Mitsubishi Colt Ralliart. Manual - part 413

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-160

INSPECTION PROCEDURE J-8: The headlamps do not illuminate when the lamping switch is at 
"TAIL" or "PASSING" position, but illuminate only at low beam when the switch is at "HEAD" position. 
However, the headlamps do not illuminate at high beam.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the headlamps illuminate only at low beam regard-
less of the lighting switch position, the headlamp 
fail-safe function may be activated.

POSSIBLE CAUSES

• Malfunction of the column switch

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the 
column switch (column-ECU) and the SWS commu-
nication lines are normal.

• Ignition switch: OFF

ECU TO BE CHECKED

• COLUMN ECU

OK:"OK" is displayed on the "COLUMN 
ECU" menu.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure A-2 
"Communication with column switch 
(column-ECU) is not possible 

P.54C-37

."

Step 2. Retest the system.
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 column switch.

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-161

FOG LAMP

INSPECTION PROCEDURE K-1: The fog lamps 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 fog lamps do not illuminate normally, the input 
signal circuit(s) below or the ETACS-ECU may be 
defective.

• Tail lamp switch

• Headlamp switch

• Fog lamp switch

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the fog lamp switch

• Malfunction of the front-ECU

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the tail/stop lamps and 
headlamps operate.
Check that the tail/stop lamps and headlamps illumi-
nate normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the tail/stop lamp(s) and 
headlamp(s). Refer to trouble symptom 
chart 

P.54C-29

.

Fog Lamp Relay 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

ETACS-ECU

FOG LAMP
RELAY

FOG LAMP

FUSIBLE
LINK

6

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-162

Step 2. ECU check by using the SWS monitor
Check that the power supply and earth lines to the 
column switch (column-ECU) and the ETACS-ECU 
the SWS communication lines are normal.

• Ignition switch: OFF

ECU TO BE CHECKED

• COLUMN ECU

• ETACS ECU

OK: "OK" are displayed for all the items

Q: Is the check result normal?

"OK" are displayed for all the items : 

Go to Step 3.

"NG" is displayed on the "COLUMN ECU" menu. : 

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-37

."

"NG" is displayed on the "ETACS ECU" menu. : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-41

."

Step 3. Function diagnosis by using the SWS 
monitor
Check the SWS communication signal, which are 
related to the fog lamps.

<Selected item> LIGHTING - F.FOG LAMP

• Ignition switch: ON

• Lighting switch: "TAIL" or "HEAD"

OK: Normal conditions are displayed for all 
the items.

Q: Is the check result normal?

Normal conditions are displayed for all the items. : 

Go to Step 4.

Normal condition is not displayed for item 00 or 01. 
: 

Refer to inspection procedure N-4 "Column 
switch (lighting and turn-signal lamp switch) 
signal is not received 

P.54C-208

."

Normal condition is not displayed for item No.30. : 

Refer to inspection procedure N-2 "The 
ignition switch (IG1) signal is not received 

P.54C-203

."

Step 4. ETACS switch data by using the SWS 
monitor
Check the ETACS-ECU signals which are related to 
the fog lamps.

• Fog lamp switch: ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Refer to inspection procedure N-13 "The fog 
lamp switch signal is not received 

P.54C-231

."

Step 5. Connector check: B-115 fog lamp relay 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

Step 6. Check the fog lamp relay.
Refer to GROUP 54A 

− Fog lamp 

P.54A-79

.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the fog lamp relay.

Item No.

Item name

Normal 
condition

Item 00

HEADLAMP SW

ON when the 
lighting switch is 
at HEAD

Item 01

TAIL LAMP SW

ON when the 
lighting switch is 
at TAIL

Item 30

IG SW(IG1)

ON

Item No.

Item name

Normal 
condition

Item 10

F.FOG LAMP SW

ON

AC313824 AH

Connector: B-115

Junction block side

Junction block (Front view)

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-163

Step 7. Voltage measurement at the B-115 fog 
lamp relay connector.

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

junction block side.

(2) Check the voltage between the fog lamp relay 

connector and body earth.

• Voltage between B-115 fog lamp relay con-

nector terminal No.1 and body earth

• Voltage between B-115 fog lamp relay con-

nector terminal No.3 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Go to Step 8.

Step 8. Check the wiring harness between B-115 
fog lamp relay connector terminals Nos.1 and 3 
to the fusible link (6).

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

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the wiring harness.

Step 9. Connector check: B-133 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the defective connector.

AC313824 AH

Connector: B-115

Junction block side

Junction block (Front view)

AC310507 FF

Connector B-115
(Junction block side)

AC313825

Connectors: B-108, B-115

AG

B-115

B-115

B-108 (B)

B-108

Junction block (Front view)

Harness side

Junction block side

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

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