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