Mitsubishi Galant. Manual — part 666

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-59

STEP 2. Check the input signal (by using scan tool
MB991502).
Check the input signal from the driver's door lock actuator
switch.

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 : Replace the ETACS-ECU. All doors should be locked

by using the driver's inside lock knob.

NO : Check the driver's door lock actuator switch input

circuit. Refer to Inspection Procedure N-09 (

P.54B-

220

).

STEP 3. Check the input signal (by using a voltmeter).
Check the input signal from the driver's door lock actuator
switch.
(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 : Replace the ETACS-ECU. All doors should be locked

by using the driver's inside lock knob.

NO : Check the driver's door lock actuator switch input

circuit. Refer to Inspection Procedure N-09 (

P.54B-

220

).

Inspection Procedure C-6: Central door locking system: Forgotten key prevention function does not
operate.

TECHNICAL DESCRIPTION (COMMENT).
The ETACS-ECU operates the forgotten key
prevention function, based on the input signals from
the following switches:

•

Key reminder switch

•

Driver's or passenger's door switch

•

Driver's or passenger's door lock actuator switch

If the function does not work normally, a defect on
the relevant circuit or the ETACS-ECU may be
suspected.

TROUBLESHOOTING HINTS

•

Malfunction of the key reminder switch

•

Malfunction of the driver's or front passenger's
door switch

•

Malfunction of the driver's or front passenger's
door lock actuator switch

•

Malfunction of the ETACS-ECU

•

Damaged harness wires or connectors

AC003081 AB

16 PIN

MB991502

AC003083

16 PIN

AB

ETACS-ECU
TERMINAL

GROUNDED TERMINAL

MB991529

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-60

DIAGNOSIS

Required Special Tools:

•

MB991502: Scan Tool (MUT-II)

•

MB991529: Diagnostic Trouble Code Check Harness

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 following switches:

•

Key reminder switch

•

Driver's and front passenger's door switch

•

Driver's and front passenger's door lock actuator switch

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 : Replace the ETACS-ECU. The forgotten key

prevention function should work normally.

NO : Check the relevant input circuit. Refer to

P.54B-9

.

STEP 3. Check the input signal (by using scan tool
MB991502).
Check the input signals from the following switches:

•

Key reminder switch

•

Driver's and front passenger's door switch

•

Driver's and front passenger's door lock actuator switch

(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 : Replace the ETACS-ECU. The forgotten key

prevention function should work normally.

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-61

Inspection Procedure D-1: Power window relay: Power windows do not work at all.

AC004204

Power Window Relay Circuit

AC002299AD

FUSIBLE LINK (3)

AC003128 AB

A-09X

CONNECTORS: A-04X, A-09X

FRONT - ECU

A-04X

POWER
WINDOW
RELAY

BATTERY

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-62

CIRCUIT OPERATION

•

The power window relay is controlled by the front-
ECU and the ETACS-ECU

•

The front-ECU operates the power window relay
if the front-ECU receives request signal from the
ETACS-ECU, or ignition switch (IG1) signal from
the front-ECU itself.

TECHNICAL DESCRIPTION (COMMENT)
The power window relay or the front-ECU may be
defective.

TROUBLESHOOTING HINTS

•

Malfunction of the power window relay

•

Malfunction of the front-ECU

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:

•

MB991223: Test Harness Set

STEP 1. Check the power window relay.

Q: Is the power window relay in good condition?

YES : Go to Step 2.
NO : Replace it. The power windows should work normally.

AC003079AI

CONNECTOR
BLOCK (LH)

CONNECTORS: C-66, C-68

C-66

C-68

AC003082AC

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-82

AC003086AB

DOOR

CONNECTOR: E-16

BATTERY
VOLTAGE

TESTER
CONNECTION

SPECIFIED
CONDITION

Not applied

1

−

3

Continuity

1

−

Battery (+)

terminal,
3

−

Battery (

−

)

terminal

4

−

5

Continuity

1

2 3

4

5

1

3

4

5

ACX01544