Mitsubishi Galant 9G. Manual — part 55

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-216

GENERAL CIRCUIT DIAGRAM FOR THE KEYLESS ENTRY SYSTEM

REAR DOOR
LOCK
ACTUATOR

(LH)

REAR DOOR
LOCK
ACTUATOR

(RH)

TRUNK LID
LATCH
ASSEMBLY

CIRCUIT
BREAKER

MOTOR

ETACS-
ECU

FRONT

DOOR

LOCK
ACTUATOR

(LH)

FRONT

DOOR

LOCK
ACTUATOR

(RH)

FRONT

DOOR

LOCK ACTUATOR

(RH)

FRONT

DOOR

LOCK ACTUATOR

(LH)

DOOR LOCK

KEY CYLINDER SWITCH

DATA LINK
CONNECTOR

FUSIBLE
LINK

1

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-217

ETACS-ECU

JUNCTION BLOCK

22

RELAY BOX
(FUSE )

22

RELAY BOX
(FUSE )

REAR COMBINATION
LIGHT (LH)

REAR COMBINATION
LIGHT (RH)

FRONT
COMBINATION
LIGHT (LH)

FRONT
COMBINATION
LIGHT (RH)

22

RELAY BOX
(FUSE )

COMBINATION
METER

CPU

FRONT
DOOR
SWITCH

(LH)

REAR
DOOR
SWITCH

(RH)

REAR
DOOR
SWITCH

(LH)

FRONT
DOOR
SWITCH

(RH)

RELAY BOX
(FUSE )

14

REAR DOME LIGHT

HORN
RELAY

HORN

HORN

RELAY BOX
(FUSE )

8

MAP LIGHT
ASSEMBLY
OVERHEAD
CONSOLE
ASSEMBLY

NOTE
: WITHOUT SUNROOF
: WITH SUNROOF

CONTROL CIRCUIT

TRANSMITTER

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-218

INSPECTION PROCEDURE E-1: Keyless Entry System: Keyless entry system does not operate.

.

CIRCUIT OPERATION

A receiver is incorporated in the ETACS-ECU. This
receiver receives a lock or unlock signal from the
transmitter.

.

TROUBLESHOOTING HINTS

• The RKE transmitter may be defective

• The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Verify the central door locking system.
Q: Does the central door locking system work normally?

YES : Go to Step 2.
NO : Refer to Inspection Procedure C-1 "The central door

locking system does not work at all

P.54B-137

."

ETACS-
ECU

RECEIVER

· TRANSMITTER"LOCK"SWITCH
· TRANSMITTER"UNLOCK"SWITCH

Transmitter ("LOCK"/"UNLOCK") Input Signal

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-219

STEP 2. Check the input signal (by using the pulse check
mode of the monitor).
Check input signals from the transmitter.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958.Refer to "How to connect

SWS monitor

P.54B-13

."

(2) Operate scan tool MB991958 according to the procedure

below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

(3) Push the transmitter "LOCK" or "UNLOCK" button.
(4) Check that scan tool MB991958 sounds
Q: When the transmitter "LOCK" or "UNLOCK" button is

turned ON, does scan tool MB991958 sound?
YES : Replace the ETACS-ECU. All the doors can be locked

or unlocked by means of the transmitter.

NO : Refer to Inspection Procedure N-8 "ETACS-ECU

does not receive any signal from the lock, unlock,
trunk or panic switch

P.54B-540

."

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827