Mitsubishi Montero (2004+). Manual — part 603
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-55
STEP 3. Check rear A/C control unit connector E-20 and
rear fan control switch connector E-12 for damage.
Q: Is rear A/C control unit connector E-20 and rear fan
control switch connector E-12 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
that the air conditioning works normally.
STEP 4. Check the wiring harness between rear A/C
control unit connector E-20 (terminal 13) and rear fan
control switch connector E-12 (terminal 1).
AC204194
CONNECTORS : E-12, E-20
AS
E-20
E-12
E-12
HARNESS SIDE
1
4
2
3
5
6
E-20 <VEHICLES WITH REAR A/C>
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204194
CONNECTORS : E-06, E-12, E-20
AP
E-06
E-06
E-20
E-12
E-12
HARNESS SIDE
1
4
2
3
5
6
E-20 <VEHICLES WITH REAR A/C>
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
22
2021
10
9
8
1718
6 7
19
1415
4 5
1112
1 2 3
13
16
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-56
NOTE: Also check intermediate connector E-06. If intermediate
connector E-06 is damaged, repair or replace the connector as
described in GROUP 00E, Harness Connector Inspection
.
Q: Is the wiring harness between rear A/C control unit
connector E-20 (terminal 13) and rear fan control switch
connector E-12 (terminal 1) in good condition?
YES : Check that the rear air conditioning works normally.
NO : Repair the wiring harness. Check that the rear air
conditioning works normally.
STEP 5. Check rear A/C control unit connector E-20 and
rear A/C switch E-22 for damage.
Q: Is rear A/C control unit connector E-20 and rear A/C
switch E-22 in good condition?
YES : Go to Step 6.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
that the rear air conditioning works normally.
AC204176
CONNECTOR : E-20
AY
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204175
CONNECTOR : E-22
AG
HARNESS SIDE
FLOOR
COSOLE
1
7
2
8
10
11
5
13
6
14
12
4
9
3
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-57
STEP 6. Check the wiring harness between rear A/C
control unit connector E-20 (terminal 3, 4 and 8) and rear
A/C switch connector E-22 (terminal 5, 3 and 13).
NOTE: Also check intermediate connector D-112. If intermedi-
ate connector D-112 is damaged, repair or replace the connec-
tor as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between rear A/C control unit
connector E-20 (terminal 3, 4 and 8) and rear A/C switch
connector E-22 (terminal 5, 3 and 13) in good condition?
YES : Go to Step 7.
NO : Repair the wiring harness. Check that the rear air
conditioning works normally.
AC204176
CONNECTOR : E-20
AY
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204175
CONNECTOR : E-22
AG
HARNESS SIDE
FLOOR
COSOLE
1
7
2
8
10
11
5
13
6
14
12
4
9
3
AC204171 AL
CONNECTOR : D-112
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
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-58
STEP 7. Check the air mixing damper control motor and
potentiometer
CAUTION
Do not apply battery voltage when the damper is in the
MAX HOT/MAX COOL position.
Check the air mixing damper control motor by the following pro-
cedures.
When checking the air mixing damper control motor, measure
the resistance value between the terminals 3 and 5, between
the terminals 3 and 7. At this time, make sure that the mea-
sured resistance value changes slowly within the standard
value.
Standard value: 1.2
− 4.8 kΩ
Q: Does air mixing damper control motor work normally?
YES : Go to Step 8.
NO : Replace the air mixing damper control motor. Check
that the rear air conditioning works normally.
LEVER
POSITION
BATTERY
CONNECTION
LEVER
OPERATION
At the MAX
COOL position
• Connect terminal 1
to the positive
battery terminal
• Connect terminal 2
to the negative
battery terminal
The lever moves
from the MAX
COOL position to
the MAX HOT
position
At the MAX
HOT position
• Connect terminal 2
to the positive
battery terminal
• Connect terminal 1
to the negative
battery terminal
The lever moves
from the MAX HOT
position to the MAX
COOL position
AC001049AB
MAX HOT POSITION
MAX
COOL
POSITION
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