MITSUBISHI LANCER 2005 Workshop Manual

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-47
Prior to the wiring harness inspection, check
intermediate connector C-121 and C-138 and
junction block connector C-211, and repair if
necessary.
•Check the rear window defogger relay 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 9. Voltage measurement at C-213 rear
window defogger relay connector.
(1) Remove the relay, and measure at the junction
block side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 11.
NO : . Go to Step 10.
STEP 10. Check the wiring harness between
C-213 rear window defogger relay connector
terminal No.3 and ignition switch (IG2).
AC303808
Junction block side Junction block (front view)
Connector: C-213
AK

AC303822
Junction block side Junction block (front view)
Connector: C-213
AL

AC301541EO
Connector C-213
(Junction block side)
3
4
5
12
AC303809
Connectors: C-210, C-213
AK
C-213
C-210
Junction block (front view)
C-210 Harness side
Junction block side
C-213
AC303823
Junction block side Junction block (front view)
Connectors: C-210, C-213
C-210C-213 Harness side
C-213
C-210
AI

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-48
NOTE: Prior to the wiring harness inspection, check
junction block connector C-210, and repair if
necessary.
•Check the rear window defogger relay 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 11. Check the wiring harness between
C-213 rear window defogger relay connector
terminal No.4 and F-22 rear window defogger
connector terminal No.1.
AC303809
Connectors: C-213, C-215
AR
C-213
Junction block (front view)
C-215
C-215 Harness side
7
155 614 132
9 124310 111
8
Junction block side
C-213
AC303823
Connectors: C-213, C-216
AS
C-213
Junction block (front view)
C-216
C-216 Harness side
7
155 614 132
9 124310 111
8
Junction block side
C-213
AC303954
Connectors: F-02, F-22

AJ
F-22
F-02
F-02 Harness side
F-22
AC303943
Connector: F-22

Harness side
AD

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-49
NOTE: Prior to the wiring harness inspection, check
intermediate connector F-02 and
junction block connector C-215 or C-216
, 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

AC303945
Harness side
AE
Connector: F-22
AC303802
Connector: C-139

AE
C-139 (B)
Harness side
AC303818
Connector: C-139

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
or C-139 A/C-ECU connector or heater
control unit connector terminal No.9 .
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

AE
C-139 (B)
Harness side
AC303818
Connector: C-139

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

C-212
Harness side
Junction block side
C-213
AC303823
Connectors: C-212, C-213
AN
Junction block (front view)
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

AH
Harness side
AC303943
Connector: F-06
Harness side
AE

AC303956
Harness side
AG
Connector: F-06

AC303945
Harness side
AF
Connector: F-06

AC303943
Connector: F-06
Harness side
AE

AC303945
Harness side
AF
Connector: F-06

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

AC303945
Harness side
AF
Connector: F-06

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 VENTILATION55-54
DIAGNOSIS
STEP 1. Connector check: C-139 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO : Repair the connector.
STEP 2. Voltage measurement the voltage at
C-139 A/C-ECU connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 10 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4.
NO : Go to Step 3.
STEP 3. Check the wiring harness between C-139
A/C-ECU connector terminal No.10 and the
ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check junction
block connectors C-210 and C-212, and repair if
necessary.
•Check the A/C-ECU 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.
AC303802
Connector: C-139

AE
C-139 (B)
Harness side
AC303802
Connector: C-139

AE
C-139 (B)
Harness side
AC301541EQ
Connector C-139
(Harness side)
9
1
1574
12
1110
23
13
5
14616
8
AC303802
Connector: C-139

AE
C-139 (B)
Harness side
AC303809
Junction block (front view)
Connectors: C-210, C-212
C-210
Harness side
C-212
C-210
AJ

C-212
Harness side

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-55
STEP 4. Resistance measurement resistance at
C-139 A/C-ECU connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between terminal 12 and
body earth.
OK: 2 ohms or less
Q: Is the check result normal?
YES :
Replace the manual air conditioner control
panel (A/C-ECU).
NO : Go to Step 5.
STEP 5. Check the wiring harness between C-139
A/C-ECU connector terminal No.12 and the earth.
NOTE:
Prior to the wiring harness inspection, check joint
connector C-104, and repair if necessary.
•Check the A/C-ECU earth line for open circuit.
Q: Is the check result normal?
YES :
Replace the manual air conditioner control
panel (A/C-ECU).
NO : Repair the wiring harness.
AC303802
Connector: C-139

AE
C-139 (B)
Harness side
AC301541ER
Connector C-139
(Harness side)
91
1574
12111023135146168
AC303802
Connector: C-139

AE
C-139 (B)
Harness side
AC303804
Connector: C-104

AJ
C-104 (GR)

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