Mitsubishi Montero (2002-2004). Manual - part 290

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

54Bb-207

INSPECTION PROCEDURE E-2: Keyless Entry System: The dome light, hazard warning lights (turn-
signal lights) and horn do not operate through the answerback function.

.

CIRCUIT OPERATION
The ETACS-ECU operates the following functions 
when it receives a lock or unlock signal from the 
transmitter:

• Dome light answerback function

• Hazard warning lights answerback function

• Horn answerback function

.

TECHNICAL DESCRIPTION (COMMENT)
The hazard warning lights or horn answerback func-
tions can be disabled. However, the dome light 
answerback function can be disabled.

.

TROUBLESHOOTING HINTS

• The hazard warning lights (turn-signal lights) may 

be defective

• The horn may be defective

• The dome light may be defective

• The ETACS-ECU may be defective

• The wiring harness may be damaged or the con-

nector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the con-
nector

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II) 

STEP 1. Verify the keyless entry system.
Q: Does the keyless entry system work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure E-1 "Keyless entry 

system does not work 

P.54Bb-205

."

STEP 2. Verify the answerback adjustment function.
Check the answerback functions. (Refer to GROUP 42, Key-
less Entry System 

− On-vehicle Service − Enabling/disabling 

the Answerback Function 

P.42-55

.)

Q: Does the answerback function work normally?

YES : No action is necessary and testing is complete.
NO :  Go to Step 3.

STEP 3. Verify the trouble symptom.
Q: Which answerback function is defective?

Only the dome light  : Go to Step 4.
Only the hazard warning lights (turn-signal lights) : Go 

to Step 5.

All functions do not work [dome light, hazard warning 
lights (turn-signal lights) and horn]. : Replace the 

ETACS-ECU. Verify that the answerback functions 
work normally.

SYMPTOM PROCEDURES

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STEP 4. Verify the dome light.
Q: Does the dome light illuminate normally?

YES : Replace the ETACS-ECU. Verify that the answerback 

functions work normally.

NO :  Refer to Inspection Procedure M-1 "The dome light do 

not illuminate or go out normally."

P.54Bb-450

STEP 5. Verify the hazard warning light.
Q:  Do the hazard warning lights work normally?

YES : Replace the ETACS-ECU. Verify that the answerback 

functions work normally.

NO :  Refer to Inspection Procedure K-2 "Hazard warning 

lights do not illuminate 

P.54Bb-399

."

INSPECTION PROCEDURE E-3: Keyless Entry System: Encrypted code cannot be registered

.

CIRCUIT OPERATION
The ETACS-ECU operates the encrypted code regis-
ter mode according to the following signals:

• Key reminder switch

• Hazard warning light switch

.

TECHNICAL DESCRIPTION (COMMENT)
If the encrypted code register mode can not be set, 
the input circuits from the key reminder switch, haz-
ard warning light switch or the ETACS-ECU may be 
defective.

If the encrypted code register mode can be set but 
the transmitter can not be registered, the transmitter 
or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The key reminder switch may be defective

• The hazard warning light switch may be defective

• The transmitter may be defective

• The ETACS-ECU may be defective

• The wiring harness may be damaged or the con-

nector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the con-
nector

Encrypted Transmitter Code Circuit

SYMPTOM PROCEDURES

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II) 

STEP 1. Verify the trouble symptom.
Q: Can the encrypted code register mode be set?

YES : Refer to Inspection Procedure P-10 "ETACS-ECU 

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

P.54Bc-145

."

NO :  Go to Step 2.

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 MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Operate scan tool MB991502 as follows:

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

(3) Verify scan tool MB991502 sounds or not.
(4) If the switches (see table below), which are applicable for 

the input signal check, are operated.

Q: When the key reminder switch and the hazard warning 

light switch are operated, does scan tool MB991502 
sound?
YES : Replace the ETACS-ECU. Verify that the encrypted 

code can be registered in the transmitter.

NO : 

• Scan tool MB991502 does not sound when the 

ignition key is removed and reinserted: Refer to 
Inspection Procedure P-1 "ETACS-ECU does not 
receive a signal from the key reminder switch 

P.54Bc-49

."

• Scan tool MB991502 does not sound when the 

hazard warning light switch is turned from "OFF" 
to "ON": Refer to Inspection Procedure P-2 
"ETACS-ECU does not receive a signal from the 
hazard warning light switch 

P.54Bc-53

."

ITEM NAME

CHECK CONDITIONS

Key reminder switch Insert and remove the ignition key

Hazard warning 
light switch

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

AC101570AB

MB991502

16 PIN

COLUMN

SWITCH

CONNECTOR

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SUNROOF

GENERAL DESCRIPTION CONCERNING THE SUNROOF

M1549021200074

The following ECUs affect the functions and control 
of the sunroof.

Sunroof timer function
After the ignition switch is turned OFF, the system continues to 
turn ON the sunroof relay for about 30 seconds and to enable 
the opening and closing of the sunroof by the sunroof switch. 
When the driver's or front passenger’s door is opened while the 
timer is in operation, the sunroof relay will be turned OFF and 
the sunroof timer function will be finished. As for the sunroof 
functions, refer to GROUP 42 

− Sunroof 

P.42-58

.

FUNCTION

CONTROL ECU

Sunroof timer function

ETACS-ECU, sunroof motor assembly

AC005433AG

ON

OFF

ON

OFF

ON 

(OPEN)

OFF 

(CLOSED)

IGNITION 

SWITCH (IG1)

SUNROOF RELAY

DOOR SWITCH

t

t: 30 seconds

t