air condition MITSUBISHI LANCER 2005 Owners Manual

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-42
INSPECTION PROCEDURE 7: Rear Window Defogger Function does not Operate.
IGNITION
SWITCH (IG2) FUSIBLE LINK
REAR WINDOW
DEFOGGER
RELAY
A/C-ECU OR
HEATER
CONTROL UNIT1
: SEDAN
: WAGON
: SEDAN
: WAGON
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






NOTE
REAR WINDOW
DEFOGGERREAR WINDOW
DEFOGGER Rear Window Defogger Circuit

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 VENTILATION55-44
STEP 3. Voltage measurement at F-22 rear
window defogger connector.
(1) Disconnect the connector, and measure at the
wiring harness side.(2) Turn the ignition switch to the "ON" position.
(3) Turn the rear window defogger switch to the "ON
" position.
(4) Measure the voltage between terminal 1 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 14.
NO : Go to Step 4.
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

AC400965AJ
Connector F-22
(Harness side)
1
SEDAN and WAGON
AC400965AI
Connector F-22
(Harness side)
SEDAN and WAGON

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-45
STEP 4. Connector check: C-213 rear window
defogger relay connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO : Repair the connector.
STEP 5. Check the rear window defogger relay
continuity.
Refer to P.54A-96.
Q: Is the rear window defogger relay continuity in
good condition?
YES :
Go to Step 6.
NO : Replace the rear window defogger relay.
STEP 6. Voltage measurement at C-213 rear
window defogger relay connector.
(1) Remove the relay, and measure at the junction
block side.
(2) Measure the voltage between terminal 5 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 9.
NO : Go to Step 7.
NO : Go to Step 8.
AC303808
Junction block side Junction block (front view)
Connector: C-213
AK

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

AC303808
Junction block side Junction block (front view)
Connector: C-213
AK

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

AC301541EN
Connector C-213
(Junction block side)
3
4
5
12

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-46
STEP 7. Check the wiring harness between C-213
rear window defogger relay connector terminal
No.5 and the fusible link (1).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector C-21 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 8. Check the wiring harness between C-213
rear window defogger relay connector terminal
No.5 and the fusible link (1).
NOTE:
AC303809
Connectors: C-211, C-213
AM
C-213
C-211
Junction block (front view)
C-211 Harness side
Junction block side
C-213
AC303798
Connector: C-21

AK
AC303823
Connectors: C-211, C-213
AM
C-213
C-211
Junction block (front view)
C-211 Harness side
Junction block side
C-213
AC303816
Connector: C-121
AB

AC303818
Connector: C-138

AI

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