Mitsubishi Grandis. Manual — part 312
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-133
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
55-134
INSPECTION PROCEDURE 16: Air volume of rear blower cannot be changed
COMMENTS ON TROUBLE SYMPTOM
If the blower air volume can not be changed when
the blower switch is operated, the wiring harness
between A/C-ECU and rear heater controller, and
rear power transistor circuit system may be
defective.
POSSIBLE CAUSES
• Malfunction of rear power transistor
• 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 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 blower motor work normally?
YES :
Go to Step 3.
NO :
Go to Step 4.
REAR
BLOWER
RELAY
REAR POWER
TRANSISTOR
REAR BLOWER
MOTOR
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 Blower Motor Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-135
Step 3. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 22: Rear blower motor
• Item 23: Rear blower motor (target value)
• Item 32: Rear control OFF SW
• Item 33: Rear control FAN SW
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Refer to Inspection Procedure 14: Rear
blower does not work <Vehicle with rear
heater or rear cooler>
Inspection Procedure 15: Rear blower does
not work <Vehicle with rear heater or rear
cooler>
Step 4. Connector check: D-11 rear power
transistor connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Resistance measurement at D-11 rear
power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 2 and body earth.
OK: 2 ohm or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
Step 6. Check the wiring harness between D-11
rear power transistor connector terminal No.2
and earth.
• Check the rear window defogger earth line for
open or short circuit.
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 :
Repair or replace the wiring harness.
AC310207
AC
Harness side
Connector: D-11
AC310207
AC
Harness side
Connector: D-11
AC310506
Connector D-11
(Harness side)
AT
AC310207
AC
Harness side
Connector: D-11
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-136
Step 7. Connector check: C-104 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the connector.
AC310613
AK
Connector: C-104 <LHD>
Harness side
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AC310631AH
Connector: C-104 <RHD>
Harness side
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