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