Mitsubishi Montero (2002-2004). Manual — part 311
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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.
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
AC204174
CONNECTOR : D-224
D-224(B)
AG
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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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
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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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 MB991502 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)
."
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 MB991502 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 fastened, check if scan tool
MB991502 sounds or not.
Q: Does scan tool MB991502 sound when the driver's side
seat belt is fastened?
Yes : Go to Step 4.
No : Refer to Inspection Procedure P-3 "ETACS-ECU does
not receive any signal from the driver's side seat belt
switch
ITEM NO.
ITEM NAME
NORMAL CONDITION
ITEM 30
IG SW (IG1)
ON
AC204222AB
16-pin
13-pin
MB991502
MB991862
AC204222AB
16-pin
13-pin
MB991502
MB991862
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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STEP 4. Check at ETACS-ECU connector D-224 in order to
check the ground circuit to the seat belt warning light.
(1) Disconnect ETACS-ECU connector D-224, and measure at
the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Connect terminal 39 to ground.
Q: Does the seat belt warning light illuminate?
YES : Replace the ETACS-ECU. Verify that the seat belt
warning light illuminates normally.
NO : Go to Step 5.
STEP 5. Check the seat belt warning light bulb.
Q: Is the seat belt warning light bulb in good condition?
YES : Go to Step 6.
NO : Replace the bulb. Verify that the seat belt warning
light illuminates normally.
STEP 6. Check the combination meter (printed-circuit
board).
(1) Remove the combination meter.
(2) Remove the seat belt warning light bulb. Then measure the
resistance value between the bulb terminals.
(3) Install the bulb to the combination meter, and then measure
the resistance value between connector D-04 terminal 32
and connector D-03 terminal 62. The measured resistance
value should be roughly the same as the value measured in
Step (2).
Q: Are these two resistance values extremely different?
YES : Repair or replace the combination meter (printed
circuit board). Verify that the seat belt warning light
illuminates normally.
NO (much the same) : Go to Step 7.
AC204174
CONNECTOR : D-224
AD
D-224(B)
D-224(B)
HARNESS SIDE
21
23
24
22
32
3433
31
26
27
28
3029
38
39
40
36
37
25
35
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
ACX01582AB
CONNECTOR D-224
(HARNESS SIDE)
ACX02344 AB
SEAT BELT WARNING LIGHT
66
65
64
63
62
61
52
51
59
67
58
57
56
55
54
53
60
46
45
44
43
42
41
32
31
39
47
38
37
36
35
34
33
40
ACX02366
CONNECTOR D-03
CONNECTOR D-04
AB
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