Mitsubishi Grandis. Manual — part 313
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-137
Step 8. Check the wiring harness between D-11
rear power transistor connector (terminal 1 and
3) and C-104 A/C-ECU connector (terminal 60 and
59).
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-15, and repair if necessary.
• Check the rear window defogger relay line for
open or short circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness.
Step 9. Replace the rear power transistor and
recheck the trouble symptom
Check that the rear blower motor should work
normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
STEP 10. 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.
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
AC310207
AC
Harness side
Connector: D-11
AC310615
AD
Connector: C-15 <LHD>
AC310628AE
Connector: C-15 <RHD>
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-138
INSPECTION PROCEDURE 17: The temperature of rear air conditioner cannot be controlled <vehicles
with dual automatic A/C>
COMMENTS ON TROUBLE SYMPTOM
If the temperature of rear air conditioner con not be
controlled, the rear heater controller circuit system or
the rear air mix damper control motor circuit system
may be defective.
POSSIBLE CAUSES
• Malfunction of rear air mix damper control motor
• Malfunction of rear heater controller
• Malfunction of the A/C-ECU
• Damaged harness wires and connectors
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
.
Step 2. MUT-III actuator test
Carry out the actuator test. (Refer to
• Item 13: R.Air mix dumper motor: 0%
• Item 14: R.Air mix dumper motor: 50%
• Item 15: R.Air mix dumper motor: 100%
Q: Does the rear blower motor work normally?
YES :
Go to Step 3.
NO :
Go to Step 8.
Step 3. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 12: R.Air mix potentiometer
• Item 13: R.Air mix potentiometer (Target)
• Item 51: Rear Temperature setting
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 4.
REAR HEATER
CONTROLLER
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
A/C-ECU
Rear heater Controller Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-139
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.
Step 6. Connector check: C-106 A/C-ECU
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the connector.
AC310649
AB
Connector: E-03 <LHD>
Harness side
AC310653
AB
Connector: E-03 <RHD>
Harness side
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310631AB
Connectors: C-106 <RHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-140
Step 7. Check the wiring harness between E-03
rear heater controller connector (terminals 14,
15, and 16) and C-106 A/C-ECU connector
(terminals 15, 14 and 1).
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