Mitsubishi L200. Manual - part 686

HEADLAMP

CHASSIS ELECTRICAL

54A-111

STEP 2. M.U.T.-III data list
Check the input signal from the headlamp (low-
beam) switch.

• Turn the headlamp (low-beam) switch to the ON 

position.

OK: Normal condition is displayed.

Q: Is the check result normal?

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-22X headlamp relay 
(LO) connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

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

P.54A-148

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the headlamp relay (LO).

STEP 5. Voltage measurement at A-22X headlamp 
relay (LO) connector.

(1) Remove the headlamp relay (LO), and measure 

at the relay box side.

(2) Voltage between A-22X headlamp relay (LO) 

connector terminal Nos.2, 4 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

Item 
No.

Item name

Normal condition

60

Headlamp output

ON

AC903878

AF

Connector: A-22X

Relay box side

AC903878

AF

Connector: A-22X

Relay box side

AC310507FZ

Connector A-22X 

(Relay box side)

HEADLAMP

CHASSIS ELECTRICAL

54A-112

STEP 6. Check the wiring harness between A-22X 
headlamp relay (LO) connector terminal Nos.2, 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

AF

Connector: A-22X

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-113

STEP 8. Check the wiring harness from A-22X 
headlamp relay (LO) connector terminal No.1 to 
C-218 ETACS-ECU connector terminal No.17.

NOTE: 

Prior to the wiring harness inspection, check the 
junction block connector C-211 and repair if neces-
sary.

• 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 low-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

AF

Connector: A-22X

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

AC509936

Connector: C-211 <RHD>

Harness side

BE

Junction block 

(Front view)

HEADLAMP

CHASSIS ELECTRICAL

54A-114

Inspection Procedure 2: None of the high-beam headlamps illuminate.

CAUTION

Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM
If none of the high-beam headlamps illuminate, the 
headlamp switch input circuit, the headlamp relay 
(HI) or the ETACS-ECU may be defective.

PROBABLE CAUSES

• Malfunction of the headlamp relay (HI)

• 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. M.U.T.-III data list
Check the input signal from the dimmer switch.

• Operate the dimmer switch.

OK: Normal condition is displayed.

Q: Is the check result normal?

Headlamp Relay (High-Beam) Circuit

FUSIBLE 
LINK

23

RELAY 
BOX

ETACS-ECU

·HEADLAMP SWITCH
·DIMMER SWITCH

HEADLAMP 
RELAY 
(HI)

·HEADLAMP
·COMBINATION
 METER

INPUT SIGNAL

J/B SIDE

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

Item 
No.

Item name

Normal condition

61

Headlamp HI output

ON