Mitsubishi Galant 9G. Manual — part 284

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-212

NOTE: Also check intermediate connector C-29 and junction
block connector C-216 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector C-29, 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).

AC305233

CONNECTOR: C-15

BG

C-105 (B)

HARNESS SIDE

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-213

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.

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.

AC305233BN

CONNECTOR: C-115

HARNESS SIDE

AC305415BC

CONNECTOR: C-202

JUNCTION BLOCK SIDE

JUNCTION BLOCK
(FRONT VIEW)

AC209862

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-214

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.

AC305233

HARNESS SIDE

BV

CONNECTOR: C-104

AC305233

HARNESS SIDE

BV

CONNECTOR: C-104

AC209364JD

CONNECTOR C-104
(HARNESS SIDE)

AC305233

HARNESS SIDE

BV

CONNECTOR: C-104

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-215

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.

AC305234

C-104

C-115

HARNESS SIDE

C-104

HARNESS SIDE

C-115

AR

CONNECTORS: C-104, C-115

AC305234

CONNECTORS: C-15, C-104

HARNESS SIDE

C-15

C-104

HARNESS SIDE

C-104

C-15 (B)

AS