Mitsubishi Montero (2004+). Manual — part 652
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-97
.
CIRCUIT OPERATION
If the defogger does not operate when the defogger
switch is turned on, the defogger relay system may
be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the A/C-ECU
• Malfunction of the flexible flat cable
• Malfunction of the automatic air-conditioning con-
trol panel
• Malfunction of the defogger relay
• Malfunction of the defogger
• Damaged harness wires or connectors
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 (Vehicles without
CAN communication system)
STEP 1. Check the A/C and outside/inside air selection
damper control motor operation.
Q: Do the A/C and outside/inside air selection damper
control motor work normally?
YES : Go to Step 2.
NO : Refer to Inspection procedure 10 "Malfunction of the
A/C-ECU power supply system
AC204173
CONNECTORS : D-208, D-209, D-211,
D-216, D-217
BM
D-208
D-216
D-217
D-209
D-211(B)
AC204179
CONNECTOR : G-10
AJ
AC204182 AL
E-01(B)
E-03(B)
CONNECTORS : I-01, I-03
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-98
STEP 2. Measure the voltage at defogger connector I-03.
(1) Disconnect defogger connector I-03, and measure the
voltage at the junction block side.
(2) Turn the defogger switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 18.
NO : Go to Step 3.
STEP 3. Check the defogger relay continuity.
Follow the table below to check the defogger relay for continu-
ity.
Q: Is the Defogger relay continuity in good condition?
YES : Go to Step 4.
NO : Replace the defogger relay. The defogger system
should work normally.
AC204182
CONNECTOR : I-03
AK
I-03(B)
1
HARNESS
SIDE
I-03(B)
AC204738 ES
JUNCTION BLOCK SIDE : I-03
1
BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
2
− 5
Open circuit
• Connect terminal 1 to
the positive battery
terminal
• Connect terminal 3 to
the negative battery
terminal
2
− 5
Less than 2
ohms
ACX01474
1
2
3
4
5
1
2
3
5
ACX01962
DEFOGGER
RELAY
AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-99
STEP 4. Measure the voltage at defogger relay connector
D-216.
(1) Disconnect defogger relay connector D-216, and measure
the voltage at the junction block side.
(2) Measure the voltage between terminal 2 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 7.
NO : Go to Step 5.
STEP 5. Check defogger relay connector D-216 for
damage.
Q: Is defogger relay connector D-216 in good condition?
YES : Go to Step 6.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
defogger system should work normally.
AC204173
CONNECTOR : D-216
BD
JUNCTION BLOCK
SIDE
1
2
5
4
3
AC204738
AC204738 DE
RELAY SIDE : D-216
1
2
5
4
3
AC204173
CONNECTOR : D-216
BD
JUNCTION BLOCK
SIDE
1
2
5
4
3
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-100
STEP 6. Check the wiring harness between defogger relay
connector D-216 (terminal 2) and the fusible link (2).
NOTE: Also check junction block connector D-211 and interme-
diate connector D-28. If junction block connector D-211 and
intermediate connector D-28 is damaged, repair or replace the
connector as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between defogger relay connector
D-216 (terminal 2) and the fusible link (2) in good
condition?
YES : Check that the defogger system works normally.
NO : Repair the wiring harness. Check that the defogger
system works normally.
AC204191
JUNCTION BLOCK
(FRONT VIEW)
CONNECTORS : D-211, D-216
D-211(B)
HARNESS SIDE
D-216
RELAY SIDE
AY
D-211(B)
D-216
1
2
5
4
3
1
AC204170
CONNECTOR : D-28
AI
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
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