Mitsubishi Montero (2002-2004). Manual - part 55

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-83

STEP 15. Measure the resistance at rear heater switch 
connector E-21 <vehicles with rear heater>, rear cooler 
switch connector E-17 <vehicles with rear cooler> or rear 
A/C switch connector E-22 <vehicles with rear A/C>.
(1) Disconnect connector E-21 or E-17 or E-22 and measure 

the resistance at the wiring harness side. 

(2) Measure the resistance value between terminal 2 and 

ground.

• Less than 2 ohms

Q: Does the measured resistance value correspond with 

this range?
YES :  Go to Step 16.
NO :   Go to Step 18.

AC204193

CONNECTORS : E-17, E-21, E-22

AC

E-17, E-21, E-22

E-17 <VEHICLES WITH REAR COOLER>
E-21 <VEHICLES WITH REAR HEATER>
E-22 <VEHICLES WITH REAR A/C>

HARNESS SIDE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

AC204738 CK

HARNESS SIDE : E-17, E-21, E-22

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-84

STEP 16. Check rear fan control switch connector E-12 
and rear heater switch connector E-21 <vehicles with rear 
heater> or rear cooler switch connector E-17 <vehicles 
with rear cooler> or rear A/C switch connector E-22 
<vehicles with rear A/C> for damage.
Q: Is rear fan control switch connector E-12 and rear 

heater switch connector E-21 <vehicles with rear 
heater> or rear cooler switch connector E-17 <vehicles 
with rear cooler> or rear A/C switch connector E-22 
<vehicles with rear A/C> in good condition?
YES : Go to Step 17.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

blower motor should operate normally.

AC204176

CONNECTOR : E-12

AX

HARNESS SIDE

1
4

2

3

5

6

AC204193

CONNECTORS : E-17, E-21, E-22

AC

E-17, E-21, E-22

E-17 <VEHICLES WITH REAR COOLER>
E-21 <VEHICLES WITH REAR HEATER>
E-22 <VEHICLES WITH REAR A/C>

HARNESS SIDE

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-85

STEP 17. Check the wiring harness between rear fan 
control switch connector E-12 (terminal 2) and rear heater 
switch connector E-21 (terminal 8) <vehicles with rear 
heater> or rear cooler switch connector E-17 (terminal 8) 
<vehicles with rear cooler> or rear A/C switch connector E-
22 (terminal 8) <vehicles with rear A/C>.

AC204194

CONNECTORS : E-06, E-12

AO

E-06

E-06

E-12

E-12

HARNESS SIDE

1
4

2

3

5

6

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

AC204193

CONNECTORS : E-17, E-21, E-22

AC

E-17, E-21, E-22

E-17 <VEHICLES WITH REAR COOLER>
E-21 <VEHICLES WITH REAR HEATER>
E-22 <VEHICLES WITH REAR A/C>

HARNESS SIDE

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-86

NOTE: Also check intermediate connector E-06 and D-112. If 
intermediate connector E-06 or D-112 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between rear fan control switch 

connector E-12 (terminal 2) and rear heater switch 
connector E-21 (terminal 8) <vehicles with rear heater> 
or rear cooler switch connector E-17 (terminal 8) 
<vehicles with rear cooler> or rear A/C switch connector 
E-22 (terminal 8) <vehicles with rear A/C> in good 
condition?
YES : The rear blower motor should operate normally.
NO :  Repair the wiring harness. The rear blower motor 

should operate normally.

STEP 18. Check rear heater switch connector E-21 
<vehicles with rear heater>, rear cooler switch connector 
E-17 <vehicles with rear cooler> or rear A/C switch 
connector E-22 <vehicles with rear A/C> for damage.
Q: Is rear heater switch connector E-21 <vehicles with rear 

heater>, rear cooler switch connector E-17 <vehicles 
with rear cooler> or rear A/C switch connector E-22 
<vehicles with rear A/C> in good condition?
YES : Go to Step 19.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

blower motor should operate normally.

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

AC204193

CONNECTORS : E-17, E-21, E-22

AC

E-17, E-21, E-22

E-17 <VEHICLES WITH REAR COOLER>
E-21 <VEHICLES WITH REAR HEATER>
E-22 <VEHICLES WITH REAR A/C>

HARNESS SIDE

1
7

2
8

10

11

5

13

6

14

12

4

9

3