Mitsubishi Galant (2004+). Manual - part 744

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-115

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

AC305233BK

CONNECTORS: C-09, C-106

C-09 (B)

C-106

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-116

.

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-173

."

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-117

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

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-118

NOTE: Also check joint connector C-03, junction block connec-
tors C-211 and C-215 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate 
connector C-03, junction block connector C-211 or C-215 is 
damaged, repair or replace the connector as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between outside/inside air 

selection damper control motor connector C-106 
(terminal 1) and the ignition switch (IG2) in good 
condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Repair the wiring harness. Check that the 

outside/inside air selection damper control motor 
works normally.

AC305231BP

CONNECTOR: C-03

AC305416

CONNECTORS: C-211, C-215

JUNCTION BLOCK 
(FRONT VIEW)

C-215

C-211

HARNESS SIDE

C-211

HARNESS SIDE

C-215

AK