Mitsubishi Grandis. Manual — part 309
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-121
COMMENTS ON TROUBLE SYMPTOM
If the rear blower motor does not operate, the rear
blower motor circuit system may be defective.
POSSIBLE CAUSES
• Malfunction of rear blower relay
• Malfunction of rear blower motor
• Malfunction of rear power transistor
• Malfunction of the A/C-ECU
• Damaged harness wires and connectors
DIAGNOSIS
Step 1. MUT-III diagnosis code
Check whether the air conditioner sets a diagnosis
code or not.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to diagnosis code chart
.
REAR
HEATER
CONTROLLER
A/C-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
Rear Heater Controller Circuit <R.H.D>
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-122
Step 2. MUT-III actuator test
Carry out the actuator test. (Refer to
.)
• 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
• 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
NO <Item 31 is abnormal> :
Refer to Inspection
Procedure 20: rear fan switch system
<LHD>
or Inspection Procedure
21: rear fan switch system <RHD>
.
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
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
55-123
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
55-124
Step 7. Check the wiring harness between E-03
rear heater controller connector (terminals 4, 6,
7, 8 and 9) and C-104 A/C-ECU connector
(terminals 70, 68, 67, 66 and 65).
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