Mitsubishi Montero (2002-2004). Manual — part 42
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-31
DIAGNOSIS
STEP 1. Check the rear heater switch (temperature control
switch).
Connect the tester between the connector terminal number 3
and number 5, between the terminal number 5 and number 13
and make sure that the resistance value changes slowly within
the standard value.
Standard value: 0
− 3 kΩ
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the rear air-conditioner switch.
AC204170
CONNECTOR : D-30
BC
AC204171
CONNECTOR : D-112
AU
AC204176
CONNECTORS : E-01, E-06, E-12
BP
E-12
E-01
E-06
AC204175
CONNECTOR : E-21
AJ
AC204179
CONNECTORS : G-23, G-25
AZ
G-23
G-25
AC204698 AT
G-25-1
G-25-2
CONNECTORS : G-25-1, G-25-2
AC205161
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-32
STEP 2. Measure the resistance at rear heater control unit
connector E-01.
(1) Disconnect rear heater control unit connector E-01, and
measure at the wiring harness side.
(2) Turn the rear fan switch to the "ON" position.
(3) Turn the rear fan control switch to the "OFF" position.
(4) Measure the resistance between terminal 13 and ground.
• The measured value should be 2 ohms or less.
Q: Does the measured resistance value correspond with
this range?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check rear heater control unit connector E-01 and
rear fan control switch connector E-12 for damage.
Q: Is rear heater control unit connector E-01 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.
AC204176
CONNECTOR : E-01
AU
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204738
7
8
3
10 9
2
4
11
1312
5
14
6
1
CG
HARNESS SIDE : E-01
AC204194
CONNECTORS : E-01, E-12
AL
E-01
E-01
E-12
HARNESS SIDE
E-12
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
1
4
2
3
5
6
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-33
STEP 4. Check the wiring harness between rear heater
control unit connector E-01 (terminal 13) and rear fan
control switch connector E-12 (terminal 1).
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 heater control unit
connector E-01 (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 heater control unit connector E-01 and
rear heater switch E-21 for damage.
Q: Is rear heater control unit connector E-01 and rear
heater switch E-21 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.
AC204194
CONNECTORS : E-01, E-06, E-12
AZ
E-01
E-01
E-12
HARNESS SIDE
HARNESS SIDE
E-12
E-06
E-06
7
8
3
10 9
2
4
11
1312
5
14
6
1
1
4
2
3
5
6
22
2021
10
9
8
1718
6 7
19
1415
4 5
1112
1 2 3
13
16
AC204176
CONNECTOR : E-01
AU
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204175
CONNECTOR : E-21
AF
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-34
STEP 6. Check the wiring harness between rear heater
control unit connector E-01 (terminal 3, 4 and 8) and rear
heater switch connector E-21 (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 heater control unit
connector E-01 (terminal 3, 4 and 8) and rear heater
switch connector E-21 (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-01
AU
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204175
CONNECTOR : E-21
AF
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
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