Mitsubishi Montero (2002-2004). Manual — part 255
SYMPTOM PROCEDURES
TSB Revision
SWS SYMPTOM PROCEDURES
54Bb-67
.
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 front door switches may be defective
• The column switch (turn-signal light and lighting
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
• MB991502: Scan Tool (MUT-II)
• MB991862: SWS monitor kit
STEP 1. Use scan tool MB991502 to select "ECU COMM
CHK" on the SWS monitor display.
Check the following ECUs:
• ETACS-ECU
• Column-ECU
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
(16-pin).
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991502 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."
(5) Scan tool MB991502 should show "OK" on the "ECU
COMM CHK" menus for both the "ETACS ECU" and the
"COLUMN ECU" menus.
Q: Is "OK" displayed on both the "ETACS ECU" and
"COLUMN ECU" menus?
"OK" are displayed for all the items : Go to Step 2.
"NG" is displayed on the "ETACS ECU" menu : Refer to
Inspection Procedure A-3 "Communication with
ETACS-ECU is not possible
."
"NG" is displayed on the "COLUMN ECU" menu : Refer
to Inspection Procedure A-2 "Communication with
column switch (column-ECU) is not possible
AC204222AB
16-pin
13-pin
MB991502
MB991862
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
54Bb-68
STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
• Ignition switch: OFF (key removed)
• Lighting switch: TAIL or HEAD
• Driver’s door: open
• Front passenger's door: closed
Operate scan tool MB991502 according to the procedure below
to display "LGT MONI. ALRM."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "BUZZER."
6. Select "LGT MONI. ALRM."
Check that normal conditions are displayed on the items
described in the table below.
Q: Are normal conditions displayed for "HEADLIGHT SW",
"TAILLIGHT SW", "IG SW IG1", "FRONT DOOR SW", "H/
L AUTO-CUT" and "BUZZER"?
YES : Replace the ETACS-ECU. The light reminder tone
alarm function should now work normally.
NO :
• Normal condition is not displayed on the
"HEADLIGHT SW": Refer to Inspection Procedure
O-6 "ETACS-ECU does not receive any signal
from the headlight switch
• Normal condition is not displayed on the
"TAILLIGHT SW": Refer to Inspection Procedure
O-6 "ETACS-ECU does not receive any signal
from the taillight switch
• Normal condition is not displayed on the "IG SW
IG1": Refer to Inspection Procedure O-2 "ETACS-
ECU does not receive any signal from the ignition
switch (IG1)
• Normal condition is not displayed on the "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
• Normal condition is not displayed on the "H/L
ITEM NO.
ITEM NAME
NORMAL
CONDITION
ITEM 00
HEADLIGHT SW
Either of items
is ON
ITEM 01
TAILLIGHT SW
ITEM 30
IG SW (IG1)
OFF
ITEM 32
FRONT DOOR SW
ON
ITEM 35
H/L AUTO-CUT
OFF
ITEM 43
BUZZER
ON
AC204222AB
16-pin
13-pin
MB991502
MB991862
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
54Bb-69
AUTO-CUT": Refer to Inspection Procedure J-9
"Headlight automatic shutdown function does not
work normally
• Normal condition is not displayed on the
"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 MB991502 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
.
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
Seat Belt Tone Alarm Function
SYMPTOM PROCEDURES
TSB Revision
SWS SYMPTOM PROCEDURES
54Bb-70
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991502: Scan Tool (MUT-II)
• MB991862: SWS monitor kit
STEP 1. Use scan tool MB991502 to select "ECU COMM
CHK" on the SWS monitor display.
Check the ETACS-ECU.
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
(16-pin).
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) When the ignition switch is turned to the "ON" position.
(4) Operate scan tool MB991502 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."
(5) Scan tool MB991502 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
AC204222AB
16-pin
13-pin
MB991502
MB991862
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