Mitsubishi Montero (2004+). Manual — part 707

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-85

The scan tool does not show the respective normal
condition for item "FRONT DOOR SW" : Refer to

Inspection Procedure O-5 "ETACS-ECU does not
receive any signal from the driver's or the front
passenger's door switch

P.54B-520

."

The scan tool does not show the respective normal
condition for item "H/L AUTO-CUT" : Refer to Inspection

Procedure J-9 "Headlight automatic shutdown
function does not work normally

P.54B-363

."

The scan tool does not show the respective normal
condition for item "BUZZER" : Replace the ETACS-ECU.

The light reminder tone alarm function should now
work normally.

INSPECTION PROCEDURE B-3: Tone Alarm: Seat belt tone alarm function does not work normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-10

."

.

CIRCUIT OPERATION
The ETACS-ECU operates the seat belt tone alarm
function intermittently according to signals from the
following switches:

• Ignition switch (IG1): ON

• Driver's seat belt switch: ON

The ETACS-ECU operates the seat belt tone alarm
function intermittently under the following conditions:

• Ignition switch: ON or START

• Driver’s seat belt: UNFASTENED

.

TECHNICAL DESCRIPTION (COMMENT)
If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").

.

TROUBLESHOOTING HINTS

• The driver's seat belt switch 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.)

Seat Belt Tone Alarm Function

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-86

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

STEP 1. Use scan tool MB991958 to select "ECU COMM
CHK" on the SWS monitor display.

Check the ETACS-ECU.

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 the special tool. Refer to "How to connect SWS

monitor

P.54B-7

.

(2) When the ignition switch is turned to the "ON" position.
(3) Operate scan tool MB991958 according to the procedure

below to display "ECU COMM CHK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

(4) Scan tool MB991958 should show "OK" on the "ECU

COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication

with ETACS-ECU is not possible

P.54B-42

."

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-87

STEP 2. Check the input signal by using "DATA LIST"
menu of the SWS monitor.
Turn the ignition switch to the "ON" position before checking
input signals from the ignition switch (IG1).
Operate scan tool MB991958 according to the procedure below
to display "ETACS ECU."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."

Check that normal conditions are displayed on the items
described in the table below.

Q: Is normal condition displayed on the "IG SW (IG1)"?

YES : Go to Step 3.
NO : Refer to Inspection Procedure O-2 "ETACS-ECU

does not receive any signal from the ignition switch
(IG1)

P.54B-505

."

STEP 3. Check the input signal (by using the pulse check
mode of the monitor.)

Check input signal from the driver's side seat belt switch.
Operate scan tool MB991958 according to the procedure below
to display "PULSE CHECK."

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

• When the driver's seat belt is unfastened, check if scan tool

MB991958 sounds or not.

Q: Does scan tool MB991958 sound when the driver's side

seat belt is unfastened?
YES : Replace the ETACS-ECU. Verify that the seat belt

tone alarm function now works normally.

NO : Refer to Inspection Procedure P-3 "ETACS-ECU does

not receive any signal from the driver's side seat belt
switch

P.54B-553

."

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 30

IG SW (IG1)

ON

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-88

INSPECTION PROCEDURE B-4: Tone Alarm: RV meter operating sound function does not work
normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-10

."

.

CIRCUIT OPERATION
The ETACS-ECU sound a tone alarm when the RV
meter sends a sound request signal to the ECU.

.

TECHNICAL DESCRIPTION (COMMENT)
If this function does not work normally, the RV meter,
the ETACS-ECU or their communication circuit may
be defective.

.

TROUBLESHOOTING HINTS

• The RV meter 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

• MB991911: MUT-III Main Harness B

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

STEP 1. Check the RV meter.
Q: Does the RV meter work normally?

YES : Go to Step 2.
NO : Check the RV meter. Refer to GROUP 54A, RV meter

P.54A-249

.

RV Meter Annunciation Function