Mitsubishi Montero (2004+). Manual - part 599

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-39

AC204170

CONNECTORS : D-01, D-30

CZ

D-01

D-30

AC204171

CONNECTOR : D-112

AU

AC204173

CONNECTORS : D-208, D-210

BF

D-208

D-210

AC204176

CONNECTORS : E-06, E-09, E-12

BJ

E-09

E-06

E-12

AC204175

CONNECTOR : E-17

AI

AC204179

CONNECTOR : G-13

AW

AC204698 AR

G-13-1

G-13-3

G-13-2

CONNECTORS : G-13-1, G-13-2, G-13-3

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-40

DIAGNOSIS

STEP 1. Check the rear cooler switch (temperature 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.

STEP 2. Measure the resistance at rear cooler control unit 
connector E-09.

(1) Disconnect rear cooler control unit connector E-09, 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.

AC205161

1
7

2
8

10 11

5

13

6

14

12

4

9

3

AC204176

CONNECTOR : E-09

AW

7

8

3

10 9

2

4

11

1312

5

14

6

1

HARNESS SIDE

AC204738

7

8

3

10 9

2

4

11

1312

5

14

6

1

CF

HARNESS SIDE : E-09

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-41

STEP 3. Check rear cooler control unit connector E-09 and 
rear fan control switch connector E-12 for damage.

Q: Is rear cooler control unit connector E-09 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 

P.00E-2

. Check 

that the air conditioning works normally.

STEP 4. Check the wiring harness between rear cooler 
control unit connector E-09 (terminal 13) and rear fan 

control switch connector E-12 (terminal 1).

AC204194

CONNECTORS : E-09, E-12

AR

E-09

E-12

E-12

HARNESS SIDE

1
4

2

3

5

6

E-09 <VEHICLES WITH REAR COOLER>

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204194

CONNECTORS : E-06, E-09, E-12

AQ

E-06

E-06

E-09

E-12

E-12

HARNESS SIDE

1
4

2

3

5

6

E-09 <VEHICLES WITH REAR COOLER>

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-42

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 

P.00E-2

.

Q: Is the wiring harness between rear cooler control unit 

connector E-09 (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 cooler control unit connector E-09 and 
rear cooler switch E-17 for damage.

Q: Is rear cooler control unit connector E-09 and rear 

cooler switch E-17 in good condition?
YES : Go to Step 6.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear air conditioning works normally.

AC204176

CONNECTOR : E-09

AW

7

8

3

10 9

2

4

11

1312

5

14

6

1

HARNESS SIDE

AC204175

CONNECTOR : E-17

AE

HARNESS SIDE

FLOOR 
COSOLE

1
7

2
8

10

11

5

13

6

14

12

4

9

3