Mitsubishi 380. Manual - part 108

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-429

INSPECTION PROCEDURE M-8: Sunroof Switch: ETACS-ECU does not receive any signal from the 
up, open or close/down switch.

.

CIRCUIT OPERATION

The ETACS-ECU receives a signal through the sun-
roof motor assembly via the SWS communication 
line from the sunroof switch, and sends a signal to 
the data link connector.

.

TECHNICAL DESCRIPTION (COMMENT)

If the SWS communication line between the sunroof 
motor assembly and the ETACS-ECU is defective, 
the ETACS-ECU cannot identify the input signal from 
the sunroof switch even if the sunroof is normal.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have 

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

• The sunroof motor assembly may be defective

• The ETACS-ECU may be defective

16DB462A

CONNECTOR: C-27

C-27

 C-27

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

54DB063A

CONNECTOR: D-04

HARNESS SIDE

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-430

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set

STEP 1. Check the sunroof operation.

Q: Does the sunroof work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure F-1 "Sunroof does not 

operate 

P.54B-210

."

STEP 2. Check sunroof motor assembly connector D-04 
and ETACS-ECU connector C-218 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are sunroof motor assembly connector D-04 and 

ETACS-ECU connector C-218 in good condition?
YES : Go to Step 3.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the sunroof operates normally, a correct 

signal is sent from the sunroof switch.

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

54DB063A

CONNECTOR: D-04

HARNESS SIDE

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-431

STEP 3. Check the wiring harness between sunroof motor 
assembly connector D-04 (terminal 10) and ETACS-ECU 
connector C-218 (terminal 53).

NOTE: Also check intermediate connector C-27. If intermediate 
connector C-27 is damaged, repair or replace the connector as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Q: Is the wiring harness between sunroof motor assembly 

connector D-04 (terminal 10) and ETACS-ECU connector 
C-218 (terminal 53) in good condition?
YES : Go to Step 4.
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. If the sunroof 
operates normally, a correct signal is sent from the 
sunroof switch.

STEP 4. Replace the sunroof motor assembly.
(1) Replace the sunroof motor assembly.
(2) If the sunroof operates normally, a correct signal is sent 

from the sunroof switch.

Q: Does the ETACS-ECU receive correct signals from the 

sunroof switch?
YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. If the sunroof operates 

normally, a correct signal is sent from the sunroof 
switch.

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

54DB063A

CONNECTOR: D-04

HARNESS SIDE

16DB462A

CONNECTOR: C-27

C-27

 C-27

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-432

INSPECTION PROCEDURE N-1: ETACS-ECU does not receive any signal from the key reminder 
switch.

.

CIRCUIT OPERATION

The ETACS-ECU operates the following functions or 
systems according to signal from the key reminder 
switch:

• Forgotten key reminder

• Keyless entry system

• Timed locking mechanism

• Dome lamp dimming function

• Ignition key hole illumination lamp

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the functions or systems 
described in "CIRCUIT OPERATION" do not work 
normally.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The key reminder switch may be defective

• The wiring harness or connectors may have 

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

• The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check key reminder switch connector C-310 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is key reminder switch connector C-310 in good 

condition?
YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the functions described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
key reminder switch should be normal.

16DB307A

CONNECTOR: C-217

HARNESS SIDE

25

26

27

28

29

21

22

23

24

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

JUNCTION BLOCK

(REAR VIEW)

54DB004A

CONNECTOR: C-310

HARNESS SIDE

54DB004A

CONNECTOR: C-310

HARNESS SIDE