Mitsubishi Galant (2004+). Manual - part 752

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-147

STEP 9. Measure the resistance at blower relay connector 
C-202.

(1) Disconnect blower relay connector C-202, and measure the 

resistance at the wiring harness side.

(2) Measure the resistance value between terminal 3 and 

ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with 

this range?
YES :  Go to Step 11.
NO :   Go to Step 10.

STEP 10. Check the wiring harness between blower relay 
connector C-202 (terminal 3) and ground.

AC305415BC

CONNECTOR: C-202

JUNCTION BLOCK SIDE

JUNCTION BLOCK 
(FRONT VIEW)

AC209364

CONNECTOR C-202 
(JUNCTION BLOCK SIDE)

IS

AC305416

CONNECTORS: C-202, C-211

JUNCTION BLOCK 
(FRONT VIEW)

JUNCTION BLOCK SIDE

C-202

C-202

AO

HARNESS SIDE

C-211

C-211

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-148

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

P.00E-2

.

Q: Is the wiring harness between blower relay connector 

C-202 (terminal 3) and ground 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. The blower motor should 

operate normally.

STEP 11. Check blower switch connector C-14 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is blower switch connector C-14 in good condition?

YES : Go to Step 12.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

STEP 12. Check the blower switch continuity.

Follow the table below to check the blower switch for continuity.

Q: Is the blower switch continuity in good condition?

YES : Go to Step 13.
NO :  Replace the blower switch. The blower motor should 

operate normally.

AC305231BP

CONNECTOR: C-03

AC305233

HARNESS SIDE

BO

CONNECTOR: C-14

SWITCH 
POSITION

TESTER CONNECTION 
(CONNECTOR A) 

SPECIFIED 
CONDITION

0 (OFF)

1 

− 4, 2− 4, 4 − 5, 4 − 6

Open circuit

1 (LO)

1 

− 4

Less than 2 ohms

2 (ML)

4 

− 6

Less than 2 ohms

3 (MH)

2 

− 4

Less than 2 ohms

4 (HI)

4 

− 5

Less than 2 ohms

AC306526

1
3 4 5 6

2

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-149

STEP 13. Check the wiring harness between blower motor 
connector C-115 (terminal 1) and blower switch connector 
C-14 (terminal 5).

Q: Is the wiring harness between blower motor connector 

C-115 (terminal 1) and blower relay connector C-14 
(terminal 5) in good condition?
YES : Go to Step 14.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

AC305233

HARNESS SIDE

BO

CONNECTOR: C-14

AC305233BN

CONNECTOR: C-115

HARNESS SIDE

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-150

STEP 14. Check the wiring harness between blower switch 
connector C-14 (terminal 4) and blower relay connector 
C-202 (terminal 4).

NOTE: Also check junction block connector C-215 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector 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 blower switch connector 

C-14 (terminal 4) and blower relay connector C-202 
(terminal 4) 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. The blower motor should 

operate normally.

AC305233

HARNESS SIDE

BO

CONNECTOR: C-14

AC305416

CONNECTORS: C-202, C-215

JUNCTION BLOCK 
(FRONT VIEW)

C-215

HARNESS SIDE

C-215

JUNCTION BLOCK SIDE

C-202

C-202

AM