Mitsubishi Grandis. Manual — part 310
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-125
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
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
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-126
Step 9. Connector check: C-215 rear blower
motor connector
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the connector.
STEP 10. Check the rear blower relay
Refer to
Q: Is the check result normal?
YES :
Refer to Inspection Procedure 22: Rear
blower motor power supply system
<LHD>
or Inspection Procedure
23: Rear blower motor power supply system
<RHD>
NO :
Replace the rear blower relay.
AC310623
Connector: C-215 <LHD>
AH
Junction block side
Junction block (Front view)
AC310618
Connector: C-215 <RHD>
AH
Junction block side
Junction block (Front view)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-127
INSPECTION PROCEDURE 15: Rear blower does not work <vehicles with dual automatic A/C>
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 <L.H.D>
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-128
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>
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