Mitsubishi Montero (2004+). Manual — part 757
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-285
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-286
INSPECTION PROCEDURE I-1: Seat Belt Warning Light: Seat belt warning light does not illuminate.
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
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
ETACS-
ECU
· IGNITION SWITCH (IG1)
· DRIVER'S SEAT BELT SWITCH
INPUT SIGNAL
COMBINATION
METER
Seat Belt Warning Light Circuit
AC204170
CONNECTORS : D-03, D-04
BK
D-03(GR)
D-04(GR)
AC204173
CONNECTORS: D-208, D-210
D-208
D-210
AR
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-287
.
CIRCUIT OPERATION
• The ETACS-ECU operates the seat belt warning
light according to the following switch signals:
• Ignition switch (IG1)
• Driver's seat belt switch
• If the driver turn the ignition switch to the "ON"
position without fastening the seat belt, the seat
belt warning light illuminates.
.
TECHNICAL DESCRIPTION (COMMENT)
If the seat belt warning light does not illuminate, the
input circuit, the combination meter (seat belt warn-
ing light bulb or printed-circuit board) or the
ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
• The driver's side seat belt switch may be defec-
tive
• The combination meter (seat belt warning light
bulb or printed-circuit board) 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
AC204174
CONNECTOR : D-224
D-224(B)
AG
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-288
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
.
(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
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 "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)
AC309091
MB991911
MB991827
MB991824
AB
MB991806
MB991862
DATA LINK
CONNECTOR
(16-PIN)
DATA LINK
CONNECTOR
(13-PIN)
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)
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