Mitsubishi Lancer Evolution IX. Manual — part 547

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-61

Prior to the wiring harness inspection, check interme-
diate connector C-10, joint connector C-101 and
junction block connectors C-210 and C-211, and
repair if necessary.

• Check the motor power supply line for open cir-

cuit.

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 5. Check the outside/inside air selection
damper control motor
Refer to

P.55-114

.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Replace the outside/inside air selection
damper control motor.

STEP 6. Connector check: C-37 A/C-ECU
connector and C-07 outside/inside air selection
damper control motor connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the connector.

AC504635AF

Harness side

C-210

Junction block (Front view)

C-211

C-211

C-210

Connectors: C-210, C-211 <RHD>

AC504617AK

Connector: C-07 <LHD>

Harness side

AC504624AG

Connectors: C-07, C-37 <RHD>

Harness side

C-07

C-07

C-37

C-37 (B)

AC504622AC

Connector: C-37 <LHD>

Harness side

C-37 (B)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-62

STEP 7. Check the wiring harness between C-37
A/C-ECU connector (terminals 23 and 26) and
C-07 outside/inside air selection damper control
motor connector (terminals 6 and 4).

NOTE: Prior to the wiring harness inspection, check
intermediate connector C-10, and repair if necessary.

• Check the motor activating lines 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.

AC504701AB

Connectors: C-07, C-10 <LHD>

Harness side

C-07

C-10

C-07

C-10

AC504624AH

Connectors: C-07, C-10, C-37 <RHD>

Harness side

C-07

C-07

C-37

C-10

C-37 (B)

C-10

Harness side

AC504622AC

Connector: C-37 <LHD>

Harness side

C-37 (B)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-63

Inspection Procedure 8: Rear Window Defogger function does not operate.

CIRCUIT OPERATION

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 defec-
tive.

PROBABLE CAUSES

• Malfunction of the A/C-ECU

• Malfunction of the rear window defogger relay

• Damaged the wiring harness or connectors

• Malfunction of the rear window defogger

DIAGNOSIS PROCEDURE

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.55-73

."

Rear Window Defogger 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

REAR WINDOW
DEFOGGER
RELAY

REAR WINDOW
DEFOGGER

A/C-ECU

FUSIBLE
LINK

1

IGNITION
SWITCH (IG2)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-64

STEP 2. Voltage measurement at F-16 rear
window defogger connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Turn the rear window defogger switch to the "ON"

position.

(3) 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 3.

STEP 3. Check the rear window defogger relay
continuity.
Refer to

P.55-107

.

Q: Is the rear window defogger relay in good

condition?
YES :

Go to Step 4.

NO :

Replace the rear window defogger relay.

STEP 4. Voltage measurement at C-215 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 7.

NO :

Go to Step 5.

AC504707AB

Harness side

Connector: F-16 <LHD>

AC504709AB

Harness side

Connector: F-16 <RHD>

AC301541KE

Connector F-16
(Harness side)

AC504692AC

Connector: C-215 <LHD>

Junction block side

Junction block (Front view)

AC504694AC

Junction block (Front view)

Junction block side

Connector: C-215 <RHD>

AC301541KF

Connector C-215
(Junction block side)