAUSES
• Malfunction of the headlamp bulbs
• Damaged harness wires and connectors
Headlamps Circuit
HEADLAMP
(HI: RH)
HEADLAMP
(LO: RH)
HEADLAMP
(HI: LH)
HEADLAMP
(LO: LH)
HEADLAMP
RELAY (HI)
HEADLAMP
RELAY (LO)
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
RELAY BOX
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