Mitsubishi L200. Manual - part 687

HEADLAMP

CHASSIS ELECTRICAL

54A-115

YES : 

Go to Step 3.

NO : 

Refer to inspection procedure C-1 "The 
column switch (lighting and wiper switch) 
signal is not received 

P.54A-523

."

STEP 3. Connector check: A-23X headlamp relay 
(HI) connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. Check the headlamp relay (HI).
Refer to 

P.54A-148

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the headlamp relay (HI).

STEP 5. Voltage measurement at A-23X headlamp 
relay (HI) connector.

(1) Remove the headlamp relay (HI), and measure at 

the relay box side.

(2) Voltage between A-23X headlamp relay (HI) 

connector terminal Nos.1, 4 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

AC903878

AD

Connector: A-23X

Relay box side

AC903878

AD

Connector: A-23X

Relay box side

AC310507KY

Connector A-23X 

(Relay box side)

HEADLAMP

CHASSIS ELECTRICAL

54A-116

STEP 6. Check the wiring harness between A-23X 
headlamp relay (HI) connector terminal Nos.1, 4 
and the fusible link (23).

• Check the power supply line from the fusible link 

(23) for open circuit and short 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 7. Connector check: C-218 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

AC903878

AD

Connector: A-23X

Relay box side

AC503086

AE

Battery

Front of vehicle

24

23

22

21

20

19

Fusible link (23)

AC509934

Connector: C-218 <LHD>

AJ

Junction 

block

Junction block side

AC509943

Connector: C-218 <RHD>

AC

Junction block

 (Rear view)

Junction block side

HEADLAMP

CHASSIS ELECTRICAL

54A-117

STEP 8. Check the wiring harness from A-23X 
headlamp relay (HI) connector terminal No.2 to C-
218 ETACS-ECU connector terminal No.19.

NOTE: Prior to the wiring harness inspection, check 
the junction block connector C-211 and repair if nec-
essary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

STEP 9. Retest the system.
Check that the high-beam headlamps illuminate nor-
mally.

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 ETACS-ECU and register the 
ID codes (Refer to 

P.54A-39

).

AC903878

AD

Connector: A-23X

Relay box side

AC509935

Connectors: C-211, C-218 <LHD>

AB

Junction block

Junction block side

C-218

Harness side

C-211

C-218

C-211

AC509943

Connector: C-218 <RHD>

AC

Junction block

 (Rear view)

Junction block side

HEADLAMP

CHASSIS ELECTRICAL

54A-118

Inspection Procedure 3: The high-beam and low-beam headlamps do not illuminate when the passing 
switch is operated.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the low-beam and high-beam headlamps are nor-
mal, the passing switch input signal circuit or the 
ETACS-ECU may be defective.

PROBABLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK" 
(OFF) position, check that the ETACS-ECU does not 
set the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Refer to diagnosis code chart 

P.54A-494

.

NO : 

Go to Step 2.

STEP 2. Check that the headlamps operate.
Check that the low-beam and high-beam headlamps 
work normally.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the headlamps. Refer to trouble 
symptom chart 

P.54A-109

.

STEP 3. Retest the system.
When the passing switch is turned on, check if 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 column switch.