Mitsubishi Grandis. Manual — part 319

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-161

DIAGNOSIS

Step 1. Connector check: C-215 rear blower
motor connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector.

Step 2. Check the rear blower relay

Refer to

P.55-196

.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Replace the rear blower relay.

Step 3. Connector check: C-15 intermediate
connector

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the connector.

Step 4. Voltage measurement at C-15
intermediate connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

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

(3) Disconnect A/C-ECU connector C-104 and earth

terminal 56.

(4) Measure the voltage between terminal 1 and

body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Go to Step 5.

AC310618

Connector: C-215 <RHD>

AH

Junction block side

Junction block (Front view)

AC310628AE

Connector: C-15 <RHD>

AC310628AE

Connector: C-15 <RHD>

AC310631AH

Connector: C-104 <RHD>

Harness side

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

AC310507

Connector C-15

BE

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-162

Step 5. Voltage measurement at C-215 rear
blower relay connector.

(1) Remove the relay, and measure at the relay block

side.

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

(3) Voltage between terminal 3 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

Step 6. Check the wiring harness between C-215
rear blower relay connector terminal No.3 and
the ignition switch (IG2).

NOTE:

Prior to the wiring harness inspection, check junction
block connectors C-202, C-205 and joint connector
C-01, and repair if necessary.

• Check the rear blower relay power supply line for

open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the wiring harness.

AC310618

Connector: C-215 <RHD>

AH

Junction block side

Junction block (Front view)

AC310507BF

Connector C-215
(Junction block side)

AC310619

Connectors: C-202, C-205, C-215 <RHD>

AN

Junction block (Front view)

C-205

C-202

C-205

Harness side

C-202

Harness side

C-215

Junction block side

C-215

AC310631AE

Connector: C-01 <RHD>

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-163

Step 7. Voltage measurement at C-215 rear
blower relay connector.

(1) Remove the relay, and measure at the relay block

side.

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

(3) Voltage between terminal 4 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 8.

Step 8. Check the wiring harness between C-215
rear blower relay connector terminal No.4 and
the fusible link (30).

NOTE:

Prior to the wiring harness inspection, check
intermediate connector C-125 and junction block
connector C-201, and repair if necessary.

• Check the rear blower relay power supply line for

open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the wiring harness.

AC310618

Connector: C-215 <RHD>

AH

Junction block side

Junction block (Front view)

AC310507

Connector C-215
(Junction block side)

BG

AC310619

Connectors: C-201, C-215 <RHD>

AO

Junction block (Front view)

C-215

Harness side

C-201

C-201

Junction block side

C-215

AC310628AB

Connector: C-125 <RHD>

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-164

Step 9. Check the wiring harness between C-215
rear blower relay connector terminal No.2 and
C-104 A/C-ECU connector terminal No.56.

NOTE: Prior to the wiring harness inspection, check
junction block connector C-201, and repair if
necessary.

• Check the rear blower relay power supply line for

open circuit.

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Repair the wiring harness.

Step 10. Check the wiring harness between C-215
rear blower relay connector terminal No.4 and
C-15 intermediate connector terminal No.1.

NOTE: Prior to the wiring harness inspection, check
junction block connector C-201, and repair if
necessary.

• Check the rear blower relay power supply line for

open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the wiring harness.

AC310631AH

Connector: C-104 <RHD>

Harness side

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

AC310619

Connectors: C-201, C-215 <RHD>

AO

Junction block (Front view)

C-215

Harness side

C-201

C-201

Junction block side

C-215

AC310628AE

Connector: C-15 <RHD>

AC310619

Connectors: C-201, C-215 <RHD>

AO

Junction block (Front view)

C-215

Harness side

C-201

C-201

Junction block side

C-215