DTC B1C1C:11, B1C1C:12, B1C1C:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2210100

With Dual Type Climate Control Unit

System malfunction location	•  B1C1C:11: Airflow mode actuator (potentiometer) circuit short to ground •  B1C1C:13: Airflow mode actuator (potentiometer) circuit open
Detection condition	•  Malfunction in wiring harness between airflow mode actuator and climate control unit
Fail-safe	Malfunction determined when IG SW at ON •  Airflow mode actuator drive signal is stopped right when the malfunction is determined. Malfunction already exists when IG SW turned to ON •  Control based on ambient temperature.
Possible cause	•  Connector or terminal malfunction •  Airflow mode actuator malfunction •  Open circuit in wiring harness between the following terminals: ―  Climate control unit terminal 1N—airflow mode actuator terminal B ―  Climate control unit terminal 2A—airflow mode actuator terminal C ―  Climate control unit terminal 1J—airflow mode actuator terminal A •  Short to ground in wiring harness between the following terminals: ―  Climate control unit terminal 1N—airflow mode actuator terminal B ―  Climate control unit terminal 2A—airflow mode actuator terminal C •  Climate control unit malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT AIRFLOW MODE ACTUATOR CONNECTOR •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Disconnect the airflow mode actuator connector. (See AIRFLOW MODE ACTUATOR REMOVAL [FULL-AUTO AIR CONDITIONER].) •  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 Step 6.
2	INSPECT AIRFLOW MODE ACTUATOR •  Inspect the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) •  Is it normal?	Yes	Go to the next step.
		No	Replace the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to Step 6.
3	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT •  Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) •  Inspect for continuity between the following terminals (wiring harness-side): ―  Climate control unit terminal 1N—airflow mode actuator terminal B ―  Climate control unit terminal 2A—airflow mode actuator terminal C ―  Climate control unit terminal 1J—airflow mode actuator terminal A •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode actuator terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 6.
4	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR SHORT TO GROUND •  Inspect for continuity between the following terminals (wiring harness-side) and body ground: ―  Climate control unit terminal 1N ―  Climate control unit terminal 2A •  Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode actuator terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to ground. Go to Step 6.
		No	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 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. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) 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 displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
		No	DTC troubleshooting completed.

With Single Type Climate Control Unit

System malfunction location	•  B1C1C:12: Airflow mode actuator (potentiometer) circuit short to power supply •  B1C1C:13: Airflow mode actuator (potentiometer) circuit open
Detection condition	•  Malfunction in wiring harness between airflow mode actuator and climate control unit
Fail-safe function	Malfunction determined when ignition switched ON •  Airflow mode actuator drive signal is stopped right when the malfunction is determined. Malfunction already exists when ignition switched ON •  Control based on ambient temperature.
Possible cause	•  Connector or terminal malfunction •  Airflow mode actuator malfunction •  Open circuit in wiring harness between the following terminals: ―  Climate control unit terminal H—airflow mode actuator terminal B ―  Climate control unit terminal I—airflow mode actuator terminal C ―  Climate control unit terminal E—airflow mode actuator terminal A •  Short to power supply in wiring harness between the following terminals: ―  Climate control unit terminal H—airflow mode actuator terminal B ―  Climate control unit terminal I—airflow mode actuator terminal C ―  Climate control unit terminal E—airflow mode actuator terminal A •  Climate control unit malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT AIRFLOW MODE ACTUATOR CONNECTOR •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Disconnect the airflow mode actuator connector. (See AIRFLOW MODE ACTUATOR REMOVAL [FULL-AUTO AIR CONDITIONER].) •  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 Step 6.
2	INSPECT AIRFLOW MODE ACTUATOR •  Inspect the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) •  Is it normal?	Yes	Go to the next step.
		No	Replace the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to Step 6.
3	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT •  Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) •  Inspect for continuity between the following terminals (wiring harness-side): ―  Climate control unit terminal H—airflow mode actuator terminal B ―  Climate control unit terminal I—airflow mode actuator terminal C ―  Climate control unit terminal E—airflow mode actuator terminal A •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode actuator terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 6.
4	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR SHORT TO POWER SUPPLY •  Connect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Switch the ignition ON (engine off or on). •  Measure the voltage at the following terminals (wiring harness-side): ―  Climate control unit terminal H ―  Climate control unit terminal I ―  Climate control unit terminal E •  Is the voltage 0 V?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode actuator terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to power supply. Go to Step 6.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  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.
6	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN •  Reconnect the disconnected connectors. •  Connect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) 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 displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
		No	DTC troubleshooting completed.