Mitsubishi Lancer Evolution IX. Manual — part 538
![](/vehicles/winoney/wruvea/ger/knea.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-25
STEP 3. Check the wiring harness between C-37
A/C-ECU connector (terminals 22 and 25) and
C-144 air mixing damper control motor and
potentiometer connector (terminals 3 and 1).
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-10, and repair if necessary.
• Check the motor activating lines for open or short
circuit.
Q: Is the check result normal?
YES :
Malfunction of the automatic A/C control
panel (A/C-ECU)
NO :
Repair the wiring harness.
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504624AN
Connectors: C-10, C-37, C-144 <RHD>
Harness side
C-10
C-37
C-144
C-10
C-144
C-37 (B)
Harness side
AC504701AC
Connectors: C-10, C-144 <LHD>
Harness side
C-10
C-144
C-144
C-10
![](/vehicles/winoney/wruvea/ger/kndast.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-26
Code No.42: Mode Selection Damper Control Motor and Potentiometer Activating System
COMMENTS ON TROUBLE SYMPTOM
This code is set when the mode selection damper
cannot be rotated to the preset opening angle.
PROBABLE CAUSES
• Malfunction of the mode selection 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. Check the mode selection damper
control motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the 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
A/C-ECU
MODE SELECTION DAMPER CONTROL
MOTOR AND POTENTIOMETER
![](/vehicles/winoney/wruvea/ger/juir.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-27
STEP 2. Connector check: C-37 A/C-ECU
connector and C-143 mode selection damper
control motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504624AO
Connectors: C-37, C-143 <RHD>
Harness side
C-37
C-143
C-143
C-37 (B)
AC504617AM
Connector: C-143 <LHD>
Harness side
![](/vehicles/winoney/wruvea/ger/enthesech.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-28
STEP 3. Check the wiring harness between C-37
A/C-ECU connector (terminals 21 and 24) and
C-143 mode selection damper control motor and
potentiometer connector (terminals 3 and 1).
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-10, and repair if necessary.
• Check the motor activating lines for open or short
circuit.
Q: Is the check result normal?
YES :
Replace the automatic A/C control panel
(A/C-ECU).
NO :
Repair the wiring harness.
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504624AP
Connectors: C-10, C-37, C-143 <RHD>
Harness side
C-10
C-37
C-143
C-10
C-143
C-37 (B)
Harness side
AC504701AD
Connectors: C-10, C-143 <LHD>
Harness side
C-10
C-143
C-10
C-143
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