fog MITSUBISHI LANCER 2005 Owner's Guide

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-49
NOTE: Prior to the wiring harness inspection, check
intermediate connector F-02 <WAGON-L.H.D> and
junction block connector C-215 <L.H.D.> or C-216
<R.H.D.>, and repair if necessary.
•Check the rear window defogger relay output line
for open circuit.
Q: Is the check result normal?
YES :
Go to Step 12.
NO : Repair the wiring harness.
STEP 12. Connector check: C-139 A/C-ECU
connector or heater control unit connector
Q: Is the check result normal?
YES :
Go to Step 13.
NO : Repair the connector.
AC303956
Connector: F-22
Harness side
AH
<WAGON - R.H.D.>
AC303945
Harness side
AE
Connector: F-22
<SEDAN - R.H.D.>AC303802
Connector: C-139
<L.H.D.>
AE
C-139 (B)
Harness side
AC303818
Connector: C-139
<R.H.D.>
AJ
Harness side
C-139 (B)
11 12657 8 9 103 421

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-50
STEP 13. Check the wiring harness between
C-213 rear window defogger relay connector
terminal No.1 and C-139 A/C-ECU connector or
heater control unit connector terminal No.1
<L.H.D.> or C-139 A/C-ECU connector or heater
control unit connector terminal No.9 <R.H.D.>.
NOTE: Prior to the wiring harness inspection, check
junction block connector C-212, and repair if
necessary.
•Check the rear window defogger relay earth line
for open or short circuit.
Q: Is the check result normal?
YES :
Replace the manual air conditioner control
panel (A/C-ECU) or the heater control unit.
NO : Repair the wiring harness.
AC303802
Connector: C-139
<L.H.D.>
AE
C-139 (B)
Harness side
AC303818
Connector: C-139
<R.H.D.>
AJ
Harness side
C-139 (B)
11 12657 8 9 103 421
AC303809
Junction block (front view)
Connectors: C-212, C-213
C-212C-213
AO
<L.H.D.>
C-212
Harness side
Junction block side
C-213
AC303823
Connectors: C-212, C-213
AN
Junction block (front view) <R.H.D.>
C-213C-212Junction block side
C-213
C-212
Harness side

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-51
STEP 14. Connector check: F-06 rear window
defogger connectorQ: Is the check result normal?
YES :
Go to Step 15.
NO : Repair the connector.
STEP 15. Resistance measurement at F-06 rear
window defogger connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance value between terminal 1
and earth.
OK: 2 ohms or less
Q: Is the check result normal?
YES :
Go to Step 17.
NO : Go to Step 16.
AC303954
Connector: F-06
<WAGON - L.H.D.>
AH
Harness side
AC303943
Connector: F-06
Harness side
AE
<SEDAN - L.H.D.>
AC303956
Harness side
AG
Connector: F-06
<WAGON - R.H.D.>
AC303945
Harness side
AF
Connector: F-06
<SEDAN - R.H.D.>
AC303943
Connector: F-06
Harness side
AE
<SEDAN - L.H.D.>
AC303945
Harness side
AF
Connector: F-06
<SEDAN - R.H.D.>
AC301541EP
Connector F-06
(Harness side)
1

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-52
STEP 16. Check the wiring harness between F-06
rear window defogger connector terminal No.1
and earth.
•Check the rear window defogger 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 P.00-5).
NO : Repair the wiring harness.
STEP 17. Check the rear window defogger.
Refer to GROUP 54A, Rear window defogger
P.54A-96.
Q: Does the rear window defogger work normally?
YES :
Replace the manual air conditioner control
panel (A/C-ECU) or the heater control unit.
NO : Repair the rear window defogger.
INSPECTION PROCEDURE 8: Rear Window Defogger Timer Function does not Operate.
COMMENTS ON TROUBLE SYMPTOM
Turn ON the rear window defogger switch. If the rear
window defogger does not shut off after roughly 11
minutes then the rear window defogger timer is
malfunctioning.
TROUBLESHOOTING HINTS
•Malfunction of the manual air conditioner control
panel (A/C-ECU) or the heater control unit
DIAGNOSIS
Check the performance of the rear window
defogger timer operations.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the rear window defogger switch to the "ON"
position (operate for approx. 11 minutes)
Q: Does the rear window defogger timer function
work normally?
YES :
Intermittent malfunction
NO : Replace the manual air conditioner control
panel (A/C-ECU) or the heater control unit.
AC303943
Connector: F-06
Harness side
AE
<SEDAN - L.H.D.>
AC303945
Harness side
AF
Connector: F-06
<SEDAN - R.H.D.>

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-53
INSPECTION PROCEDURE 9: Malfunction of the A/C-ECU Power Supply System. <L.H.D.>
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. <R.H.D.>
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 <L.H.D.>M1552010300527
12
345
678
9 10111213141516
AC300861AC
<C-139>
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 <R.H.D.>M1552010300538
21
78
6 534
11
10912
AC304990
AB
<C-139>
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

HEATER CONTROL ASSEMBLY AND A/C SWITCH
HEATER, AIR CONDITIONER AND VENTILATION55-79
INSPECTIONM1552014300927
BLOWER SWITCH CONTINUITY CHECK
DISASSEMBLY AND REASSEMBLY
M1552014200180
12
6 3
45
AC100615AB
Switch
positionTester connection Specified
condition
0 (OFF) 1 − 2, 2 − 4, 2 − 5, 2 − 6 Open circuit
1 (LO) 1 − 2 Less than 2
ohms
2 (ML) 2 − 4 Less than 2
ohms
3 (MH) 2 − 5 Less than 2
ohms
4 (HI) 2 − 6 Less than 2
ohms
AC100614
1 23
4
5 67 8
AB
Disassembly steps
1. Switch panel
2. Rear window defogger switch
3. Air conditioner switch
4. Inside/outside air selection switch
<<A>>5. Mode selection damper control
cable
<<A>>6. Air mixing damper control cable7. Blower switch assembly
8. Manual air conditioner control panel
(A/C-ECU) Disassembly steps (Continued)

RELAY
COMPONENT LOCATIONS70-5
RELAY
M1701000400369
Name Symbol Name Symbol
A/C compressor relay A Heated seat relay B
A/T control relay A Horn relay A
Accessory socket relay B Ignition coil relay A
Blower relay B Power window relay B
Engine control relay A Radiator fan relay A
Front fog lamp relay A Rear fog lamp relay B
Fuel pump relay (1) B Rear window defogger relay B
Fuel pump relay (2) B
AC301758AB
A
B
AC303951AB
A/C compressor relayEngine control relay
Horn relay
Front fog lamp relay
Radiator fan relay A/T control relay
Ignition coil relayA
AC301760
Fuel pump relay (1)
Power window relay
Rear window defogger relay
Blower relay Heated seat relay
Fuel pump relay(2)
Accessory socket relay
Rear fog lamp relayAB
B