Mitsubishi Colt Ralliart. Manual - part 371

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-228

INSPECTION PROCEDURE N-13: The fog lamp switch signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the fog lamp switch is used to oper-
ate the fog lamps. If the signal is abnormal, the fog 
lamps will not illuminate and extinguish normally.

POSSIBLE CAUSES

• Malfunction of the fog lamp switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

ETACS-
ECU

FOG LAMP
SWITCH

Fog Lamp Switch Input 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 : Gray     R : Red     P : Pink     V : Violet

Main

Index

Group

TOC

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-229

DIAGNOSIS PROCEDURE

Step 1. Connector check: B-19 fog lamp switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Step 2. Check the fog lamp switch.
Refer to GROUP 54A 

− Fog lamp 

P.54A-79

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the fog lamp switch.

Step 3. Resistance measurement at the B-19 fog 
lamp switch connector.

(1) Remove the fog lamp switch, and measure at the 

wiring harness side.

(2) Resistance between B-19 fog lamp switch 

connector terminal No.2 and body earth

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

AC401055

Connector: B-19

AK

Harness side

AC401055

Connector: B-19

AK

Harness side

AC310506 DT

Connector B-19 
(Harness side)

Main

Index

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INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-230

Step 4. Check the wiring harness from B-19 fog 
lamp switch 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 

P.00-13

).

NO : 

Repair the wiring harness.

Step 5. Connector check: B-133 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

Step 6. Check the wiring harness from B-133 
ETACS-ECU connector No.58 to B-19 fog lamp 
switch connector terminal No.1.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. Retest the system.
Check that the fog lamp switch signal is received 
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.

AC401055

Connector: B-19

AK

Harness side

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

AC401055

Connector: B-19

AK

Harness side

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

Main

Index

Group

TOC

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-231

INSPECTION PROCEDURE N-14: The passenger's door switch signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the passenger's door switch is used 
to operate the functions below. If the signal is abnor-
mal, these functions will not work normally.

• Power window timer

• Door-ajar warning lamp

POSSIBLE CAUSES

• Malfunction of the passenger's door switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the installation condition.
Check that the door switch (front: LH) is installed on 
the body correctly.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Correct the installation condition.

Step 2. Connector check: C-19 door switch (front: 
LH) connector.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Check the door switch (front: LH).
Refer to GROUP 42 

− Door 

P.42-39

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the door switch (front: LH).

ETACS-
ECU

DOOR SWITCH 
(FRONT: LH)

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

Passenger's Door Switch Input Circuit

AC401059

Connector: C-19

AG

Harness side

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