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)