Mitsubishi Colt Ralliart. Manual - part 349

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-140

Step 5. Check the wiring harness between B-123 
headlamp relay (LO) connector terminal Nos.1, 3 
and the fusible link (1).

NOTE: 

Prior to the wiring harness inspection, check the 
junction block connector B-108, and repair if neces-
sary.

• Check the power supply line from the fusible link 

(1) 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 6. Connector check: B-134 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

Step 7. 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 

P.00-13

).

NO : 

Replace the ETACS-ECU.

AC313870 AD

Connector: B-123

Junction Block (Front view)

Harness side

AC313870

Connector: B-108

BD

Junction block (Front view)

B-108(B)

Harness side

AC313872 AH

Connector: B-134

Harness side

Junction block (Rear view)

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-141

INSPECTION PROCEDURE J-3: The high-beam headlamps do not illuminate normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the high-beam headlamps do not illuminate, the 
headlamp switch input circuit, the headlamp relay 
(HI) or the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the headlamp relay (HI)

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the headlamps operate.
Check that the low-beam headlamps illuminate and 
extinguish normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure J-2 "The 
low-beam headlamps do not illuminate 
normally 

P.54B-138

."

Step 2. Pulse check
Check the input signal from the dimmer switch.

OK: The M.U.T.-III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to Inspection Procedure N-4 "The 
column switch (lighting and turn-signal lamp 
switch) signal is not received 

P.54B-206

."

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 : Gray     R : Red     P : Pink     V : Violet

Headlamp Relay (High-Beam) Circuit

ETACS-ECU

HEADLAMP
RELAY (HI)

HAEDLAMP

FUSIBLE
LINK

1

· HEADLAMP SWITCH

INPUT SIGNAL

· DIMMER SWITCH

System switch

Check condition

Dimmer switch

When the dimmer switch 
is turned from off to on

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-142

Step 3. Connector check: B-122 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 GROUP 54A 

− Headlamp 

P.54A-74

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the headlamp relay (HI).

Step 5. Voltage measurement at B-122 headlamp 
relay (HI) connector.

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

the junction block side.

(2) Voltage between B-122 headlamp relay (HI) 

connector terminal Nos.1, 3 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

Step 6. Check the wiring harness between B-122 
headlamp relay (HI) connector terminal Nos.1, 3 
and the fusible link (1).

NOTE: 

Prior to the wiring harness inspection, check the 
junction block connector B-108, and repair if neces-
sary.

• Check the power supply line from the fusible link 

(1) 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.

AC313870AE

Connector: B-122

Junction Block (Front view)

Harness side

AC313870AE

Connector: B-122

Junction Block (Front view)

Harness side

AC313972AU

Connector B-122 
(Junction block side)

AC313870AE

Connector: B-122

Junction Block (Front view)

Harness side

AC313870

Connector: B-108

BD

Junction block (Front view)

B-108(B)

Harness side

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-143

Step 7. Connector check: B-134 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

Step 8. 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 

P.00-13

).

NO : 

Replace the ETACS-ECU.

INSPECTION PROCEDURE J-4: 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.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the operation of the headlamps.
Check that the low-beam and high-beam headlamps 
illuminate normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the headlamps. Refer to trouble 
symptom chart 

P.54B-35

.

Step 2. Pulse check
Check the input signal from the passing switch.

OK: The M.U.T.-III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to Inspection Procedure N-4 "The 
column switch (lighting and turn-signal lamp 
switch) signal is not received 

P.54B-206

."

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 

P.00-13

).

NO : 

Replace the ETACS-ECU.

AC313872 AH

Connector: B-134

Harness side

Junction block (Rear view)

System switch

Check condition

Passing lamp switch

When the passing switch 
is turned from off to on

Main

Index

Group

TOC