Mitsubishi Colt Ralliart. Manual - part 350

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-144

INSPECTION PROCEDURE J-5: The headlamp(s) do not illuminate.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If any of the headlamps does not illuminate, the wir-
ing harness connector(s), the bulb or the fuse may 
be defective or burned out.

POSSIBLE CAUSES

• Malfunction of the headlamp bulbs

• Damaged harness wires and connectors

HEADLAMP
RELAY (HI)

HEADLAMP
RELAY (LO)

FRONT
COMBINATION
LAMP
(HEAD: LH)

FRONT
COMBINATION
LAMP 
(HEAD: RH)

Headlamps Circuit

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

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Index

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-145

DIAGNOSTIC PROCEDURE

Step 1. Connector check: A-12 front combination 
lamp (HEAD: LH) connector or A-25 front 
combination lamp (HEAD: RH) connector

Q: Is the check result normal?

YES (Either of LH side and RH side does not 
illuminate) : 

Go to Step 2.

YES (Low-beam of LH side or RH side does not 
illuminate) : 

Go to Step 5.

YES (High-beam of LH side or RH side does not 
illuminate) : 

Go to Step 9.

NO (the connectors are not in good condition) : 

Repair the defective connector.

Step 2. Resistance measurement at the A-12 front 
combination lamp (HEAD: LH) connector or the 
A-25 front combination lamp (HEAD: RH) 
connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Check the resistance between the lamp 

connector and body earth.

• Resistance between A-12 front combination 

lamp (HEAD: LH) connector terminal No.6 
and body earth

• Resistance between A-25 front combination 

lamp (HEAD: RH) connector terminal No.6 
and body earth

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

AC509191

Connector: A-12

Harness side

AB

A-12 (B)

AC509176

Connector: A-25

Harness side

AC

A-25(B)

AC509191

Connector: A-12

Harness side

AB

A-12 (B)

AC509176

Connector: A-25

Harness side

AC

A-25(B)

AC313972 DJ

Connectors: A-12, A-25

(Harness side)

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Index

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-146

Step 3. Check the wiring harness from A-12 front 
combination lamp (HEAD: LH) connector 
terminal No.6 or A-25 front combination lamp 
(HEAD: RH) connector terminal No.6 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 

P.00-13

).

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 

P.00-13

).

NO : 

Replace the front combination lamp.

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: B-123 headlamp relay 
(LO) connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

AC509191

Connector: A-12

Harness side

AB

A-12 (B)

AC509176

Connector: A-25

Harness side

AC

A-25(B)

AC313870 AD

Connector: B-123

Junction Block (Front view)

Harness side

Main

Index

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TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-147

Step 7. Check the wiring harness from A-12 front 
combination lamp (HEAD: LH) connector 
terminal No.4 or A-25 front combination lamp 
(HEAD: RH) connector terminal No.4 to B-123 
headlamp relay (LO) connector terminal No.4.

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector B-112, and repair if necessary.

• 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 

P.00-13

).

NO : 

Replace the front combination lamp.

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: B-122 headlamp relay 
(HI) connector

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the defective connector.

AC509191

Connector: A-12

Harness side

AB

A-12 (B)

AC509176

Connector: A-25

Harness side

AC

A-25(B)

AC313870 AD

Connector: B-123

Junction Block (Front view)

Harness side

AC313870

Connector: B-112

BE

Junction block (Front view)

Harness side

AC313870AE

Connector: B-122

Junction Block (Front view)

Harness side

Main

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