front MITSUBISHI LANCER 2005 Workshop Manual

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-37
STEP 18. Check the wiring harness between
C-140 blower switch connector terminal No.2 and
C-214 blower relay connector terminal No.4.
NOTE: Prior to the wiring harness inspection, check
junction block connectors C-210, and repair if
necessary.
•Check the blower relay output line for open
circuit.
Q: Is the check result normal?
YES :
Go to Step 19.
NO : Repair the wiring harness.
AC303802
Connector: C-140

AF
Harness side
AC303818
Connector: C-140

AK
Harness side
AC303809
Connectors: C-210, C-214
AL
C-214
C-210
Junction block (front view)
C-210 Harness side
Junction block side
C-214
AC303823
Junction block side Junction block (front view)
Connectors: C-210, C-214
C-210C-214 Harness side
C-214
C-210
AK

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 VENTILATION55-50
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 VENTILATION55-54
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 VENTILATION55-57
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 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 7 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.7 and the
ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check junction
block connectors C-210, C-212 and joint connector
C-35, and repair if necessary.
•Check the A/C-ECU power supply line for open
circuit.
AC303818
Connector: C-139

AJ
Harness side
C-139 (B)
11 12657 8 9 103 421
AC303818
Connector: C-139

AJ
Harness side
C-139 (B)
11 12657 8 9 103 421
AC301541ES
Connector C-139
(Harness side)
11 12
65
7 8 9 10
3 421
AC303818
Connector: C-139

AJ
Harness side
C-139 (B)
11 12657 8 9 103 421
AC303814
Connector: C-35

AS
C-35(L)
AC303823
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 VENTILATION55-60
COMMENTS ON TROUBLE SYMPTOM
If the power is not supplied to the A/C compressor,
the A/C compressor circuit system may be
defective..
TROUBLESHOOTING HINTS
•Malfunction of the A/C compressor relay
•Damaged the wiring harness or connectors
DIAGNOSIS
STEP 1. Connector check: B-17X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO : Repair the connector.
STEP 2. Check the A/C compressor relay
continuity.
Refer to P.55-75.
Q: Is the A/C compressor relay in good condition?
YES :
Go to Step 3.
NO : Replace the A/C compressor relay.
STEP 3. Voltage measurement at B-17X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay box
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO : Go to Step 4.
NO : Go to Step 5.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC301541EU
Connector B-17X
(Relay box side)
Front of
vehicle1
3 2
4

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-61
STEP 4. Check the wiring harness between B-17X
A/C compressor relay connector terminal No.2
and the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector C-15, joint connector C-35,
junction block connectors C-209 and C-210, and
repair if necessary.
•Check the A/C compressor 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.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303800
Connector: C-15

AE
C-15 (L)
AC303798
Connector: C-35

AJ
2 1313 12 1421 105 4616 15 17789
19 18 2011
22
C-35 (L)
AC303809
Connectors: C-209, C-210
AF
C-209
C-210
Junction block (front view)
C-209
Harness side
1016
145
12134117 238 9
C-210
Harness side
4 65321