Mitsubishi Grandis. Manual - part 153

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-74

Step 8. Check the wiring harness between A-15X 
front-ECU terminal connector terminal No.31 and 
A-25 earth connector terminal No.5.

• Check the earth wires for open circuit.

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 : 

Repair the wiring harness.

Step 9. Connector check: C-221 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the defective connector.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC310403

A-25 (GR)

AE

Connector: A-25 <LHD>

Harness side

AC310398

A-25 (GR)

AE

Connector: A-25 <RHD>

Harness side

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-75

Step 10. Check the wiring harness between 
A-15X front-ECU connector terminal No.22 and 
C-221 ETACS-ECU connector terminal No.59.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-01 and intermediate connector C-125, 
and repair if necessary.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the wiring harness.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC310626

Connector: C-221

Junction block (Rear view)

<LHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310620

Connector: C-221

Junction block 
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310614

AT

Connectors: C-01, C-125 <LHD>

C-125

C-125

C-01

C-01

AC310631AE

Connector: C-01 <RHD>

AC310613

AD

Connector: C-125 <LHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-76

Step 11. ECU check by using the SWS monitor

Check that the power supply and earth lines to the 
front-ECU and the SWS communication lines are 
normal.

• Ignition switch: ON

ECUS TO BE CHECKED

• FRONT ECU

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

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 front-ECU.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-77

Inspection Procedure A-5: Communication with the power window main switch (power window 
module) is not possible.

CAUTION

Whenever the ECU is replaced, ensure that the 
power supply circuit, the earthing circuit and the 
communication circuit are normal.