Mitsubishi Galant (2004+). Manual - part 761

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-183

INSPECTION PROCEDURE 2: When the Air Outlet Changeover Control Knob is Moved to 
DEFROSTER or DEFROSTER/FOOT Position, the A/C or the Inside/outside Air Changeover Damper 
Motor does not operate.

.

TECHNICAL DESCRIPTION (COMMENT)
If the outside/inside air selection damper control 
motor does not operate normally, the inside/outside 
air changeover damper motor system may be defec-
tive.

.

TROUBLESHOOTING HINTS

• Malfunction of the A/C-ECU

• Malfunction of the outside/inside air selection 

damper control motor

• Damaged harness wires or connectors

DIAGNOSIS

Check operation of the outside/inside air selection damper 
control motor.
(1) Turn the ignition switch to the "ON" position.
(2) Outside/inside air selection damper motor switch: This is 

used to switch from the inside air to outside air or vice 
versa.

(3) Check to see that the outside/inside air selection damper 

motor operates normally.

Q: Does outside/inside air selection damper control motor 

work normally?
YES : Replace the A/C-ECU.
NO :  Refer to Inspection procedure 3, "Inside/outside air 

changeover is not possible 

P.55A-184

."

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-184

INSPECTION PROCEDURE 3: Outside/Inside Air Changeover is not possible.

A/C-ECU

OUTSIDE/INSIDE
AIR SELECTION
DAMPER CONTROL
MOTOR

IGNITION
SWITCH (IG2)

JUNCTION
BLOCK

JOINT
CONNECTOR (2)

MOTOR DRIVE
CIRCUIT

Outside/Inside air selection Motor Circuit

AC305231AZ

CONNECTOR: C-03

AC305233

CONNECTORS: C-15, C-106

C-106

C-15 (B)

BT

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-185

.

CIRCUIT OPERATION
If the outside/inside air selection damper control 
motor does not operate normally, the outside/inside 
air selection damper control motor system may be 
defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the outside/inside air selection 

damper control motor

• Malfunction of the A/C-ECU

• Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set

STEP 1. Check the defogger and A/C operations.
Q: Do the defogger and A/C work normally?

YES : Go to Step 2.
NO :  Refer to Inspection procedure 10 "Malfunction of the 

A/C-ECU power supply system 

P.55A-246

."

STEP 2. Check outside/inside air selection damper control 
motor connector C-106 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.

Q: Is outside/inside air selection damper control motor 

connector C-106 in good condition?
YES : Go to Step 3.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the outside/inside air selection damper control 
motor works normally.

AC305415

CONNECTORS: C-211, C-215

JUNCTION BLOCK 
(FRONT VIEW)

C-215

C-211

BA

AC305233

HARNESS SIDE

BJ

CONNECTOR: C-106

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-186

STEP 3. Measure the voltage at outside/inside air selection 
damper control motor connector C-106. 

(1) Disconnect outside/inside air selection damper control 

motor connector C-106, and measure the voltage at the 
harness side.

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

(3) Measure the voltage between terminal 1 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 5.
NO :   Go to Step 4.

STEP 4. Check the wiring harness between outside/inside 
air selection damper control motor connector C-106 

(terminal 1) and the ignition switch (IG2).

AC305233

HARNESS SIDE

BJ

CONNECTOR: C-106

AC209365

CONNECTOR C-106 
(HARNESS SIDE)

GR

AC305233

HARNESS SIDE

BJ

CONNECTOR: C-106