Mitsubishi Grandis. Manual - part 311

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-129

Step 2. MUT-III actuator test

Carry out the actuator test. (Refer to 

P.55-186

.)

• Item 04: Rear blower fan: OFF

• Item 05: Rear blower fan: AUTO <vehicles with 

dual automatic A/C>

• Item 06: Rear blower fan: Lo

• Item 07: Rear blower fan: Middle

• Item 08: Rear blower fan: High

Q: Does the rear blower motor work normally?

YES : 

Go to Step 3.

NO : 

Go to Step 9.

Step 3. MUT-III data list

Check that the following service data display 
contents are normal. (Refer to 

P.55-183

.)

• Item 22: Rear blower fan

• Item 23: Rear blower fan (Target)

• Item 31: Rear fan SW (Front)

• Item 32: Rear control OFF switch

• Item 33: Rear control fan OFF switch

Q:  Is the check result normal?

YES : 

Go to Step 8.

NO <Item 22, 23, 32, 33 is abnormal> : 

Go to Step 

4.

NO <Item 31 is abnormal> : 

Refer to Inspection 

Procedure 20: rear fan switch system 
<LHD>

P.55-146

  or Inspection Procedure 

21: rear fan switch system <RHD>

P.55-149

 

.

Step 4. Connector check: E-03 rear heater 
controller connector

Q:  Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector.

STEP 5. Check the rear heater controller

 Refer to 

P.55-213

.

Q:  Is the check result normal?

YES : 

Go to Step 6.

NO : 

Replace the rear heater controller.

AC310649

AB

Connector: E-03 <LHD>             

Harness side

AC310653

AB

Connector: E-03 <RHD>             

Harness side

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-130

Step 6. Connector check: C-104 A/C-ECU

Q:  Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the connector.

AC310613

AK

Connector: C-104 <LHD>

Harness side

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

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

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-131

Step 7. Check the wiring harness between E-03 
rear heater controller connector (terminals 4, 5, 
6, 7, 8 and 9) and C-104 A/C-ECU connector 
(terminals 70, 69, 68, 67, 66 and 65).

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-132

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-128, and repair if 
necessary.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. Recheck the trouble symptom

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 : 

Replace the A/C-ECU.

AC310614

AN

Connectors: C-104, C-128 <LHD>

Harness side

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

C-104

C-128

C-104

C-128

AC310632AI

Connectors: C-104, C-128 <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

C-104

C-128

C-104

C-128

AC310649

AB

Connector: E-03 <LHD>             

Harness side

AC310653

AB

Connector: E-03 <RHD>             

Harness side