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)