Mitsubishi L200. Manual - part 872

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-17

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code set?

YES : 

Replace the automatic A/C control panel (A/

C-ECU).

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

Code No.B1045: Motor drive system for the air mixing damper <RHD>

A/C-ECU

AIR MIXING DAMPER CONTROL
MOTOR AND POTENTIOMETER

Air Mixing Damper Control Motor And Potentiometer Circuit 

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

MOTOR DRIVE 
CIRCUIT

DIAGNOSIS CODE SET CONDITION
This code is set when the air mixing damper cannot 
be rotated to the preset opening angle.

POSSIBLE CAUSES

• Malfunction of the air mixing damper control 

motor and potentiometer

• Malfunction of the automatic A/C control panel (A/

C-ECU)

• Damaged the wiring harness or connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-09 A/C-ECU 
connector and C-49 air mixing damper control 
motor and potentiometer connector

AC509932 DS

Harness side

C-49 (B)

C-49

C-09

C-09 (GR)

Connectors: C-09, C-49

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-18

STEP 2. Check the wiring harness between C-09 
A/C-ECU connector (terminals 12 and 1) and C-49 
air mixing damper control motor and 
potentiometer connector (terminals 1 and 3).

AC509932 DS

Harness side

C-49 (B)

C-49

C-09

C-09 (GR)

Connectors: C-09, C-49

• Check the motor activating lines for open and 

short circuit.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the wiring harness.

STEP 3. Check the air mixing damper control 
motor and potentiometer.
Refer to 

P.55B-97

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the air mixing damper control 
motor and potentiometer.

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code set?

YES : 

Replace the automatic A/C control panel (A/

C-ECU).

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

Code No. B1061,B1062: Potentiometer system for Mode Selection Damper

A/C-ECU

MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER

Mode Selection Damper Control Motor And Potentiometer Circuit 

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

AC900623

COMMENTS ON TROUBLE SYMPTOM
This code is set when the mode selection damper 
control motor potentiometer does not send any sig-
nal to the A/C-ECU due to short or open circuit.

PROBABLE CAUSES

• Malfunction of the mode selection damper control 

motor and potentiometer

• Damaged the wiring harness or connectors

• Malfunction of the automatic A/C control panel (A/

C-ECU)

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-19

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-44 A/C-ECU 
connector and C-38 mode selection damper 
control motor and potentiometer connector

AC509613BA

C-38 (B)

Harness side

Connector: C-38 <LHD>

AC509930 AZ

C-38 (B)

Harness side

Connector: C-38 <RHD>

AC509611BM

Harness side

Connector: C-44 <LHD>

AC509932BU

Harness side

Connector: C-44 <RHD>

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

STEP 2. Check the wiring harness between C-44 
A/C-ECU connector (terminals 34, 32 and 38) and 
C-38 mode selection damper control motor and 
potentiometer connector (terminals 6, 2 and 5).

AC509613BA

C-38 (B)

Harness side

Connector: C-38 <LHD>

AC509930 AZ

C-38 (B)

Harness side

Connector: C-38 <RHD>

AC509611BM

Harness side

Connector: C-44 <LHD>

AC509932BU

Harness side

Connector: C-44 <RHD>

• Check the potentiometer power supply, earth and 

signal line for open and short circuit.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the wiring harness.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-20

STEP 3. Check the mode selection damper 
control motor and potentiometer.
Refer to 

P.55B-97

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the mode selection damper control 
motor and potentiometer.

STEP 4. M.U.T.-III diagnosis code

Q: Is the diagnosis code set?

YES : 

Replace the automatic A/C control panel (A/

C-ECU).

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction )

Code No. B1065: Motor drive system for mode selection damper

A/C-ECU

MODE SELECTION DAMPER CONTROL
MOTOR AND POTENTIOMETER

Mode Selection Damper Control Motor And Potentiometer Circuit 

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

MOTOR DRIVE 
CIRCUIT

AC806070

A/C-ECU

MODE SELECTION DAMPER CONTROL
MOTOR AND POTENTIOMETER

Mode Selection Damper Control Motor And Potentiometer Circuit 

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

MOTOR DRIVE 
CIRCUIT

AC806070AB

COMMENTS ON TROUBLE SYMPTOM
This code is set when the mode selection damper 
cannot be rotated to the preset opening angle.

POSSIBLE CAUSES

• Malfunction of the rear mode selection damper 

control motor and potentiometer

• Malfunction of the automatic A/C control panel (A/

C-ECU)

• Damaged the wiring harness or connectors