Mitsubishi 380. Manual - part 200

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-96

NOTE: Also check intermediate connector C-31 and junction 
block connector C-216 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate 
connector C-31, junction block connector C-216 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 5) and fusible link (1) in good condition?
YES : It can be assumed that this malfunction is intermittent. 

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

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Repair the wiring harness. The blower motor should 

operate normally.

STEP 9. Check the wiring harness between blower relay 
connector C-202 (terminal 3) and A/C-ECU connector C-15 
(terminal 9).

25DB092A

C-15

CONNECTOR: C-15

HARNESS SIDE

C-15

25DB115A

CONNECTORS: C-202, C-211

JUNCTION BLOCK 

(FRONT VIEW)

JUNCTION BLOCK SIDE

C-202

C-202

HARNESS SIDE

C-211

C-211

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-97

NOTE: Also check junction block connector C-211 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector C-211 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 A/C-ECU connector C-15 
(terminal 9) in good condition?
YES :  Go to Step 10.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

STEP 10. Check the wiring harness between blower motor 
connector C-115 (terminal 1) and blower relay connector 
C-202 (terminal 4).
Q: Is the wiring harness between blower motor connector 

C-115 (terminal 1) 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 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Repair the wiring harness. The blower motor should 

operate normally.

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

.

STEP 11. Check the blower fan and motor operation.
When battery voltage is applied between the terminals, check 
that the motor operates. Also, check that there is no abnormal 
noise.

Q: Is there any abnormal noise?

YES :  Go to Step 12.
NO :  Replace the blower relay. The blower motor should 

operate normally.

25DB110A

CONNECTOR: C-115

HARNESS SIDE

AC209862

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-98

STEP 12. Check blower power transistor connector C-104 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is power transistor connector C-104 in good condition?

YES : Go to Step 13.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

STEP 13. Measure the resistance at power transistor 
connector C-104.
(1) Disconnect power transistor connector C-104, and measure 

the resistance at the wiring harness side.

(2) Measure the resistance value between terminal 2 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 15.
NO :   Go to Step 14.

STEP 14. Check the wiring harness between power 
transistor connector C-104 (terminal 2) and ground.
Q: Is the wiring harness between power transistor 

connector C-104 (terminal 2) 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 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Repair the wiring harness. The blower motor should 

operate normally.

25DB116A

HARNESS SIDE

CONNECTOR: C-104

25DB116A

HARNESS SIDE

CONNECTOR: C-104

AC209364JD

CONNECTOR C-104 
(HARNESS SIDE)

25DB116A

HARNESS SIDE

CONNECTOR: C-104

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-99

STEP 15. Check the wiring harness between power 
transistor connector C-104 (terminal 4) and blower motor 
connector C-115 (terminal 2).
Q: Is the wiring harness between power transistor 

connector C-104 (terminal 4) and blower motor 
connector C-115 (terminal 2) in good condition?
YES :  Go to Step 16.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

STEP 16. Check the wiring harness between power 
transistor connector C-104 (terminals 1 and 3) and 
A/C-ECU connector C-15 (terminals 17 and 18).
Q: Are the wiring harness between power transistor 

connector C-104 (terminals 1 and 3) and A/C-ECU 
connector C-15 (terminals 17 and 18) in good condition?
YES :  Go to Step 17.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

25DB117A

C-104

C-115

HARNESS SIDE

C-104

HARNESS SIDE

C-115

CONNECTORS: C-104, C-115

25DB118A

CONNECTORS: C-15, C-104

HARNESS SIDE

C-15

C-104

HARNESS SIDE

C-104

C-15 (B)