2005 MITSUBISHI LANCER Motor

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-38
STEP 19. Check the wiring harness between
C-110 blower motor connector terminal No.1 and
C-140 blower switch connector terminal No.6.
•Check the blower motor power supply 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 P.00-5).
NO : Repair the wiring harness.
STEP 20. Check the blower fan and motor
operation.
Refer to P.55-86.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-5).
NO : Replace the blower motor.AC303804
Connector: C-110

AF
Harness side
AC303816
Connector: C-110
AK

Harness side
AC303802
Connector: C-140

AF
Harness side
AC303818
Connector: C-140

AK
Harness side

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-39
INSPECTION PROCEDURE 6: Blower Air Amount cannot be Changed.
COMMENTS ON TROUBLE SYMPTOM
If the blower air amount can not be changed when
the blower switch is operated, the blower switch may
be defective.
TROUBLESHOOTING HINTS
•Malfunction of the resistor
•Damaged the wiring harness or connectors
•Malfunction of the blower switch
DIAGNOSIS
STEP 1. Check that the blower motor operates
when the blower switch is moved to the "4 (HI)"
position.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the blower switch to the "4 (HI) " position.
Q: Does the blower motor operate when the blower
switch is moved to the "4 (HI)" position?
YES :
Go to STEP 2.
NO : Refer to Inspection procedure 5 "Blower fan
and motor do not turn P.55-29."
BLOWER RELAY
BLOWER
SWITCH
RESISTOR
BLOWER
MOTOR
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 Blower Switch and Resistor Circuit

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-41
•Check the blower switch output line for open
circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO : Repair the wiring harness.
STEP 6. Connector check: C-110 blower motor
connector
Q: Is the check result normal?
YES :
Go to Step 7.
NO : Repair the connector.
STEP 7. Check the wiring harness between C-110
blower motor connector (terminal 1) and C-109
resistor connector (terminal 2).
•Check the blower motor power supply line for
open circuit.
Q: Is the check result normal?
YES :
No action to be taken.
NO : Repair the wiring harness.
AC303802
Connector: C-140

AF
Harness side
AC303818
Connector: C-140

AK
Harness side
AC303804
Connector: C-110

AF
Harness side
AC303816
Connector: C-110
AK

Harness side
AC303804AL
Connectors: C-109, C-110

C-109
C-110C-109
C-110
Harness side
AC303816
Connectors: C-109, C-110
AP

Harness side
C-109
C-110
C-110
C-109

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-43
COMMENTS ON TROUBLE SYMPTOM
If the rear window defogger does not operate when
the rear window defogger switch is turned on, the
rear window defogger relay system may be
defective.
TROUBLESHOOTING HINTS
•Malfunction of the rear window defogger relay
•Malfunction of the rear window defogger
•Damaged the wiring harness or connectors
•Malfunction of the manual air conditioner control
panel (A/C-ECU) or the heater control unit
DIAGNOSIS
STEP 1. Check the A/C and outside/inside air
selection damper control motor operation.
Q: Do the A/C and outside/inside air selection damper
control motor work normally?
YES :
Go to Step 2.
NO : Refer to Inspection procedure 9
"Malfunction of the A/C-ECU Power Supply
system P.55-53 ."
NO : Refer to Inspection procedure 10
"Malfunction of the A/C-ECU Power Supply
system P.55-56 ."
STEP 2. Connector check: F-22 rear window
defogger connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO : Repair the connector.
AC303954
Connector: F-22

AI
Harness side
AC303943
Connector: F-22

Harness side
AD
AC303956
Connector: F-22
Harness side
AH

AC303945
Harness side
AE
Connector: F-22

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-53
INSPECTION PROCEDURE 9: Malfunction of the A/C-ECU Power Supply System.
COMMENTS ON TROUBLE SYMPTOM
The A/C-ECU power system may be defective if the
air conditioner, defogger, and outside/inside air
selection damper motor all do not operate normally.
TROUBLESHOOTING HINTS
•Damaged the wiring harness or connectors
•Malfunction of the manual air conditioner control
panel (A/C-ECU)
IGNITION
SWITCH (IG2)
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 HEATER CONTROL PANEL
A/C-ECU Power Supply Circuit

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-56
INSPECTION PROCEDURE 10: Malfunction of the A/C-ECU Power Supply System.
COMMENTS ON TROUBLE SYMPTOM
The A/C-ECU power system may be defective if the
air conditioner, defogger, and outside/inside air
selection damper motor all do not operate normally.
TROUBLESHOOTING HINTS
•Damaged the wiring harness or connectors
•Malfunction of the manual air conditioner control
panel (A/C-ECU)
IGNITION
SWITCH (IG2)
HEATER CONTROL PANELA/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
A/C-ECU Power Supply Circuit

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-67
CHECK AT ECU TERMINAL M1552010300527
12
345
678
9 10111213141516
AC300861AC

Terminal No. Check item Checking requirement Normal condition
1 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
2 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
3 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
4 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
5 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
6 Power supply to the A/C
illuminationLighting switch: ON System voltage
7---
8 Blower switch (lo) blower switch: lo System voltage
9---
10 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
11 Earth to the A/C illumination Always 0 V
12 Earth Always 0 V
13 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
14, 15 - - -
16 Earth to the air thermo sensor Always 0 V

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-68
CHECK AT ECU TERMINAL M1552010300538
21
78
6 534
11
10912
AC304990
AB

Terminal No. Check item Checking requirement Normal condition
1 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
2 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
3 Earth Always 0 V
4 Earth to the air thermo sensor Always 0 V
5 Power supply to the A/C
illuminationLighting switch: ON System voltage
6 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
7 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
8 Blower switch (lo) blower switch: lo System voltage
9 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
10 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
11 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
12 Earth to the A/C illumination Always 0 V