Mitsubishi Lancer Evolution IX. Manual — part 536
![](/vehicles/winoney/wruvea/ger/keb.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-17
Code No.31: Air Mixing Damper Control Motor Potentiometer System
<LHD>
<RHD>
Air Mixing Damper Control Motor 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
A/C-ECU
AIR MIXING DAMPER
CONTROL MOTOR AND
POTENTIOMETER
Air Mixing Damper Control Motor 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
A/C-ECU
AIR MIXING DAMPER
CONTROL MOTOR AND
POTENTIOMETER
![](/vehicles/winoney/wruvea/ger/sofuska.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-18
COMMENTS ON TROUBLE SYMPTOM
This code is set when the air mixing damper control
motor potentiometer does not send any signal to the
A/C-ECU due to short or open circuit.
PROBABLE CAUSES
• Malfunction of the air mixing damper control
motor and potentiometer
• Damaged the wiring harness or connectors
• Malfunction of the automatic A/C control panel
(A/C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. Check the air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the air mixing damper control
motor and potentiometer.
STEP 2. Connector check: C-36 A/C-ECU
connector and C-144 air mixing damper control
motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504624AI
Connectors: C-36, C-144 <RHD>
Harness side
C-36
C-144
C-144
C-36 (B)
AC504617AL
Connector: C-144 <LHD>
Harness side
![](/vehicles/winoney/wruvea/ger/xpon.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-19
STEP 3. Check the wiring harness between C-36
A/C-ECU connector (terminals 10, 5 and 20) and
C-144 air mixing damper control motor and
potentiometer connector (terminals 2, 5 and 6).
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-10, and heater water tem-
perature sensor connector C-32 <RH drive vehi-
cles>, and repair if necessary.
• Check the potentiometer power supply, earth and
signal line 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.
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504624AQ
Connectors: C-10, C-32, C-36, C-144 <RHD>
Harness side
C-10
C-36
C-144
C-10
C-144
C-36 (B)
Harness side
C-32
C-32
Harness side
AC504701AC
Connectors: C-10, C-144 <LHD>
Harness side
C-10
C-144
C-144
C-10
![](/vehicles/winoney/wruvea/ger/jun.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-20
Code No.32: Mode Selection Damper Control Motor Potentiometer System
<LHD>
<RHD>
Mode Selection Damper Control Motor 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
MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER
A/C-ECU
Mode Selection Damper Control Motor 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
HEATER WATER
TEMPERATURE SENSOR
MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER
A/C-ECU
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