Mitsubishi Lancer Evolution IX. Manual - part 546

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-57

STEP 4. Connector check: C-36 A/C-ECU 
connector and C-141 photo sensor connector.

Q:  Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair or replace the connector.

STEP 5. Check the wiring harness between C-141 
photo sensor connector (terminal 1, 2) and C-36 
A/C-ECU connector (terminal 19, 9).

• Check the photo sensor signal lines for open or 

short circuit.

Q: Is the check result normal?

YES : 

Replace the Photo sensor.

NO : 

Repair the wiring harness.

AC504641AE

Connectors: C-36, C-141 <LHD>

Harness side

C-36

C-141

C-141

C-36 (B)

AC504618AJ

Connector: C-36 <RHD>

Harness side

C-36 (B)

AC504625AG

Connector: C-141 <RHD>

Harness side

AC504641AE

Connectors: C-36, C-141 <LHD>

Harness side

C-36

C-141

C-141

C-36 (B)

AC504618AJ

Connector: C-36 <RHD>

Harness side

C-36 (B)

AC504625AG

Connector: C-141 <RHD>

Harness side

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-58

Inspection Procedure 7: The outside/inside air changeover is impossible.

COMMENTS ON TROUBLE SYMPTOM

When inside air cannot be changed to outside air 
vice versa even if its changeover switch is on, the 
outside/inside air selection damper control motor 
system may be defective.

PROBABLE CAUSES

• Malfunction of the outside/inside air selection 

damper control motor

• Damaged the wiring harness or connectors

• Malfunction of the automatic A/C control panel 

(A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-II/III actuator test
Carry out the actuator test. (Refer to 

P.55-101

)

• Item 13, 14: outside/inside air selection damper 

control motor

Q: Does the blower motor work normally?

YES : 

Replace the automatic A/C control panel 

(A/C-ECU)

NO : 

Go to Step 2.

Outside/Inside Air Selection Damper Control Motor 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

IGNITION 
SWITCH (IG2)

MOTOR DRIVE 
CIRCUIT

OUTSIDE/INSIDE AIR 
SELECTION DAMPER 
CONTROL MOTOR

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-59

STEP 2. Measure the voltage at C-07 
outside/inside air selection damper control motor 
connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

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

(3) Measure the voltage between terminal 7 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

STEP 3. Connector check: C-07 outside/inside air 
selection damper control motor connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connector.

AC504617AK

Connector: C-07 <LHD>

Harness side

AC504618AO

Connector: C-07 <RHD>

Harness side

AC301541KD

Connector C-07 
(Harness side)

AC504617AK

Connector: C-07 <LHD>

Harness side

AC504618AO

Connector: C-07 <RHD>

Harness side

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-60

STEP 4. Check the wiring harness between C-07 
outside/inside air selection damper control motor 
connector terminal No.7 and the ignition switch 
(IG2). 

NOTE: 

AC504701AB

Connectors: C-07, C-10 <LHD>

Harness side

C-07

C-10

C-07

C-10

AC504624AF

Connectors: C-07, C-10 <RHD>

Harness side

C-07

C-07

C-10

C-10

AC504622AI

Connector: C-101 <LHD>

C-101 (L)

AC504625AF

Connector: C-101 <RHD>

C-101 (L)

AC504633AF

Connectors: C-210, C-211 <LHD>

Harness side

Junction block (Front view)

C-210

C-211

C-211

C-210