Mitsubishi Montero (2004+). Manual — part 738

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-209

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.54B-379

."

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

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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.

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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

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

• MB991911: MUT-III Main Harness B

Encrypted Transmitter Code Circuit

SYMPTOM PROCEDURES

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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.54B-626

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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 MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Operate scan tool MB991958 as follows:

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

(3) Verify scan tool MB991958 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 MB991958
sound?
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 P-1 "ETACS-ECU does not receive a
signal from the key reminder switch

P.54B-545

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Scan tool MB991958 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.54B-549

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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.

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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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.42-63

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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

SYMPTOM PROCEDURES

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General circuit diagram regarding the sunroof