DTC B1086:71 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2816700

System malfunction location

•  Front airflow mode actuator motor lock

Detection condition

•  After the airflow mode actuator drive signal is output, the airflow mode actuator does not stop within the target mode actuator opening angle range for a continuous 20 s or more.

Fail-safe function

Malfunction determined when ignition switched ON

•  Front airflow mode 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 front airflow mode actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.

Possible cause

R.H.D.:

•  Front airflow mode actuator connector or terminal malfunction

•  Front airflow mode actuator malfunction

•  Front climate control unit connector or terminal malfunction

•  Front climate control unit malfunction

•  A/C unit (airflow mode main link, airflow mode door) malfunction

•  Open circuit in wiring harness between the following terminals:

―  Front climate control unit terminal 1C—front airflow mode actuator terminal C

―  Front climate control unit terminal 1B—front airflow mode actuator terminal B

―  Front climate control unit terminal 1Q—front airflow mode actuator terminal A

―  Front climate control unit terminal 2B—front airflow mode actuator terminal E

―  Front climate control unit terminal 2D—front airflow mode actuator terminal D

•  Short to ground in wiring harness between the following terminals:

―  Front climate control unit terminal 1C—front airflow mode actuator terminal C

―  Front climate control unit terminal 1B—front airflow mode actuator terminal B

―  Front climate control unit terminal 2B—front airflow mode actuator terminal E

―  Front climate control unit terminal 2D—front airflow mode actuator terminal D

•  Short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C—front airflow mode actuator terminal C

―  Front climate control unit terminal 1B—front airflow mode actuator terminal B

―  Front climate control unit terminal 1Q—front airflow mode actuator terminal A

―  Front climate control unit terminal 2B—front airflow mode actuator terminal E

―  Front climate control unit terminal 2D—front airflow mode actuator terminal D

Possible cause

L.H.D.:

•  Front airflow mode actuator connector or terminal malfunction

•  Front airflow mode actuator malfunction

•  Front climate control unit connector or terminal malfunction

•  Front climate control unit malfunction

•  A/C unit (airflow mode main link, airflow mode door) malfunction

•  Open circuit in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q—front airflow mode actuator terminal C

―  Front climate control unit terminal 1B—front airflow mode actuator terminal B

―  Front climate control unit terminal 1C—front airflow mode actuator terminal A

―  Front climate control unit terminal 2D—front airflow mode actuator terminal E

―  Front climate control unit terminal 2B—front airflow mode actuator terminal D

•  Short to ground in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q—front airflow mode actuator terminal C

―  Front climate control unit terminal 1B—front airflow mode actuator terminal B

―  Front climate control unit terminal 2D—front airflow mode actuator terminal E

―  Front climate control unit terminal 2B—front airflow mode actuator terminal D

•  Short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q—front airflow mode actuator terminal C

―  Front climate control unit terminal 1B—front airflow mode actuator terminal B

―  Front climate control unit terminal 1C—front airflow mode actuator terminal A

―  Front climate control unit terminal 2D—front airflow mode actuator terminal E

―  Front climate control unit terminal 2B—front airflow mode actuator terminal D

System malfunction location	• Front airflow mode actuator motor lock
Detection condition	• After the airflow mode actuator drive signal is output, the airflow mode actuator does not stop within the target mode actuator opening angle range for a continuous 20 s or more.
Fail-safe function	Malfunction determined when ignition switched ON • Front airflow mode 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 front airflow mode actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.
Possible cause	R.H.D.: • Front airflow mode actuator connector or terminal malfunction • Front airflow mode actuator malfunction • Front climate control unit connector or terminal malfunction • Front climate control unit malfunction • A/C unit (airflow mode main link, airflow mode door) malfunction • Open circuit in wiring harness between the following terminals: ― Front climate control unit terminal 1C—front airflow mode actuator terminal C ― Front climate control unit terminal 1B—front airflow mode actuator terminal B ― Front climate control unit terminal 1Q—front airflow mode actuator terminal A ― Front climate control unit terminal 2B—front airflow mode actuator terminal E ― Front climate control unit terminal 2D—front airflow mode actuator terminal D • Short to ground in wiring harness between the following terminals: ― Front climate control unit terminal 1C—front airflow mode actuator terminal C ― Front climate control unit terminal 1B—front airflow mode actuator terminal B ― Front climate control unit terminal 2B—front airflow mode actuator terminal E ― Front climate control unit terminal 2D—front airflow mode actuator terminal D • Short to power supply in wiring harness between the following terminals: ― Front climate control unit terminal 1C—front airflow mode actuator terminal C ― Front climate control unit terminal 1B—front airflow mode actuator terminal B ― Front climate control unit terminal 1Q—front airflow mode actuator terminal A ― Front climate control unit terminal 2B—front airflow mode actuator terminal E ― Front climate control unit terminal 2D—front airflow mode actuator terminal D
Possible cause	L.H.D.: • Front airflow mode actuator connector or terminal malfunction • Front airflow mode actuator malfunction • Front climate control unit connector or terminal malfunction • Front climate control unit malfunction • A/C unit (airflow mode main link, airflow mode door) malfunction • Open circuit in wiring harness between the following terminals: ― Front climate control unit terminal 1Q—front airflow mode actuator terminal C ― Front climate control unit terminal 1B—front airflow mode actuator terminal B ― Front climate control unit terminal 1C—front airflow mode actuator terminal A ― Front climate control unit terminal 2D—front airflow mode actuator terminal E ― Front climate control unit terminal 2B—front airflow mode actuator terminal D • Short to ground in wiring harness between the following terminals: ― Front climate control unit terminal 1Q—front airflow mode actuator terminal C ― Front climate control unit terminal 1B—front airflow mode actuator terminal B ― Front climate control unit terminal 2D—front airflow mode actuator terminal E ― Front climate control unit terminal 2B—front airflow mode actuator terminal D • Short to power supply in wiring harness between the following terminals: ― Front climate control unit terminal 1Q—front airflow mode actuator terminal C ― Front climate control unit terminal 1B—front airflow mode actuator terminal B ― Front climate control unit terminal 1C—front airflow mode actuator terminal A ― Front climate control unit terminal 2D—front airflow mode actuator terminal E ― Front climate control unit terminal 2B—front airflow mode actuator terminal D

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY RELATED DTC

•  Switch the ignition off.

•  Perform the DTC inspection for the front climate control unit using the M-MDS.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Is DTC B1C1C:12, B1C1C: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 AIRFLOW MODE ACTUATOR CONNECTOR

•  Switch the ignition off.

•  Disconnect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

•  Disconnect the front airflow mode actuator connector.
(See FRONT AIRFLOW MODE ACTUATOR REMOVAL.)

•  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 AIRFLOW MODE ACTUATOR

•  Inspect the front airflow mode actuator.
(See FRONT AIRFLOW MODE ACTUATOR INSPECTION.)

•  Is it normal?

Yes

Go to the next step.

No

Replace the front airflow mode actuator.

(See FRONT AIRFLOW MODE ACTUATOR REMOVAL.)

(See FRONT AIRFLOW MODE ACTUATOR INSTALLATION.)

Go to Step 9.

4

INSPECT AIRFLOW MODE MAIN LINK OPERATION

•  Operate the airflow mode main link manually.

•  Does the airflow mode main link operate smoothly?

Yes

Go to the next step.

No

Replace the airflow mode main link, or airflow mode door.

(See FRONT A/C UNIT REMOVAL/INSTALLATION.)

(See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.)

Go to Step 9.

5

VERIFY FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  Disconnect the front climate control unit connector.
(See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

•  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 AIRFLOW MODE ACTUATOR CIRCUIT FOR OPEN CIRCUIT

•  Front climate control unit and front airflow mode actuator connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side):

R.H.D.:

―  Front climate control unit terminal 2B—front airflow mode actuator terminal E

―  Front climate control unit terminal 2D—front airflow mode actuator terminal D

L.H.D.:

―  Front climate control unit terminal 2D—front airflow mode actuator terminal E

―  Front climate control unit terminal 2B—front airflow mode actuator terminal D

•  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 front climate control unit terminal and front 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.

7

INSPECT AIRFLOW MODE ACTUATOR CIRCUIT FOR SHORT TO GROUND

•  Front climate control unit and front airflow mode actuator connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:

―  Front climate control unit terminal 1B

―  Front climate control unit terminal 2B

―  Front climate control unit terminal 2D

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front 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.

No

Go to the next step.

8

INSPECT AIRFLOW MODE ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY

•  Front climate control unit and front airflow mode 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):

―  Front climate control unit terminal 2B

―  Front climate control unit terminal 2D

•  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 front climate control unit terminal and front 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 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 front climate control unit memory using the M-MDS.
(See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Perform the DTC inspection for the front 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 front climate control unit.
(See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

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.

STEP	INSPECTION		ACTION
1	VERIFY RELATED DTC • Switch the ignition off. • Perform the DTC inspection for the front climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is DTC B1C1C:12, B1C1C: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)].)
1		No	Go to the next step.
2	INSPECT AIRFLOW MODE ACTUATOR CONNECTOR • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the front airflow mode actuator connector. (See FRONT AIRFLOW MODE ACTUATOR REMOVAL.) • 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 AIRFLOW MODE ACTUATOR • Inspect the front airflow mode actuator. (See FRONT AIRFLOW MODE ACTUATOR INSPECTION.) • Is it normal?	Yes	Go to the next step.
3		No	Replace the front airflow mode actuator. (See FRONT AIRFLOW MODE ACTUATOR REMOVAL.) (See FRONT AIRFLOW MODE ACTUATOR INSTALLATION.) Go to Step 9.
4	INSPECT AIRFLOW MODE MAIN LINK OPERATION • Operate the airflow mode main link manually. • Does the airflow mode main link operate smoothly?	Yes	Go to the next step.
4		No	Replace the airflow mode main link, or airflow mode door. (See FRONT A/C UNIT REMOVAL/INSTALLATION.) (See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.) Go to Step 9.
5	VERIFY FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION • Disconnect the front climate control unit connector. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
5		No	Repair/replace the connector or terminal. After repair procedure, go to step 9.
6	INSPECT AIRFLOW MODE ACTUATOR CIRCUIT FOR OPEN CIRCUIT • Front climate control unit and front airflow mode actuator connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): R.H.D.: ― Front climate control unit terminal 2B—front airflow mode actuator terminal E ― Front climate control unit terminal 2D—front airflow mode actuator terminal D L.H.D.: ― Front climate control unit terminal 2D—front airflow mode actuator terminal E ― Front climate control unit terminal 2B—front airflow mode actuator terminal D • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front 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.
7	INSPECT AIRFLOW MODE ACTUATOR CIRCUIT FOR SHORT TO GROUND • Front climate control unit and front airflow mode actuator connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Front climate control unit terminal 1B ― Front climate control unit terminal 2B ― Front climate control unit terminal 2D • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front 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.
7		No	Go to the next step.
8	INSPECT AIRFLOW MODE ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY • Front climate control unit and front airflow mode 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): ― Front climate control unit terminal 2B ― Front climate control unit terminal 2D • Is the voltage 0 V?	Yes	Go to the next step.
8		No	Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front 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 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 front climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Perform the DTC inspection for the front 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 front climate control unit. (See FRONT 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.