Mitsubishi Lancer (4A9 engine). Manual — part 284

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-17

Code No. B1018: Temperature control dial SW error <Vehicles without A/C>

Heater Control Panel Circuit

HEATER
CONTROL
UNIT

HEATER
CONTROL
PANEL

CPU

INTERFACE
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 SI : Silver

ACA00851

AC612706

Connectors: C-60, C-147 <LHD>

BP

C-60 (B)

C-147

COMMENTS ON TROUBLE SYMPTOM
This code will be set when the temperature control
dial position on the AC control panel is detected as
abnormal.

PROBABLE CAUSES

• Malfunction of the heater control panel

• Damaged wiring harness or connectors

• Malfunction of the heater control unit

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-147 heater control
panel connector and C-60 heater control unit
connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector.

STEP 2. Check the wiring harness between C-147
heater control panel connector terminal No. 9
and C-60 heater control unit connector terminal
No. 9.

• Check the heater control panel signal line for

open or short circuit.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the wiring harness.

STEP 3. Check whether the diagnosis code is
reset.
Replace the heater control panel, and erase the
diagnosis code. Then check that no diagnosis code
is being set.

Q: Is the diagnosis code set?

YES :

Replace the heater control unit.

NO :

The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-18

Code No. B1018: Temperature control dial SW error <Vehicles with A/C>

A/C Control Panel Circuit

A/C-ECU

A/C
CONTROL
PANEL

CPU

INTERFACE
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 SI : Silver

ACA00799

AC612706

Connectors: C-15, C-119 <LHD>

AE

C-15 (B)

C-119

AC612710

Connector: C-15 <RHD>

AS

C-15 (B)

AC612711

Connector: C-119 <RHD>

AG

COMMENTS ON TROUBLE SYMPTOM
This code will be set when the temperature control
dial position on the AC control panel is detected as
abnormal.

PROBABLE CAUSES

• Malfunction of the A/C control panel

• Damaged wiring harness or connectors

• Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-119 A/C control
panel connector and C-15 A/C-ECU connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-19

STEP 2. Check the wiring harness between C-119
A/C control panel connector terminal No. 9 and
C-15 A/C-ECU connector terminal No. 9.

• Check the A/C control panel signal line for open

or short circuit.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the wiring harness.

STEP 3. Check whether the diagnosis code is
reset.
Replace the A/C control panel, and erase the diagno-
sis code. Then check that no diagnosis code is being
set.

Q: Is the diagnosis code set?

YES :

Replace the A/C-ECU.

NO :

This diagnosis is complete.

Code No. B1003: Mode dial SW error <Vehicles without A/C>

Heater Control Panel Circuit

HEATER
CONTROL
UNIT

HEATER
CONTROL
PANEL

CPU

INTERFACE
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 SI : Silver

ACA00851

AC612706

Connectors: C-60, C-147 <LHD>

BP

C-60 (B)

C-147

COMMENTS ON TROUBLE SYMPTOM
This code will be set when the air outlet changeover
dial position on the AC control panel is detected as
abnormal.

PROBABLE CAUSES

• Malfunction of the heater control panel

• Damaged wiring harness or connectors

• Malfunction of the heater control unit

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-147 heater control
panel connector and C-60 heater control unit
connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector.

STEP 2. Check the wiring harness between C-147
heater control panel connector terminal No. 9
and C-60 heater control unit connector terminal
No. 9.

• Check the heater control panel signal line for

open or short circuit.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the wiring harness.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-20

STEP 3. Check whether the diagnosis code is
reset.
Replace the heater control panel, and erase the
diagnosis code. Then check that no diagnosis code
is being set.

Q: Is the diagnosis code set?

YES :

Replace the heater control unit.

NO :

The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

Code No. B1003: Mode dial SW error <Vehicles with A/C>

A/C Control Panel Circuit

A/C-ECU

A/C
CONTROL
PANEL

CPU

INTERFACE
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 SI : Silver

ACA00799

AC612706

Connectors: C-15, C-119 <LHD>

AE

C-15 (B)

C-119

AC612710

Connector: C-15 <RHD>

AS

C-15 (B)

AC612711

Connector: C-119 <RHD>

AG

COMMENTS ON TROUBLE SYMPTOM
This code will be set when the air outlet changeover
dial position on the AC control panel is detected as
abnormal.

PROBABLE CAUSES

• Malfunction of the A/C control panel

• Damaged wiring harness or connectors

• Malfunction of the A/C-ECU