Mitsubishi Lancer Evolution IX. Manual — part 550
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-73
Inspection Procedure 9: Malfunction of the A/C-ECU power supply system.
CIRCUIT OPERATION
The A/C-ECU power system may be defective if the
A/C, defogger, and outside/inside air selection
damper motor all do not operate normally.
PROBABLE CAUSES
• Damaged the wiring harness or connectors
• Malfunction of the A/C-ECU
A/C-ECU Power Supply Circuit
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
IGNITION
SWITCH (IG2)
BATTERY
BACK-UP
A/C-ECU
BATTERY
RELAY
BOX
<LHD>
<RHD>
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-74
DIAGNOSIS PROCEDURE
STEP 1. Voltage measurement at A/C-ECU
connector C-37.
(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 28 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 2.
STEP 2. Connector check: C-37 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
STEP 3. Check the wiring harness between C-37
A/C-ECU connector terminal No.28 and the
ignition switch (IG2).
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504618AE
Connector: C-37 <RHD>
Harness side
C-37 (B)
AC301541JV
Connector C-37
(Harness side)
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504618AE
Connector: C-37 <RHD>
Harness side
C-37 (B)
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504618AE
Connector: C-37 <RHD>
Harness side
C-37 (B)
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-75
NOTE:
Prior to the wiring harness inspection, check junction
block connectors C-214 and C-211, and repair if nec-
essary.
• Check the A/C-ECU power supply line for open or
short 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 4. Resistance measurement at C-37
A/C-ECU connector.
(1) Remove the relay, and measure at the junction
block side.
(2) Continuity between terminal 27 and body earth.
OK: 2 ohm or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 5.
AC504633AB
Connectors: C-211, C-214 <LHD>
Harness side
Junction block (Front view)
C-214
C-211
C-211
C-214
AC504635AB
Harness side
C-211
C-211
C-214
C-214
Junction block (Front view)
Connectors: C-211, C-214 <RHD>
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504618AE
Connector: C-37 <RHD>
Harness side
C-37 (B)
AC301541JW
Connector C-37
(Harness side)
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-76
STEP 5. Connector check: C-37 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the connector.
STEP 6. Check the wiring harness between C-37
A/C-ECU connector terminal No.27 and the earth.
NOTE:
Prior to the wiring harness inspection, check joint
connector C-06 <LH drive vehicles>, and repair if
necessary.
• Check the A/C-ECU earth line for open or short
circuit.
Q: Is the check result normal?
YES :
Replace the automatic A/C control panel
(A/C-ECU).
NO :
Repair the wiring harness.
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504618AE
Connector: C-37 <RHD>
Harness side
C-37 (B)
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504618AE
Connector: C-37 <RHD>
Harness side
C-37 (B)
AC504617AI
Connector: C-06 <LHD>
C-06 (GR)
AC504625AC
Connector: C-06 <RHD>
C-06 (GR)
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