Mitsubishi Montero (2004+). Manual — part 646

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-73

STEP 13. Check the wiring harness between front blower
relay connector D-218 (terminal 5) and blower motor
connector D-113 (terminal 1).

NOTE: Also check junction block connector D-208. If junction
block connector D-208 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Is the wiring harness between front blower relay

connector D-218 (terminal 5) and blower motor
connector D-113 (terminal 1) in good condition?
YES : Replace the A/C-ECU (Refer to

P.55B-142

). The

blower motor should operate normally.

NO : Repair the wiring harness. The blower motor should

operate normally.

AC204171

CONNECTOR : D-113

AR

HARNESS
SIDE

1

2

AC204191

JUNCTION BLOCK
(FRONT VIEW)

AC204191

CONNECTORS : D-208, D-218

D-208

HARNESS SIDE

D-218

RELAY SIDE

AT

D-208

D-218

1

2

3

5

6

4

1

2

5

4

3

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-74

STEP 14. Check the blower motor.
Confirm whether the motor operates normally when the battery
voltage is applied between the blower motor terminals.
Q: Is the check result normal?

YES : Go to Step 15.
NO : Replace the blower motor. The blower motor should

operate normally.

STEP 15. Measure the voltage at heater blower controller
unit connector D-17.

(1) Disconnect heater blower controller unit connector D-17,

and measure the voltage at the wiring harness side.

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

(4) Measure the voltage between terminal 2 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 18.
NO : Go to Step 16.

STEP 16. Check heater blower controller unit connector
D-17 for damage.

Q: Is heater blower controller unit D-17 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.

AC001038 AB

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS
SIDE

AC204738 DA

HARNESS SIDE : D-17

1

2

3

4

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS
SIDE

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-75

STEP 17. Check the wiring harness between front blower
relay connector D-218 (terminal 5) and heater blower
controller unit connector D-17 (terminal 2).

NOTE: Also check junction block connector D-208. If junction
block connector D-208 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Is the wiring harness between front blower relay

connector D-218 (terminal 5) and heater blower
controller unit connector D-17 (terminal 2) in good
condition?
YES : The blower motor should operate normally.
NO : Repair the wiring harness. The blower motor should

operate normally.

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS
SIDE

AC204173

CONNECTOR : D-218

BE

JUNCTION BLOCK
SIDE

1

2

5

4

3

AC204173

CONNECTOR : D-208

HARNESS SIDE

AC

1

2

3

5

6

4

D-208

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-76

STEP 18. Measure the resistance at heater blower
controller unit connector D-17.
(1) Disconnect heater blower controller unit connector D-17,

and measure the resistance at the wiring harness side.

(2) Measure the resistance value between terminal 4 and

ground.

• 2 ohms or less

Q: Does the measured resistance value correspond with

this range?
YES : Go to Step 21.
NO : Go to Step 19.

STEP 19. Check heater blower controller unit connector
D-17 for damage.

Q: Is heater blower controller unit connector D-17 in good

condition?
YES : Go to Step 20.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. The

blower motor should operate normally.

STEP 20. Check the wiring harness between heater blower
controller unit connector D-17 (terminal 4) and ground.

Q: Is the wiring harness between heater blower controller

unit connector D-17 (terminal 4) and ground in good
condition?
YES : No action to be taken.
NO : Repair the wiring harness. The blower motor should

operate normally.

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS
SIDE

AC204738

HARNESS SIDE : D-17

DL

1

2

3

4

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS
SIDE

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS
SIDE