Mitsubishi Lancer Evolution IX. Manual - part 541

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-37

NOTE: 

Prior to the wiring harness inspection, check interme-
diate connector C-10, and repair if necessary.

• Check the air thermo sensor output and earth line 

for open or short circuit.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the wiring harness.

STEP 12. Check the wiring harness between A-25 
dual pressure switch connector terminal No.1 
and C-37 A/C-ECU connector terminal No.34.

AC504617AF

Connector: C-10 <LHD>

AC504618AF

Connector: C-10 <RHD>

AC504616AC

Connector: A-25

Harness side

A-25 (BR)

AC504622AC

Connector: C-37 <LHD>

Harness side

C-37 (B)

AC504618AE

Connector: C-37 <RHD>

Harness side

C-37 (B)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-38

NOTE: 

Prior to the wiring harness inspection, check interme-
diate connector C-111, and repair if necessary.

• Check the dual pressure switch output line for 

open or short circuit.

Q: Is the check result normal?

YES : 

Go to Step 13.

NO : 

Repair the wiring harness.

STEP 13. Connector check: C-117 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 14.

NO : 

Repair the connector.

AC504617AE

Connector: C-111 <LHD>

AC504625AB

Connector: C-111 <RHD>

AC504617AG

Connector: C-117 <LHD>

Harness side

C-117 (GR)

AC504618AY

Connector: C-117

Harness side

C-117 (GR)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-39

STEP 14. Check the wiring harness between 
C-117 engine-ECU connector terminal No.83 and 
A-25 dual pressure switch connector terminal 
No.2.

NOTE: 

Prior to the wiring harness inspection, check interme-
diate connector C-111 and C-124 <LH drive vehi-
cles> or C-122 <RH drive vehicles>, and repair if 
necessary.

• Check the communication line for open or short 

circuit.

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair the wiring harness.

AC504616AC

Connector: A-25

Harness side

A-25 (BR)

AC504701AE

Connector: C-111, C-117 <LHD>

Harness side

C-117 (GR)

C-117

C-111

C-111

AC504624AS

Connector: C-117, C-122 <RHD>

Harness side

C-117

C-122

C-122

C-117 (GR)

AC504625AB

Connector: C-111 <RHD>

AC504622AD

Connector: C-124 <LHD>

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-40

STEP 15. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 16.

NO : 

Repair the connector.

STEP 16. Check the wiring harness between 
C-119 engine-ECU connectors terminal No.65 
and C-37 A/C-ECU connector terminal No.32.

AC504617AH

Connector: C-119 <LHD>

Harness side

C-119 (GR)

AC504618AI

Connector: C-119 <RHD>

Harness side

C-119 (GR)

AC504622AC

Connector: C-37 <LHD>

Harness side

C-37 (B)

AC504618AE

Connector: C-37 <RHD>

Harness side

C-37 (B)

AC504617AH

Connector: C-119 <LHD>

Harness side

C-119 (GR)

AC504618AI

Connector: C-119 <RHD>

Harness side

C-119 (GR)