DTC B1C1C:11, B1C1C:13 [FULL-AUTO AIR CONDITIONER]

id0702c1817200

DTC B1C1C:11

Airflow mode actuator (potentiometer) circuit short to ground

DTC B1C1C:13

Airflow mode actuator (potentiometer) circuit open
POSSIBLE CAUSE
•  Connector or terminal malfunction
•  Airflow mode actuator malfunction
•  Open circuit in wiring harness between climate control unit connector terminal 1C and airflow mode actuator connector terminal B
•  Open circuit in wiring harness between climate control unit connector terminal 1K and airflow mode actuator connector terminal C
•  Open circuit in wiring harness between climate control unit connector terminal 1E and airflow mode actuator connector terminal A
•  Short to ground in wiring harness between climate control unit connector terminal 1K and airflow mode actuator connector terminal C
•  Climate control unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT AIRFLOW MODE ACTUATOR CONNECTOR
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the airflow mode actuator connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Are the connector and terminals normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to the next step.
2
INSPECT AIRFLOW MODE ACTUATOR
•  Inspect the airflow mode actuator.
•  Is it normal?
Yes
Go to the next step.
No
Replace the airflow mode actuator.
(See AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
Go to the next step.
3
INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the climate control unit connector and the airflow mode actuator connector.
•  Is there an open circuit in the wiring harness between the following terminals of the climate control unit and the airflow mode actuator?
―  1C—B
―  1K—C
―  1E—A
Yes
Repair the wiring harness.
Go to the next step.
No
Go to the next step.
4
INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) SHORT TO GROUND
•  Is there a short circuit to ground in the wiring harness between climate control unit terminal 1K and airflow mode actuator terminal C?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to the next step.
No
The system is normal at present.
Go to the next step.
5
VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Are the connector and terminals normal?
Yes
Go to the next step.
No
Repair/replace the malfunctioning vehicle wiring harness, connector, or terminal.
After repair procedure, go to the next step.
6
VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
•  Reconnect the disconnected connectors.
•  Connect the negative battery cable.
•  Clear the past malfunction from memory.
•  Verify DTCs.
•  Is DTC B1C1C:11, B1C1C:13 output?
Yes
Repeat the inspection from Step 1.
•  If the malfunction does not recur, go to the next step.
•  If the malfunction recurs, replace the climate control unit.
Go to the next step.
No
Go to the next step.
7
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Verify other DTCs displayed.
•  Are any other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.