DTC B1081:71, B1082:71 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2816500

System malfunction location	L.H.D.: •  B1081:71: Driver-side air mix actuator motor lock •  B1082:71: Passenger-side air mix actuator motor lock R.H.D.: •  B1081:71: Passenger-side air mix actuator motor lock •  B1082:71: Driver-side air mix actuator motor lock
Detection condition	•  After the air mix actuator drive signal is output, the air mix actuator does not stop within the target air mix actuator opening angle range for a continuous 20 s or more.
Fail-safe function	Malfunction determined when ignition switched ON •  Air mix actuator drive signal is stopped right when the malfunction is determined. Malfunction already exists when ignition switched ON •  Twenty seconds after the ignition is switched ON, the air mix actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.
Possible cause	L.H.D.: •  Connector or terminal malfunction •  Air mix actuator malfunction •  A/C unit (air mix link, air mix door) malfunction •  Open circuit in wiring harness between the following terminals: Driver-side: ―  Climate control unit terminal 1C—air mix actuator terminal G ―  Climate control unit terminal 2K—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal E ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C Passenger-side: ―  Climate control unit terminal 1C—air mix actuator terminal E ―  Climate control unit terminal 2I—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal G ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—Air mix actuator terminal B •  Short to ground in wiring harness between the following terminals: Driver-side: ―  Climate control unit terminal 1C—air mix actuator terminal G ―  Climate control unit terminal 2K—air mix actuator terminal F ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C Passenger-side: ―  Climate control unit terminal 1C—air mix actuator terminal E ―  Climate control unit terminal 2I—air mix actuator terminal F ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—air mix actuator terminal B •  Short to power supply in wiring harness between the following terminals: Driver-side: ―  Climate control unit terminal 1C—air mix actuator terminal G ―  Climate control unit terminal 2K—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal E ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C Passenger-side: ―  Climate control unit terminal 1C—air mix actuator terminal E ―  Climate control unit terminal 2I—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal G ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—air mix actuator terminal B •  Climate control unit malfunction
Possible cause	R.H.D.: •  Connector or terminal malfunction •  Air mix actuator malfunction •  A/C unit (air mix link, air mix door) malfunction •  Open circuit in wiring harness between the following terminals: Driver-side: ―  Climate control unit terminal 1C—air mix actuator terminal E ―  Climate control unit terminal 2I—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal G ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—Air mix actuator terminal B Passenger-side: ―  Climate control unit terminal 1C—air mix actuator terminal G ―  Climate control unit terminal 2K—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal E ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C •  Short to ground in wiring harness between the following terminals: Driver-side: ―  Climate control unit terminal 1C—air mix actuator terminal E ―  Climate control unit terminal 2I—air mix actuator terminal F ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—air mix actuator terminal B Passenger-side: ―  Climate control unit terminal 1C—air mix actuator terminal G ―  Climate control unit terminal 2K—air mix actuator terminal F ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C •  Short to power supply in wiring harness between the following terminals: Driver-side: ―  Climate control unit terminal 1C—air mix actuator terminal E ―  Climate control unit terminal 2I—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal G ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—air mix actuator terminal B Passenger-side: ―  Climate control unit terminal 1C—air mix actuator terminal G ―  Climate control unit terminal 2K—air mix actuator terminal F ―  Climate control unit terminal 1Q—air mix actuator terminal E ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C •  Climate control unit malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED DTC •  Switch the ignition off. •  Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Is DTC B1C1A:12, B1C1A:13, B1C1B:12, B1C1B:13 or U200D:11 also present?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
		No	Go to the next step.
2	INSPECT AIR MIX ACTUATOR CONNECTOR •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the air mix actuator connector. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [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 9.
3	INSPECT AIR MIX ACTUATOR •  Inspect the air mix actuator. (See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) •  Is it normal?	Yes	Go to the next step.
		No	Replace the air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to Step 9.
4	INSPECT AIR MIX LINK OPERATION •  Operate the air mix link manually. •  Does the air mix link operate smoothly?	Yes	Go to the next step.
		No	Replace the air mix link or air mix door. (See A/C UNIT REMOVAL/INSTALLATION.) (See A/C UNIT DISASSEMBLY/ASSEMBLY.) Go to Step 9.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION •  Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [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 9.
6	INSPECT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT •  Climate control unit and air mix actuator connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): Driver-side (L.H.D.): ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C Passenger-side (L.H.D.): ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—air mix actuator terminal B Driver-side (R.H.D.): ―  Climate control unit terminal 2A—air mix actuator terminal C ―  Climate control unit terminal 2C—air mix actuator terminal B Passenger-side (R.H.D.): ―  Climate control unit terminal 1J—air mix actuator terminal B ―  Climate control unit terminal 1L—air mix actuator terminal C •  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 air mix 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 9.
7	INSPECT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO GROUND •  Climate control unit and air mix actuator connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side) and body ground: Driver-side (L.H.D.): ―  Climate control unit terminal 2K ―  Climate control unit terminal 1J ―  Climate control unit terminal 1L Passenger-side (L.H.D.): ―  Climate control unit terminal 2I ―  Climate control unit terminal 2A ―  Climate control unit terminal 2C Driver-side (R.H.D.): ―  Climate control unit terminal 2I ―  Climate control unit terminal 2A ―  Climate control unit terminal 2C Passenger-side (R.H.D.): ―  Climate control unit terminal 2K ―  Climate control unit terminal 1J ―  Climate control unit terminal 1L •  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 air mix 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 9.
		No	Go to the next step.
8	INSPECT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY •  Climate control unit and air mix actuator connectors are disconnected. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition on (engine off or on). •  Measure the voltage at the following terminals (wiring harness-side): Driver-side (L.H.D.): ―  Climate control unit terminal 1J ―  Climate control unit terminal 1L Passenger-side (L.H.D.): ―  Climate control unit terminal 2A ―  Climate control unit terminal 2C Driver-side (R.H.D.): ―  Climate control unit terminal 2A ―  Climate control unit terminal 2C Passenger-side (R.H.D.): ―  Climate control unit terminal 1J ―  Climate control unit terminal 1L •  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 air mix 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 the next step.
9	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Reconnect the disconnected connectors. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  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.
10	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.