Mitsubishi Grandis. Manual — part 285
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-25
Step 3. Check the wiring harness between C-106
A/C-ECU connector (terminals 14, 22 and 1) and
G-13-1 rear air mixing damper control motor and
potentiometer connector (terminals 4, 3 and 5).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector G-13, C-15 and joint
connector C-01, and repair if necessary.
• Check the potentiometer power supply, earth and
signal line for open or short circuit.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
Step 4. Check the rear air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the rear air mixing damper control
motor and potentiometer.
Step 5. MUT-III diagnosis code
Q: Is the diagnosis code set?
YES :
Replace the automatic air conditioner
control panel (A/C-ECU)
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
AC310614
AG
Connectors: C-01, C-106 <LHD>
C-01
C-106
C-01
C-106
Harness side
AC311185
Connectors: G-13, G-13-1
AB
G-13-1
G-13
G-13-1
G-13
Harness side
AC310615
AD
Connector: C-15 <LHD>
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-26
Code No. B1051,B1052: Potentiometer system for rear air mix damper <vehicles with RHD dual
automatic A/C>
COMMENTS ON TROUBLE SYMPTOM
This code is set when the rear air mixing damper
control motor potentiometer does not send any
signal to the A/C-ECU due to short or open circuit.
POSSIBLE CAUSES
• Malfunction of the rear air mixing damper control
motor and potentiometer
• Damaged the wiring harness or connectors
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
DIAGNOSIS
Step 1. 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)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 2.
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 AIR MIXING
DAMPER CONTROL
MOTOR AND
POTENTIOMETER
A/C-ECU
Rear Air Mixing Damper Control Motor And Potentiometer Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-27
Step 2. Connector check: C-106 A/C-ECU
connector and G-13-1 rear air mixing damper
control motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC311184
Connector: G-13-1
AB
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-28
Step 3. Check the wiring harness between C-106
A/C-ECU connector (terminals 14, 22 and 1) and
G-13-1 rear air mixing damper control motor and
potentiometer connector (terminals 4, 3 and 5).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector G-13 and C-15, and repair if
necessary.
• Check the potentiometer power supply, earth and
signal line for open or short circuit.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
Step 4. Check the rear air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the rear air mixing damper control
motor and potentiometer.
Step 5. MUT-III diagnosis code
Q: Is the diagnosis code set?
YES :
Replace the automatic air conditioner
control panel (A/C-ECU)
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC311185
Connectors: G-13, G-13-1
AB
G-13-1
G-13
G-13-1
G-13
Harness side
AC310628AE
Connector: C-15 <RHD>
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