Mitsubishi Colt Ralliart. Manual - part 419

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-184

INSPECTION PROCEDURE L-4: The turn-signal indicator lamp does not illuminate.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the turn-signal indicator lamp does not illuminate 
normally, connector(s), wiring harness in the CAN 
bus lines, the ETACS-ECU or the combination meter 
may be defective.

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Malfunction of the combination meter

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the hazard warning lamps 
operate.
Check that the hazard warning lamps illuminate nor-
mally.

Q: Is the check result normal?

YES : 

Go to Step2.

NO : 

 Refer to Inspection Procedure L-2 "The 
hazard warning lamps do not illuminate 
normally 

P.54C-173

."

Step 2. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, Diagnosis 

P.54D-13

).

Step 3. M.U.T.-III other system diagnosis code.
Check whether the combination meter-related diag-
nosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Troubleshooting 

P.54A-31

).

NO : 

Go to Step 4.

Step 4. ECU check by using the SWS monitor
Check that the power supply and earth lines to the 
ETACS-ECU and the SWS communication lines are 
normal.

• Ignition switch: OFF

ECU TO BE CHECKED

• ETACS ECU

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

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Refer to Inspection Procedure A-3 
"Communication with ETACS-ECU is 
impossible 

P.54C-41

."

INPUT SIGNAL

ETACS-ECU

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

· TURN-SIGNAL LAMP SWITCH
· HAZARD WARNING LAMP SWITCH

Turn-Signal Indicator Lamp Circuit

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Index

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TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-185

Step 5. M.U.T.-III actuator test
Perform the actuator test for the combination meter, 
and check that the turn-signal indicator lamps illumi-
nate (Refer to GROUP 54A 

− Combination Meter 

P.54A-62

).

Q:  Is the check result normal?

YES : 

Replace the ETACS-ECU.

NO : 

Replace the combination meter.

INSPECTION PROCEDURE L-5: The turn-signal lamps do not illuminate when the ignition switch is at 
the ACC position.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the turn-signal lamps do not illuminate with the igni-
tion switch at ACC, the input signal circuit from the 
ignition switch (ACC) may be defective or the SWS 
monitor customisation function has set "TURN-SIG-
NAL" to "IG-ON".

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Customize function by using the SWS 
monitor
Use the SWS monitor customisation function to con-
firm that "TURN-SIGNAL" is set to "IG-ACC."

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Use the SWS monitor customisation 
function to set "TURN-SIGNAL" to 
"IG-ACC." Refer to 

P.54C-240

.

Step 2. Check that the turn-signal lamps operate.
Check that the turn-signal lamps illuminate normally 
when the ignition switch is turned to the ON position.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

 Refer to Inspection Procedure L-1 "The 
turn-signal lamps do not illuminate normally 

P.54C-170

."

Step 3. SWS monitor data list
Check the ETACS-ECU signals which are related to 
the turn-signal lamp illumination when the ignition 
switch is at the ACC position.

<Selected item> ETACS-ECU

• Ignition switch: ACC position

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to inspection procedure N-1 "The 
Ignition switch (ACC) signal is not received 

P.54C-201

."

Step 4. Retest the system.
Check whether the turn-signal lights illuminate.

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.

Item No.

Item name

Normal 
condition

Item 31

IG SW (ACC)

ON

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-186

INTERIOR LAMP

INSPECTION PROCEDURE M-1: The interior lamps (room ramp, luggage compartment lamp) does not 
illuminate or extinguish normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU operates the interior lamps (room 
lamp, luggage compartment lamp) in accordance 
with the input signals below.

• Ignition switch (IG1)

• Key reminder switch

• All of the door switches

• Driver's door lock actuator

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be defec-
tive. Alternatively, it is possible that "RM LMP TN 
OFF" was set to "W/O FUNCTION" by using the 
SWS monitor customisation function.

POSSIBLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of the door switches

• Malfunction of the driver's door lock actuator

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Customize function by using the SWS 
monitor
Use the SWS monitor customisation function to con-
firm that "RM LMP TN OFF" is set to "7.5s", "15s", 
"30s" or "60s".

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Use the SWS monitor customisation 
function to set "RM LMP TN OFF" to "7.5s", 
"15s", "30s" or "60s". Refer to 

P.54C-240

.

· KEY CYLINDER

· ROOM LAMP 
· LUGGAGE
  COMPARTMENT
  LAMP

  ILLUMINATION
  LAMP

J/B SIDE

ETACS-ECU

POWER SOURCE

FUSIBLE
LINK

1

Interior Lamp 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

IGNITION
SWITCH (IG1)

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-187

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

• Ignition switch: OFF

ECU TO BE CHECKED

• ETACS ECU

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

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

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

P.54C-41

."

Step 3. SWS monitor data list
Check the SWS communication line signals related 
to the room lamp and the luggage compartment lamp 
illuminations.

<Selected item> ETACS

• Ignition switch: OFF

• Driver's door: open

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 No.30 : 

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

P.54C-203

."

Normal condition is not displayed for item No.32 : 

Refer to inspection procedure N-3 "The 
driver's door switch signal is not received 

P.54C-205

."

Step 4. ETACS switch data by using the SWS 
monitor
Check the ETACS-ECU signals related to the illumi-
nation of the room lamp and the luggage compart-
ment lamp.

• Ignition switch: OFF (key inserted)

• Doors other than the driver's door: Closed to 

open

• Driver's door lock actuator switch: UNLOCK → 

LOCK

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 5.

Normal condition is not displayed for item No.03 : 

Refer to inspection procedure N-7 "The key 
reminder switch signal is not received 

P.54C-213

 ."

Normal condition is not displayed for item No.40 : 

Refer to inspection procedure N-10 "All the 
door switch signals are not received 

P.54C-222

."

Normal condition is not displayed for item No.21 or 
22 : 

Refer to inspection procedure N-11 "The 
driver's door lock actuator switch signal is 
not received 

P.54C-226

."

Step 5. Check of the troubles
When the room lamp and the luggage compartment 
lamp switches are set to the DOOR or ON position, 
the room lamp and the luggage compartment lamp 
should illuminate normally.

Q: Is the check result normal?

The lamp illuminates at neither the ON nor DOOR 
position.  : 

Go to Step 6.

The lamp does not illuminate at the DOOR position. 
: 

Go to Step 8.

The lamp does not illuminate at the ON position. : 

Go to Step 10.

Item No.

Item name

Normal 
condition

Item 30

IG SW(IG1)

OFF

Item 32

DR DOOR SW

ON

Item No.

Item name

Normal 
condition

Item 03

KEY REMIN SW

OFF

Item 40

ALL DOOR SW

from ON 
to OFF

Item No.

Item name

Normal 
condition

Item 21

DR DOR LCK SW

from OFF 
to ON

Item 22

DR DOR ULK SW

from ON 
to OFF

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