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 ).