Mitsubishi Montero (2002-2004). Manual — part 478
SIDE STEP LIGHT
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CHASSIS ELECTRICAL
54A-83
.
TECHNICAL DESCRIPTION (COMMENT)
If all of the side step light do not illuminate the side
step light-ECU may be defective.
.
TROUBLESHOOTING HINTS
• The side step light-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 Tool:
• MB991223: Harness Set
STEP 1. Check the battery power supply circuit to the side
step light-ECU. Test at side step light-ECU connector D-
137.
(1) Disconnect side step light-ECU connector D-137 and
measure the voltage available at the harness side of the
connector.
(2) Measure the voltage between terminal numbers 1 and
ground.
• The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 4.
NO : Go to Step 2.
AC204173
CONNECTORS : D-209, 221
AL
D-209
D-221
AC204170
CONNECTOR : D-137
HARNESS SIDE
D-137(GR)
D-137(GR)
AR
1
2
8 7
4
5
10
11
12
6
9
3
AC204599
1
2
8 7
4
5
10
11
12
6
9
3
CONNECTOR D-137
(HARNESS SIDE)
AB
SIDE STEP LIGHT
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CHASSIS ELECTRICAL
54A-84
STEP 2. Check side step light-ECU connector D-137 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is side step light-ECU connector D-137 in good
condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Verify that the side step light illuminate
normally.
AC204170
CONNECTOR : D-137
HARNESS SIDE
D-137(GR)
D-137(GR)
AR
1
2
8 7
4
5
10
11
12
6
9
3
SIDE STEP LIGHT
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CHASSIS ELECTRICAL
54A-85
STEP 3. Check the wiring harness between side step light-
ECU connector D-137 (terminal 1) and the fusible link (1).
ACX02274
FUSIBLE LINK (1)
AE
BATTERY
AC204188
CONNECTORS : D-28, D-137
D-137(GR)
AO
HARNESS SIDE
D-137(GR)
D-28
D-28
1
2
8 7
4
5
10
11
12
6
9
3
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
SIDE STEP LIGHT
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CHASSIS ELECTRICAL
54A-86
NOTE: Also check intermediate connector D-28, junction block
connectors D-209 and D-221 for loose, corroded, or damaged
terminals, or terminals pushed back in the connector. If inter-
mediate connector D-28, junction block connectors D-209 or D-
221 is damaged, repair or replace the connector as described
in GROUP 00E, Harness Connector Inspection
Q: Is the wiring harness between side step light-ECU
connector D-137 (terminal 1) and the fusible link (1) in
good condition?
YES : Replace the side step light-ECU. Verify that the side
step light illuminate normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the side step light illuminate normally.
STEP 4. Check the ignition switch (IG1) circuit to the side
step light-ECU. Test at side step light-ECU connector D-
137.
(1) Disconnect side step light-ECU connector D-137 and
measure the voltage available at the harness side of the
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal numbers 2 and
ground.
• The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 7.
NO : Go to Step 5.
AC204191
CONNECTORS : D-209, D-221
D-209
AF
HARNESS SIDE
HARNESS SIDE
D-221
D-209
D-221
3
1
4
6 5
7
8
2
1
2
6
7
9
3
4
11
12
10
5
13
8
AC204170
CONNECTOR : D-137
HARNESS SIDE
D-137(GR)
D-137(GR)
AR
1
2
8 7
4
5
10
11
12
6
9
3
AC204600
1
2
8 7
4
5
10
11
12
6
9
3
CONNECTOR D-137
(HARNESS SIDE)
AB
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