Mitsubishi Lancer Evolution IX. Manual — part 552
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-81
STEP 4. Check the wiring harness between B-13X
A/C compressor relay connector terminal No.2
and the ignition switch (IG2).
NOTE:
AC504760AB
Connector: B-13X
Front of
vehicle
1
3
2
4
Relay box side
AC504641AF
Connector: C-101, C-124 <LHD>
Harness side
C-101
C-124
C-124
C-101 (L)
AC504625AF
Connector: C-101 <RHD>
C-101 (L)
AC504618AH
Connector: C-122 <RHD>
C-122 (L)
AC504633AF
Connectors: C-210, C-211 <LHD>
Harness side
Junction block (Front view)
C-210
C-211
C-211
C-210
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-82
Prior to the wiring harness inspection, check interme-
diate connector C-124 <LH drive vehicles>, C-122
<RH drive vehicles>, joint connector C-101, junction
block connectors C-210 and C-211, and repair if nec-
essary.
• 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
NO :
Repair the wiring harness.
STEP 5. Voltage measurement at B-13X A/C
compressor relay connector.
(1) Remove the relay, and measure at the junction
block side.
(2) Measure the voltage between terminal 1 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
AC504635AF
Harness side
C-210
Junction block (Front view)
C-211
C-211
C-210
Connectors: C-210, C-211 <RHD>
AC504760AB
Connector: B-13X
Front of
vehicle
1
3
2
4
Relay box side
AC301541KJ
Connector B-13X
(Relay box side)
Front of
vehicle
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-83
STEP 6. Check the wiring harness between B-13X
A/C compressor relay connector terminal No.1
and the battery.
NOTE:
Prior to the wiring harness inspection, check interme-
diate connector A-29 <LHD> or C-31 <RHD>, 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
NO :
Repair the wiring harness.
STEP 7. Connector check: A-36 A/C compressor
connector
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the connector.
AC504760AB
Connector: B-13X
Front of
vehicle
1
3
2
4
Relay box side
AC504656AC
Connector: A-29 <LHD>
A-29 (B)
AC504618AP
Connector: C-31 <RHD>
Harness side
AC504616AB
Connector: A-36
A-36 (B)
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-84
STEP 8. Check the wiring harness between B-13X
A/C compressor relay connector terminal No.4
and A-36 A/C compressor connector terminal
No.1.
NOTE:
Prior to the wiring harness inspection, check interme-
diate connector A-13 <LHD> or C-31 <RHD>, and
repair if necessary.
• Check the A/C compressor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness.
STEP 9. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the connector.
AC504616AB
Connector: A-36
A-36 (B)
Harness side
AC504760AB
Connector: B-13X
Front of
vehicle
1
3
2
4
Relay box side
AC504656AD
Connector: A-13 <LHD>
A-13 (B)
AC504618AP
Connector: C-31 <RHD>
Harness side
AC504617AB
Connector: C-121 <LHD>
C-121 (GR)
Harness side
AC504618AB
Connector: C-121 <RHD>
Harness side
C-121 (GR)
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