DTC B1B7D:71 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2901200

System malfunction location	• Rear airflow mode actuator motor lock
Detection condition	• Rear airflow mode actuator motor lock
Fail-safe function	Malfunction determined when ignition switched ON • Rear airflow mode actuator drive signal is stopped right when the malfunction is determined. Malfunction already exists when ignition switched ON • Nine seconds after the ignition is switched ON, the rear airflow mode actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.
Possible cause	• Connector or terminal malfunction • Rear airflow mode actuator malfunction • Rear A/C unit (airflow mode link) malfunction • Open circuit in wiring harness between rear climate control unit and rear airflow mode actuator • Short circuit to power supply or body ground in wiring harness between rear climate control unit and rear airflow mode actuator • Rear 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 B1259:12, B1259:13 or U200E:12 also present?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC B1259:12, B1259:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) (See DTC U200E:12 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
1		No	Go to the next step.
2	INSPECT REAR AIRFLOW MODE ACTUATOR CONNECTOR • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the rear airflow mode actuator connector. (See REAR AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
2		No	Repair/replace the connector or terminal. After repair procedure, go to Step 9.
3	INSPECT REAR AIRFLOW MODE ACTUATOR • Inspect the rear airflow mode actuator. (See REAR AIRFLOW MODE ACTUATOR INSPECTION.) • Is it normal?	Yes	Go to the next step.
3		No	Replace the rear airflow mode actuator. (See REAR AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION.) Go to Step 9.
4	INSPECT REAR AIRFLOW MODE LINK OPERATION • Operate the rear airflow mode link manually. • Does the rear airflow mode link operate smoothly?	Yes	Go to the next step.
4		No	Replace the rear airflow mode link. (See REAR A/C UNIT REMOVAL/INSTALLATION.) (See REAR A/C UNIT DISASSEMBLY/ASSEMBLY.) Go to Step 9.
5	INSPECT REAR AIRFLOW MODE ACTUATOR CIRCUIT FOR OPEN CIRCUIT • Disconnect the rear climate control unit connector. (See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect for continuity between the following terminals (wiring harness-side): ? Rear climate control unit terminal A—rear airflow mode actuator terminal D ? Rear climate control unit terminal C—rear airflow mode actuator terminal E • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between rear climate control unit terminal and rear 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 9.
6	INSPECT REAR AIRFLOW MODE ACTUATOR CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ? Rear climate control unit terminal Q ? Rear climate control unit terminal A ? Rear climate control unit terminal C • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between rear climate control unit terminal and rear 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 9.
6		No	Go to the next step.
7	INSPECT REAR AIRFLOW MODE ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY • 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): ? Rear climate control unit terminal A ? Rear climate control unit terminal C • Is the voltage 0 V?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between rear climate control unit terminal and rear 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 9.
8	VERIFY REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
8		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
9	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • 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 rear climate control unit. (See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) Go to the next step.
9		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)].)
10		No	DTC troubleshooting completed.