Mitsubishi Galant. Manual — part 694

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-171

STEP 10. Check the input signal (by using scan tool
MB991502).
Check the input signals from the following switches:

•

Ignition key reminder switch

•

Driver's and front passenger's switch

•

Door switches

•

Driver's and front passenger's door key cylinder switch

•

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

•

Hood switch

•

Trunk lid latch switch

•

Trunk lid lock key cylinder switch

•

Transmitter

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 security indicator light

should illuminate, and the theft-alarm system should
be armed normally.

NO : Check the relevant input signal circuit. Refer to

P.54B-9

.

STEP 11. Check the input signal (by using a voltmeter).
Check the input signals from the following switches:

•

Ignition key reminder switch

•

Driver's and front passenger's switch

•

Door switches

•

Driver's and front passenger's door key cylinder switch

•

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

•

Hood switch

•

Trunk lid latch switch

•

Trunk lid lock key cylinder switch

•

Transmitter

(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 security indicator light

should illuminate, and the theft-alarm system should
be armed normally.

NO : Check the relevant input signal 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-172

Inspection Procedure M-2: Theft-alarm system: Horn does not sound when the theft-alarm is
triggered.

Theft-alarm Horn Circuit

AC004217

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-173

CIRCUIT OPERATION
The ETACS-ECU will sound the theft-alarm horn and
horn if the theft-alarm system or the keyless entry
system answerback is triggered.

TECHNICAL DESCRIPTION (COMMENT)
The theft-alarm horn is shared by the keyless entry
system. If the theft-alarm horn sounds normally
through the keyless entry system answerback, the
ETACS-ECU may be defective.

TROUBLESHOOTING HINTS

•

Malfunction of the theft-alarm horn

•

Malfunction of the theft-alarm horn relay

•

Malfunction of the ETACS-ECU

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:

•

MB991223: Test Harness Set

AC002299 AC

FUSIBLE LINK (1)

AC003128 AM

CONNECTOR: A-11X

THEFT-
ALARM
HORN
RELAY

BATTERY

AC003129 AF

CONNECTOR: A-23

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003082AQ

JUNCTION BLOCK
(FRONT VIEW)

CONNECTORS: C-77, C-81

C-81

C-77

AC003080AF

JUNCTION BLOCK
(REART VIEW)

CONNECTOR: C-85

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-174

STEP 1. Check the keyless entry system horn answerback.
Activate the keyless entry system horn answerback. (Refer to
GROUP 42, Keyless Entry System

−

On-vehicle Service

−

Enabling/disabling the Answerback Function

P.42-68

.)

Q: Does the horn answerback function work?

YES : Replace the ETACS-ECU. The horn should sound

when the theft-alarm system is triggered.

NO : Go to Step 2.

STEP 2. Check the theft-alarm horn.
Connect the battery as shown and check that the theft-alarm
horn sounds.

Q: Is the theft-alarm horn in good condition?

YES : Go to Step 3.
NO : Replace it. The horn should sound when the theft-

alarm system is triggered.

STEP 3. Check the theft-alarm horn relay.

Q: Is the theft-alarm horn relay in good condition?

YES : Go to Step 4.
NO : Replace it. The horn should sound when the theft-

alarm system is triggered.

STEP 4. Check the theft-alarm horn relay power supply
circuit at the theft-alarm horn relay connector A-11X.
(1)Disconnect the theft-alarm horn relay connector A-11X and

measure at the relay box side.

(2)Measure the voltages between terminals 3, 5 and ground.

Q: Are the voltages approximately 12 volts (battery

positive voltage)?
YES : Go to Step 7.
NO : Go to Step 5.

ACX02352

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

1

2

3

4

5

AC002148

CONNECTOR A-11X
(RELAY BOX SIDE)

AB