Mitsubishi 380. Manual - part 107

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-425

STEP 2. Check the windshield wiper and washer switch.
Remove the windshield wiper and washer switch. Then check 
continuity between the switch terminals.

Q: Are the windshield wiper and washer switch in good 

condition?
YES : Go to Step 3.
NO :  Replace the windshield wiper and washer switch. If 

the equipment described in "CIRCUIT OPERATION" 
work normally, the input signal from the column switch 
(windshield wiper and washer switch) should be 
normal.

STEP 3. Replace the column switch.
(1) Replace the column switch.
(2) If the equipment described in "CIRCUIT OPERATION" work 

normally, the input signal from the column switch 
(windshield wiper and washer switch) should be normal.

Q: Does the column switch (windshield wiper and washer 

switch) send a normal signal to the ECU?
YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. If the equipment described 

in "CIRCUIT OPERATION" work normally, the input 
signal from the column switch (windshield wiper and 
washer switch) should be normal.

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

OFF

21 

− 23, 22 − 23, 23 − 

30, 23 

− 31, 23 − 32, 

25 

− 26, 25 − 29

Open circuit

Windshield mist 
wiper switch

23 

− 32

Less than 2 ohms

Windshield 
intermittent wiper 
switch

23 

− 31

Less than 2 ohms

Windshield 
low-speed wiper 
switch

23 

− 30

Less than 2 ohms

Windshield 
high-speed wiper 
switch

21 

− 23

Less than 2 ohms

Windshield washer 
switch

22 

− 23

Less than 2 ohms

AC003178

UPPER SIDE

AB

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-426

INSPECTION PROCEDURE M-7: Column Switch: ETACS-ECU does not receive any signal from the 
variable intermittent wiper control switch.

.

CIRCUIT OPERATION

The ETACS-ECU calculates the windshield intermit-
tent wiper interval according to the position of the 
variable intermittent wiper control switch, which is 
incorporated in column switch (windshield wiper and 
washer switch).

.

TECHNICAL DESCRIPTION (COMMENT)

If the windshield intermittent wiper interval cannot be 
adjusted, the column 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 may be defective (windshield 

wiper and washer switch)

• 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 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 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the wiper interval can be adjusted 

normally, the variable intermittent wiper control switch 
should send a signal to the ECU.

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

54DB051A

HARNESS SIDE

CONNECTOR: C-309

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-427

STEP 2. Check the variable intermittent wiper control 
switch.
(1) Remove the windshield wiper and washer switch, and 

check at the switch side.

(2) Measure the resistance value between terminals 27 and 28. 

The measured resistance should change smoothly from 
approximately 0 ohm ("FAST" position) to 1 k

Ω ("SLOW" 

position).

Q: Is the variable intermittent wiper control switch in good 

condition?
YES : Go to Step 3.
NO :  Replace the column switch (windshield wiper and 

washer switch). If the wiper interval can be adjusted 
normally, that the variable intermittent wiper control 
switch should send a signal to the ECU.

STEP 3. 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 4.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the wiper interval can be adjusted 

normally, that the variable intermittent wiper control 
switch should send a signal to the ECU.

AC003178

UPPER SIDE

AB

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

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-428

STEP 4. Check the wiring harness between column switch 
connector C-309 (terminal 6) and ETACS-ECU connector 
C-218 (terminal 60).
Q: Is the wiring harness between column switch connector 

C-309 (terminal 6) and ETACS-ECU connector C-218 
(terminal 60) in good condition?
YES : Go to Step 5.
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 wiper 
interval can be adjusted normally, the variable 
intermittent wiper control switch should send a signal 
to the ECU.

STEP 5. Replace the column switch.
(1) Replace the column switch.
(2) If the wiper interval can be adjusted normally, the variable 

intermittent wiper control switch should send a signal to the 
ECU.

Q: Can input signal be confirmed when the variable 

intermittent wiper control switch is operated?
YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. If the wiper interval can be 

adjusted normally, the variable intermittent wiper 
control switch should send a signal to the ECU.

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