Mitsubishi Montero (2004+). Manual — part 737
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-205
ETACS-
ECU
JUNCTION
BLOCK
BATTERY
FRONT
DOOR
SWITCH
(RH)
REAR
DOOR
SWITCH
(RH)
FRONT
DOOR
SWITCH
(LH)
REAR
DOOR
SWITCH
(LH)
REAR
PERSONAL
LIGHT
(LH) (RH)
CARGO
SPACE
LIGHT
CONTROL CIRCUIT
TRANSMITTER
THEFT-ALARM
HORN RELAY
THEFT-ALARM
HORN
RELAY
BOX
RELAY
BOX
DOME
LIGHT
BACK
DOOR
SWITCH
FRONT TURN
SIGNAL LIGHT (LH)
FRONT TURN
SIGNAL LIGHT (RH)
REAR COMBINATION LIGHT
(TURN SIGNAL LIGHT) (RH)
REAR COMBINATION LIGHT
(TURN SIGNAL LIGHT) (LH)
FUSIBLE LINK
1
COMBINATION
METER
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-206
INSPECTION PROCEDURE E-1: Keyless Entry System: Keyless entry system does not operate.
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"
.
CIRCUIT OPERATION
A receiver is incorporated in the ETACS-ECU. This
receiver receives a lock or unlock signal from the
transmitter.
.
TROUBLESHOOTING HINTS
• The transmitter may be defective
• The ETACS-ECU may be defective
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
Transmitter ("LOCK"/"UNLOCK") Input Signal
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-207
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) 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 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."
(5) 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 the pulse check
mode of the monitor.)
Check the input signals from the transmitter.
(1) Connect the special tool. Refer to "How to connect SWS
monitor
(2) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
(3) Push the transmitter "LOCK" or "UNLOCK" switch.
(4) Check that scan tool MB991958 sounds.
Q: When the transmitter "LOCK" or "UNLOCK" switch is
pushed, does scan tool MB991958 sound?
YES : Replace the ETACS-ECU. Verify that all the doors
can be locked or unlocked by using the transmitter.
NO : Refer to Inspection Procedure P-10 "The
ETACS-ECU does not receive a signal from the lock,
unlock switch or panic switch
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
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-208
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
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
."
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
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.
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."
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