Mitsubishi Colt Ralliart. Manual - part 423

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-200

Step 4. SWS monitor data list
Check the SWS communication signal, which is 
related to the door-ajar warning lamp.

<Selected item> ETACS ECU

• Ignition switch: ON position

• 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 5.

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 5. ETACS switch data by using the SWS 
monitor
Check the ETACS-ECU input signal related to the 
door-ajar warning buzzer function.

• Doors other than the driver's door (including the 

tailgate): Closed to open

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

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

P.54C-222

."

Step 6. M.U.T.-III actuator test
Perform the actuator test for the combination meter, 
and check that the door-ajar warning lamp illumi-
nates (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.

Item No.

Item name

Normal 
condition

Item 30

IG SW(IG1)

ON

Item 32

DR DOOR SW

ON

Item No.

Item name

Normal 
condition

Item 40

ALL DOOR SW

ON

Main

Index

Group

TOC

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-201

INPUT SIGNAL PROCEDURES

Inspection Procedure N-1: The ignition switch (ACC) 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 ignition switch (ACC) is used to 
operate the functions below. If the signal is abnormal, 
these functions will not work normally.

• Windshield wiper and washer

• Rear wiper and washer

• Electric retractable remote controlled door mirror

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: B-133 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Ignition Switch (ACC) Input Circuit

ETACS-ECU

IGNITION
SWITCH (ACC)

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

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

Main

Index

Group

TOC

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-202

Step 2. Voltage measurement at the B-133 
ETACS-ECU connector.

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Ignition switch: ACC position

(3) Voltage between B-133 ETACS-ECU connector 

terminal No.74 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

Step 3. Check the wiring harness between B-133 
ETACS-ECU connector terminal No.74 to the 
ignition switch (ACC).

NOTE: Prior to the wiring harness inspection, check 
junction block connector B-129 and B-131, and 
repair if necessary.

• Check the power supply line 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. SWS monitor data list
Check the input signal from the ignition switch.

<Selected item> ETACS ECU

• Ignition switch: OFF (LOCK) → ACC

OK: Normal condition is displayed.

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.

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

AC310507 ES

5251

69

60

53

54

71

636261

70

56

65

58

73

67

57

66

72

64

55

59

68

74

Connector B-133 
(Harness side)

Item No.

Item name

Normal 
condition

Item 31

IG SW(ACC)

from OFF to ON

AC313827AB

B-131

B-131

B-129

B-133 (GR)

B-133

B-129

Connectors: B-129, B-131, B-133

Junction block (Rear view)

Harness side

Harness side

Harness side

Main

Index

Group

TOC

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-203

Inspection Procedure N-2: The ignition switch (IG1) 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 ignition switch (IG1) is used to 
operate the functions below. If the signal is abnormal, 
these functions will not work normally.

• Lamp reminder buzzer

• Power window timer

• Electric retractable remote controlled door mirror

• Ignition key cylinder illumination lamp

• Turn-signal lamp

• Room lamp

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: B-133 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Ignition Switch (IG1) 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

ETACS-ECU

IGNITION
SWITCH (IG1)

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

Main

Index

Group

TOC