Mitsubishi Montero (2002-2004). Manual - part 40

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-23

STEP 3. Measure the voltage at rear heater control unit 
connector E-01 <vehicles with rear heater>, rear cooler 
control unit connector E-09 <vehicles with rear cooler> or 
rear A/C control unit connector E-20 <vehicles with rear A/
C>. 
(1) Disconnect rear heater control unit connector E-01 

<vehicles with rear heater> or rear cooler control unit 
connector E-09 <vehicles with rear cooler> or rear A/C 
control unit connector E-20 <vehicles with rear A/C> and 
measure the voltage at the harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 5 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 6.
NO :   Go to Step 4.

AC204194

CONNECTORS : E-01, E-09, E-20

AN

E-01,
E-09,
E-20

E-01 <VEHICLES WITH REAR HEATER>
E-09 <VEHICLES WITH REAR COOLER>
E-20 <VEHICLES WITH REAR A/C>

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC205149

7

8

3

10 9

2

4

11

1312

5

14

6

1

CONNECTOR E-01, E-09, E-20
(HARNESS SIDE)

AB

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-24

STEP 4. Check rear heater control unit connector E-01 
<vehicles with rear heater>, rear cooler control unit 
connector E-09 <vehicles with rear cooler> or rear A/C 
control unit connector E-20 <vehicles with rear A/C> for 
damage.
Q: Is rear heater control unit connector E-01 <vehicles with 

rear heater>, rear cooler control unit connector E-09 
<vehicles with rear cooler> or rear A/C control unit 
connector E-20 <vehicles with rear A/C> in good 
condition?
YES : Go to Step 5.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear air conditioning works normally.

AC204194

CONNECTORS : E-01, E-09, E-20

AN

E-01,
E-09,
E-20

E-01 <VEHICLES WITH REAR HEATER>
E-09 <VEHICLES WITH REAR COOLER>
E-20 <VEHICLES WITH REAR A/C>

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-25

STEP 5. Check the wiring harness between rear heater 
control unit connector E-01 (terminal 5) <vehicles with rear 
heater> or rear cooler control unit connector E-09 
(terminal 5) <vehicles with rear cooler> or rear A/C control 
unit connector E-20 (terminal 5) <vehicles with rear A/C> 
and the ignition switch (IG2).

AC204194

CONNECTORS : E-01, E-09, E-20

AN

E-01,
E-09,
E-20

E-01 <VEHICLES WITH REAR HEATER>
E-09 <VEHICLES WITH REAR COOLER>
E-20 <VEHICLES WITH REAR A/C>

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-26

NOTE: Also check joint connector (6) D-01, junction block con-
nectors D-210 and D-208. If joint connector (6) D-01, junction 
block connectors D-210 and D-208 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 heater control unit 

connector E-01 (terminal 5) <vehicles with rear heater> 
or rear cooler control unit connector E-09 (terminal 5) 
<vehicles with rear cooler> or rear A/C control unit 
connector E-20 (terminal 5) <vehicles with rear A/C> and 
the ignition switch (IG2) 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.

AC204170

CONNECTOR: D-01

AB

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

AC204191

CONNECTORS: D-208, D-210

D-208

AC

HARNESS SIDE

HARNESS SIDE

D-210

D-208

D-210

1

2

3

5

6

4

1

2

7 6

3

9

4

11

12

10

13

5

8