Mitsubishi Galant (2004+). Manual - part 262

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-239

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

Check the input signals from the following switches:

• Key reminder switch

• Hazard warning light switch

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) Check the switches (see table below) applicable for the 

input signal check are operated.

(4) Check scan tool MB991958 sounds or not.

Q: When the key reminder switch and the hazard warning 

light switch are operated, does scan tool MB991958 
sound in each case?
Buzzer of scan tool MB991958 sounds normally. : 

Replace the ETACS-ECU. Verify that the encrypted 
code can be registered in the transmitter.

Scan tool MB991958 does not sound when the ignition 
key is removed and reinserted : Refer to Inspection 

Procedure N-1 "ETACS-ECU does not receive any 
signal from the key reminder switch 

P.54B-518

."

Scan tool MB991958 does not sound when the hazard 
warning light switch is turned from "OFF" to "ON" : 

Refer to Inspection Procedure N-2 "ETACS-ECU 
does not receive any signal from the hazard warning 
light switch 

P.54B-523

."

ITEM NAME

CHECK CONDITION

Key reminder switch

Remove and reinsert the 
ignition key

Hazard warning light switch

Turn the hazard warning light 
switch from "OFF" to "ON" 
position.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-240

STEP 3. Check the transmitter.
Q: When the transmitter's battery is replaced, can the 

encrypted code be registered?
YES : No action is necessary and testing is complete.
NO :  Replace the transmitter. If the encrypted code cannot 

be registered using the new transmitter, replace the 
ETACS-ECU. Verify that the encrypted code can be 
registered in the transmitter.

INSPECTION PROCEDURE E-4: Keyless Entry System: The trunk is not opened when the keyless 
entry transmitter "TRUNK" button is operated.

ETACS-ECU

RECEIVER

TRANSMITTER"TRUNK"SWITCH

INPUT SIGNAL

JUNCTION BLOCK

TRUNK 
LID LATCH 
ASSEMBLY

CIRCUIT 
BREAKER

MOTOR

Transmitter "TRUNK" Input Signal

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-241

.

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

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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. Check that the doors can be locked and unlocked 
by using the keyless entry transmitter.
Q: Can the doors be locked and unlocked normally when 

the keyless entry transmitter is operated?
YES : Go to Step 2.
NO :  Refer to Inspection Procedure E-1 "Keyless entry 

system does not operate 

P.54B-229

."

AC305231BA

CONNECTOR: C-28

AC305413

CONNECTOR: C-217

AK

JUNCTION BLOCK

(REAR VIEW)

AC305260

AC

CONNECTOR: F-05

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-242

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 "TRUNK" button.
(4) Check that scan tool MB991958 sounds
Q: When the transmitter "TRUNK" button is turned ON, 

does scan tool MB991958 sound?
YES : Go to Step 3.
NO :  Refer to Inspection Procedure N-8 "ETACS-ECU 

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

P.54B-563

."

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827