Mitsubishi Lancer Evolution IX. Manual - part 168

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-235

INSPECTION PROCEDURE K-3: The door-ajar warning lamp does not illuminate/extinguish normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the door-ajar warning lamp does not work normally, 
the input signal circuits from all the door switches or 
the ETACS-ECU may be defective.

POSSIBLE CAUSES

• All the door switches are defective.

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the operation of the room lamp.

Q: Does the room lamp illuminate/extinguish?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure K-1 "The 
front, rear room lamp and/or luggage 
compartment lamp do not illuminate or 
extinguish normally 

P.54B-225

."

Step 2. Pulse check
Check the input signals below, which are related to 
the door-ajar warning lamp.

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

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

· ALL DOOR SWITCH

INPUT SIGNAL

COMBINATION
METER

· DRIVER'S DOOR SWITCH

Door Ajar Indicator Lamp Circuit

System switch

Check condition

Driver's door switch

Driver's door is opened 
while all the other doors 
are closed.

All of the door switches

A door is opened when 
all the doors are closed

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-236

Q: Is the check result normal?

All the signals are received normally. : 

Go to Step 

3.

The driver's door switch signal is not received. : 

Refer to inspection procedure L-3 "The door 
switch (front: LH) signal is not received <LH 
drive vehicles>

P.54B-244

 ." Refer to 

inspection procedure L-3 "The door switch 
(front: RH) signal is not received <RH drive 
vehicles>

P.54B-246

 ."

All the door switch signals are not received. : 

Refer to inspection procedure L-10 "All the 
door switch signals are not received <LH 
drive vehicles>

P.54B-265

 ." Refer to 

inspection procedure L-10 "All the door 
switch signals are not received <RH drive 
vehicles>

P.54B-268

 ."

Step 3. Connector check: C-01 and C-02 
combination meter connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

AC310447

Connectors: C-01, C-02

AE

<LHD>

C-01
Harness side

C-02 
Harness side

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

C-01

C-02(L)

AC310457

Connectors: C-01, C-02

AB

<RHD>

C-01
Harness side

C-02 
Harness side

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

C-01

C-02(L)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-237

Step 4. Check the door-ajar warning lamp bulb.
Check the door-ajar warning lamp bulb.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the door-ajar warning lamp bulb.

Step 5. Connector check: C-228 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

AC310450

Connector: C-228

AH

Junction block 
(rear view)

Harness side

<LHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310461

Harness side

Junction block (rear view)

Connector: C-228

AG

<RHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-238

Step 6. Check the wiring harness from C-228 
ETACS-ECU connector terminal Nos.53 and 71 to 
C-02 combination meter connector terminal 
No.34 and C-01 combination meter connector 
terminal No.8.

• Check the input or output lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. Retest the system.
Replace the ETACS-ECU, and then check that the 
door-ajar warning lamp illuminates/extinguishes nor-
mally.
(1) Replace the ETACS-ECU.
(2) Check that the door-ajar warning lamp 

illuminates/extinguishes normally.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Replace the combination meter.

AC310450

Connector: C-228

AH

Junction block 
(rear view)

Harness side

<LHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310461

Harness side

Junction block (rear view)

Connector: C-228

AG

<RHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310447

Connectors: C-01, C-02

AE

<LHD>

C-01
Harness side

C-02 
Harness side

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

C-01

C-02(L)

AC310457

Connectors: C-01, C-02

AB

<RHD>

C-01
Harness side

C-02 
Harness side

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

C-01

C-02(L)