Mitsubishi Montero (2004+). Manual — part 532
SIDE STEP LIGHT
TSB Revision
CHASSIS ELECTRICAL
54A-97
STEP 7. Check the ground 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 resistance available at the harness side of the
connector.
(2) Measure the resistance value between terminal 12 and
ground.
• The resistance should equal 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Replace the side step light-ECU. Verify that the side
step light illuminate normally.
NO : Go to Step 8.
STEP 8. 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 9.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Verify that the side step light illuminate
normally.
STEP 9. Check the wiring harness between side step
light-ECU connector D-137 (terminal 7) and ground.
Q: Is the wiring harness between side step light-ECU
connector D-137 (terminal 7) and the ground 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.
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
1
2
8 7
4
5
10
11
12
6
9
3
AC204601
CONNECTOR D-137
(HARNESS SIDE)
AB
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
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
TSB Revision
CHASSIS ELECTRICAL
54A-98
INSPECTION PROCEDURE 2: One of the side step lights does not illuminate.
.
Side Step Light Circuit
AC204171
CONNECTOR : D-111
AG
AC204170
CONNECTORS : D-125, D-137
D-125
AW
D-137(GR)
AC204177
CONNECTOR : F-30
AI
F-30(B)
AC204178
CONNECTOR : F-31
AI
F-31(B)
SIDE STEP LIGHT
TSB Revision
CHASSIS ELECTRICAL
54A-99
TECHNICAL DESCRIPTION (COMMENT)
If one of the side step lights does not illuminate, the
light bulb or the side step light-ECU may be defec-
tive.
.
TROUBLESHOOTING HINTS
• The side step light bulb may be defective
• The side step light-ECU may be defective
• The side step light assembly 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 side step light operation.
Q: Which side step light does not illuminate?
LH (FRONT and REAR) : Go to Step 2.
RH (FRONT and REAR) : Go to Step 8.
LH (FRONT) : Go to Step 14.
LH (REAR) : Go to Step 15.
RH (FRONT) : Go to Step 16.
RH (REAR) : Go to Step 17.
STEP 2. Check the side step light operation.
(1) Disconnect side step light assembly (LH) connector F-31.
(2) When battery voltage is applied between the terminals,
check that the side step light (LH) illuminate.
Q: Is side step light (LH) illuminate?
YES : Go to Step 3.
NO : Replace the side step light harness. Verify that the
side step light illuminate normally.
1 2
AC204165
SIDE STEP
ASSEMBLY
AB
SIDE STEP LIGHT
TSB Revision
CHASSIS ELECTRICAL
54A-100
STEP 3. Check the ground circuit to the side step light
assembly (LH). Test at side step light assembly (LH)
connector F-31.
(1) Disconnect side step light assembly (LH) connector F-31
and measure the resistance available at the harness side of
the connector.
(2) Measure the resistance value between terminal 1 and
ground.
• The resistance should equal 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 4.
NO : Go to Step 6.
STEP 4. Check side step light-ECU connector D-137 and
side step light assembly (LH) connector F-31 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is side step light-ECU connector D-137 and side step
light assembly (LH) connector F-31 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Verify that the side step light illuminate
normally.
AC204178
CONNECTOR : F-31
AG
HARNESS SIDE
F-31(B)
F-31(B)
1
2
1
2
AC204602
CONNECTOR F-31
(HARNESS SIDE)
AB
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
AC204178
CONNECTOR : F-31
AG
HARNESS SIDE
F-31(B)
F-31(B)
1
2
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