Mitsubishi Galant. Manual — part 675

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-95

STEP 1. Check method of the input signal

Q: Which is to be used, the scan tool or the voltmeter to

check the input signal?
Scan tool MB991502 : Go to Step 2.
Voltmeter : Go to Step 3.

STEP 2. Check the input signal (by using scan tool
MB991502).
Check the input signals from the Windshield intermittent wiper
interval adjusting knob switches.

NOTE: If the windshield intermittent wiper interval adjusting
knob is rotated from "FAST" to "SLOW" when the ignition
switch is at the "ON" position, the ETACS-ECU will send a
signal around the medium knob position.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1)Connect scan tool MB991502 to the data link connector.
(2)Check that the tone alarm of scan tool MB991502 sounds

when the input signal enters.

Q: Does the tone alarm of scan tool MB991502 sound when

the input signal enters?
YES : Go to Step 4.
NO : Check the relevant input circuit. Refer to

P.54B-9

.

STEP 3. Check the input signal (by using a voltmeter).
Check the input signals from the Windshield intermittent wiper
interval adjusting knob switches.

NOTE: If the windshield intermittent wiper interval adjusting
knob is rotated from "FAST" to "SLOW" when the ignition
switch is at the "ON" position, the ETACS-ECU will send a
signal around the medium knob position.
(1)Use special tool MB991529 to connect a voltmeter between

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.

(2)Check that the voltmeter indicator deflects once when the

input signal enters.

Q: Does the voltmeter indicator deflect?

YES : Go to Step 4.
NO : Check the relevant input circuit. Refer to

P.54B-9

.

AC003081 AB

16 PIN

MB991502

AC003083

16 PIN

AB

ETACS-ECU
TERMINAL

GROUNDED TERMINAL

MB991529

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-96

STEP 4. Replacement of ECU
(1)Replace the front-ECU.
(2)The windshield intermittent wiper interval should be

changed.

Q: Is it possible to adjust the windshield intermittent wiper

interval?
YES : There is no action to be taken.
NO : Replace the ETACS-ECU. The windshield intermittent

wiper interval should be changed.

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-97

Inspection Procedure F-5: Windshield wiper and washer: Windshield washer does not work.

Windshield Washer Motor Driver Circuit

AC004207

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-98

CIRCUIT OPERATION
A signal from the windshield washer switch is sent
through the column-ECU inside the column switch to
the front-ECU. The signal turns on the relay inside
the front-ECU to operate the washer motor.

TECHNICAL DESCRIPTION (COMMENT)
The washer motor, the column switch (windshield
wiper and washer switch) or the front-ECU may be
defective.

TROUBLESHOOTING HINTS

•

Malfunction of the washer motor

•

Malfunction of the column switch (windshield
wiper and washer switch)

•

Malfunction of the front-ECU

•

Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

•

MB991502: Scan Tool (MUT-II)

•

MB991529: Diagnostic Trouble Code Check Harness

ACX02500 AD

BATTERY

CONNECTOR: A-09X

AC003129 AC

CONNECTOR: A-33

AC003089 AC

CONNECTOR: C-05

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003082AK

CONNECTORS: C-73, C-77

C-73

JUNCTION BLOCK
(FRONT VIEW)

C-77

AC003080AH

CONNECTOR: C-87

JUNCTION BLOCK
(REAR VIEW)