Mitsubishi 380. Manual - part 105

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-417

STEP 6. Check the wiring harness between front door 
switch (RH) connector D-34 (terminal 1) and ETACS-ECU 
connector C-219 (terminal 10).

NOTE: Also check junction block connector C-204 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector C-204 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 front door switch (RH) 

connector D-34 (terminal 1) and ETACS-ECU connector 
C-219 (terminal 10) in good condition?
YES : Replace the ETACS-ECU. If the functions described 

in "CIRCUIT OPERATION" work normally, the input 
signal from the front door switch (RH) should be 
normal.

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 
functions described in "CIRCUIT OPERATION" work 
normally, the input signal from the front door switch 
(RH) should be normal.

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

16DB461A

CONNECTORS: D-22, D-34

D-34

D-22

HARNESS SIDE

 D-22, D-34

16DB324A

CONNECTOR: C-204

HARNESS SIDE

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-418

STEP 7. Check front door switch (LH) connector D-22 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector. 
Q: Is front door switch (LH) connector D-22 in good 

condition?
YES : Go to Step 8.
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 
front door switch (LH) should be normal.

STEP 8. Check the front door switch (RH).
Remove the front door switch (LH). Refer to GROUP 42, Door, 
Door Assembly 

P.42-37

. Then check continuity between the 

switch terminals and the body ground.

Q: Is the front door switch (LH) in good condition?

YES : Go to Step 9.
NO :  Replace the front door switch (LH). If the functions 

described in "CIRCUIT OPERATION" work normally, 
the input signal from the front door switch (LH) should 
be normal.

STEP 9. Measure resistance at the lower metal part of the 
front door switch (LH) in order to check the ground circuit 
to the front door switch (LH).

NOTE: Check that the front door switch (LH) is grounded to the 
vehicle body via its mounting screw.
Remove the cap, and measure the resistance value between 
the lower metal part and ground. 

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 10.
NO :  Check the installation of the switch, and repair if 

necessary. If the functions described in "CIRCUIT 
OPERATION" work normally, the input signal from the 
front door switch (LH) should be normal.

16DB461A

CONNECTORS: D-22, D-34

D-34

D-22

HARNESS SIDE

 D-22, D-34

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Released (ON)

1 

− body ground

Less than 2 ohms

Pressed (OFF)

1 

− body ground

Open circuit

1 2 3

ACX01865AC

ON

OFF

AC210276AB

METAL PART

CUP

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-419

STEP 10. Check ETACS-ECU connector C-218 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector. 
Q: Is ETACS-ECU connector C-218 in good condition?

YES : Go to Step 11.
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 
front door switch (LH) should be normal.

STEP 11. Check the wiring harness between front door 
switch (LH) connector D-22 (terminal 1) and ETACS-ECU 
connector C-218 (terminal 59).
Q: Is the wiring harness between front door switch (LH) 

connector D-22 (terminal 1) and ETACS-ECU connector 
C-218 (terminal 59) in good condition?
YES : Replace the ETACS-ECU. If the functions described 

in "CIRCUIT OPERATION" work normally, the input 
signal from the front door switch (LH) should be 
normal.

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 
functions described in "CIRCUIT OPERATION" work 
normally, the input signal from the front door switch 
(LH) should be normal.

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

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

16DB461A

CONNECTORS: D-22, D-34

D-34

D-22

HARNESS SIDE

 D-22, D-34

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-420

INSPECTION PROCEDURE M-5: Column Switch: ETACS-ECU does not receive any signal from the 
taillamp switch, the headlamp switch, the passing lamp switch, the dimmer switch or the turn-signal 
lamp switch.

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 ETACS-ECU operates the following equipment 
or functions according to signal from the column 
switch (turn-signal lamp and lighting switch):

• Light reminder tone alarm function

• Turn-signal lamp buzzer
• Headlamp

• Turn-signal lamp

• High-beam indicator

• Turn-signal indicators

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the equipment or functions 
described in "CIRCUIT OPERATION" do not work 
normally. If the signal is not normal, the column 
switch (turn-signal lamp and lighting switch) or the 
ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The column switch (turn-signal lamp and lighting 

switch) may be defective

• The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

•  MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Test Probe Harness