Mitsubishi Lancer Evolution IX. Manual - part 534

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-9

STEP 2. Connector check: A-44 outside thermo 
sensor connector and C-36 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 A-44 
outside thermo sensor connector (terminals 1 
and 2) and C-36 A/C-ECU connector (terminals 20 
and 7).

AC504656AB

Connector: A-44

Harness side

A-44 (BR)

AC504622AB

Connector: C-36 <LHD>

Harness side

C-36 (B)

AC504618AJ

Connector: C-36 <RHD>

Harness side

C-36 (B)

AC504656AB

Connector: A-44

Harness side

A-44 (BR)

AC504622AB

Connector: C-36 <LHD>

Harness side

C-36 (B)

AC504618AJ

Connector: C-36 <RHD>

Harness side

C-36 (B)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-10

NOTE: 

Prior to the wiring harness inspection, check interme-
diate connector C-145 <LH drive vehicles> or C-129 
<RH drive vehicles>, and repair if necessary.

• Check the sensor signal line and 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.

AC504618AK

Connector: C-129 <RHD>

AC504622AE

Connector: C-145 <LHD>

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-11

Code No.15, 16: Heater Water Temperature Sensor System

COMMENTS ON TROUBLE SYMPTOM

This code is set when the heater water temperature 
sensor circuit is open (Code No.15) or is short (Code 
No.16).

PROBABLE CAUSES

• Malfunction of the heater water temperature sen-

sor

• Damaged the wiring harness or connectors

• Malfunction of the automatic A/C control panel 

(A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. Check the heater water temperature 
sensor.
Refer to 

P.55-117

.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the heater water temperature 
sensor.

Heater Water Temperature Sensor 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

HEATER WATER
TEMPERATURE
SENSOR

A/C-ECU

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-12

STEP 2. Connector check: C-36 A/C-ECU 
connector and C-32 heater water temperature 
connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the connector.

STEP 3. Check the wiring harness between C-36 
A/C-ECU connector (terminals 4 and 20) and C-32 
heater water temperature sensor connector 
(terminals 2 and 1).

AC504617AJ

Connector: C-32 <LHD>

Harness side

AC504624AE

Connector: C-32, C-36 <RHD>

Harness side

C-32

C-36

C-32

C-36 (B)

AC504622AB

Connector: C-36 <LHD>

Harness side

C-36 (B)

AC504617AJ

Connector: C-32 <LHD>

Harness side

AC504624AE

Connector: C-32, C-36 <RHD>

Harness side

C-32

C-36

C-32

C-36 (B)

AC504622AB

Connector: C-36 <LHD>

Harness side

C-36 (B)