Mitsubishi Grandis. Manual — part 318
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-157
Step 11. Connector check: D-10 rear blower
motor
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the connector.
Step 12. Check the rear blower motor
Refer to
.
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Replace the rear blower motor.
Step 13. Check the wiring harness between D-10
rear blower motor connector terminal No.1 and
C-15 intermediate connector terminal No.1.
• Check the rear blower relay power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 14.
NO :
Repair the wiring harness.
Step 14. Connector check: D-11 rear power
transistor connector
Q: Is the check result normal?
YES :
Go to Step 15.
NO :
Repair the connector.
Step 15. Resistance measurement at the 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
Ω or less
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Go to Step 16.
AC310207
AD
Harness side
Connector: D-10
AC310615
AD
Connector: C-15 <LHD>
AC310207
AD
Harness side
Connector: D-10
AC310207
AC
Harness side
Connector: D-11
AC310207
AC
Harness side
Connector: D-11
AC310506
Connector D-11
(Harness side)
AT
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-158
Step 16. Check the wiring harness between D-11
rear power transistor terminal No.2 and body
earth.
• Check the blower linear controller earth line for
open 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 the wiring harness.
Step 17. Connector check: C-104 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Repair the connector.
Step 18. Check the wiring harness between D-11
rear power transistor connector terminal No.4
and D-10 rear blower motor connector terminal
No.2.
• Check the blower linear controller earth line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Repair the wiring harness.
AC310207
AC
Harness side
Connector: D-11
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
AC310208
AB
Harness side
Connectors: D-10, D-11
D-10
D-11
D-10
Harness side
D-11
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-159
Step 19. Check the wiring harness between D-11
rear power transistor connector (terminal 1 and
3) and D-10 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 blower linear controller earth line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 20.
NO :
Repair the wiring harness.
Step 20. 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.
AC310208
AB
Harness side
Connectors: D-10, D-11
D-10
D-11
D-10
Harness side
D-11
AC310615
AD
Connector: C-15 <LHD>
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-160
INSPECTION PROCEDURE 23: Rear blower motor power supply system <RHD>
CIRCUIT OPERATION
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
FUSIBLE
LINK
30
IGNITION
SWITCH (IG2)
FUSE BOX
REAR
BLOWER
RELAY
REAR
BLOWER
MOTOR
REAR
POWER
TRANSISTOR
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
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