Mitsubishi 380. Manual - part 20

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-77

STEP 5. Check the wiring harness between ETACS-ECU 
connector C-218 (terminal 50), C-219 (terminal 3) and 
ground.

NOTE: Also check junction block connector C-211 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector C-211 is damaged, 
repair or replace the damaged component(s) as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between ETACS-ECU connector 

C-218 (terminal 50), C-219 (terminal 3) and ground in 
good condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. The system 
should communicate with the ETACS-ECU normally.

54DB045A

CONNECTORS: C-218, C-219

JUNCTION BLOCK
(REAR VIEW)

C-219

C-218 (GR)

HARNESS SIDE

C-218

C-219

JUNCTION BLOCK SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55

52DB023A

CONNECTOR: C-211

C-211

HARNESS SIDE

JUNCTION BLOCK

(FRONT VIEW)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-78

STEP 6. Check column switch connector C-309 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is column switch connector C-309 in good condition?

YES : Go to Step 7.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The system should communicate with the 

ETACS-ECU normally.

STEP 7. Check the wiring harness between column switch 
connector C-309 (terminal 2) and ETACS-ECU connector 
C-218 (terminal 62).
Q: Is the wiring harness between column switch connector 

C-309 (terminal 2) and ETACS-ECU connector C-218 
(terminal 62) in good condition?
YES : Go to Step 8.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. The system 
should communicate with the ETACS-ECU normally.

54DB051A

HARNESS SIDE

CONNECTOR: C-309

54DB006A

CONNECTORS: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55

54DB051A

HARNESS SIDE

CONNECTOR: C-309

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-79

STEP 8. Check the wiring harness between column switch 
connector C-309 (terminal 3) and ETACS-ECU connector 
C-218 (terminal 53).
Q: Is the wiring harness between column switch connector 

C-309 (terminal 3) and ETACS-ECU connector C-218 
(terminal 53) in good condition?
YES : Replace the ETACS-ECU. The system should 

communicate with the ETACS-ECU normally.

NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. The system 
should communicate with the ETACS-ECU normally.

54DB006A

CONNECTORS: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55

54DB051A

HARNESS SIDE

CONNECTOR: C-309

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-80

INSPECTION PROCEDURE A-4: Communication with the Front-ECU is not Possible.

NOTE: This troubleshooting procedure requires the 
use of diagnostic tool MB991958 and SWS monitor 
kit MB991813. For details on how to use the SWS 
monitor, refer to "How to connect SWS monitor 

P.54B-13

."

.

CIRCUIT OPERATION

• The power supply to the front-ECU is provided by 

the battery and the ignition switch (IG2).

• If the power supply system from the battery is 

defective, the system operates by the power sup-
ply from the ignition switch (IG2).

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

.

TECHNICAL DESCRIPTION (COMMENT)

It is suspected that the power supply circuit to the 
front-ECU is defective, or the wiring harness 
between the SWS monitor kit and the front-ECU or 
their connector(s) is damaged. If the battery power 
supply circuit to the ECU (terminal 5 of the 
front-ECU) is damaged, also check the power supply 
circuit from the ignition switch (IG2) (terminal 22 of 
the front-ECU), and repair if necessary.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The front-ECU may be defective

• The ETACS-ECU may be defective

AC305977AG

CONNECTORS: A-11X, A-12X

A-12X

A-11X

54DB052A

C-29

C-29

CONNECTOR:    C-29

54DB002A

CONNECTOR: C-218

C-218 (GR)

HARNESS SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55