DTC B1C1A:11, B1C1A:13, B1C1B:11, B1C1B:13 [FULL-AUTO AIR CONDITIONER]

id0702c1817500

System malfunction location (L.H.D.)

•  B1C1A:11: Driver-side air mix actuator (potentiometer) circuit short to ground

•  B1C1A:13: Driver-side air mix actuator (potentiometer) circuit open

•  B1C1B:11: Passenger-side air mix actuator (potentiometer) circuit short to ground

•  B1C1B:13: Passenger-side air mix actuator (potentiometer) circuit open

System malfunction location (R.H.D.)

•  B1C1A:11: Passenger-side air mix actuator (potentiometer) circuit short to ground

•  B1C1A:13: Passenger-side air mix actuator (potentiometer) circuit open

•  B1C1B:11: Driver-side air mix actuator (potentiometer) circuit short to ground

•  B1C1B:13: Driver-side air mix actuator (potentiometer) circuit open

Detection condition

•  Malfunction in wiring harness between air mix actuator and climate control unit

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

•  Control based on ambient temperature.

Possible cause

•  Connector or terminal malfunction

•  Air mix actuator malfunction

•  Open circuit in wiring harness between climate control unit and air mix actuator

•  Short to power supply in wiring harness between climate control unit and air mix actuator

•  Climate control unit malfunction

System malfunction location (L.H.D.)	• B1C1A:11: Driver-side air mix actuator (potentiometer) circuit short to ground • B1C1A:13: Driver-side air mix actuator (potentiometer) circuit open • B1C1B:11: Passenger-side air mix actuator (potentiometer) circuit short to ground • B1C1B:13: Passenger-side air mix actuator (potentiometer) circuit open
Detection condition	• Malfunction in wiring harness between air mix actuator and climate control unit
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 • Control based on ambient temperature.
Possible cause	• Connector or terminal malfunction • Air mix actuator malfunction • Open circuit in wiring harness between climate control unit and air mix actuator • Short to power supply in wiring harness between climate control unit and air mix actuator • Climate control unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT AIR MIX 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 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 the next step.

2

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 the next step.

3

INSPECT AIR MIX ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT

•  Disconnect the climate control unit connector.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

•  Disconnect the air mix actuator connector.
(See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

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

Driver-side (L.H.D.), Passenger-side (R.H.D.)

―  Climate control unit terminal 1N—air mix actuator terminal G

―  Climate control unit terminal 2G—air mix actuator terminal F

―  Climate control unit terminal 1J—air mix actuator terminal E

Passenger-side (L.H.D.), Driver-side (R.H.D.)

―  Climate control unit terminal 1N—air mix actuator terminal E

―  Climate control unit terminal 2E—air mix actuator terminal F

―  Climate control unit terminal 1J—air mix actuator terminal G

•  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 the next step.

4

INSPECT AIR MIX ACTUATOR (POTENTIOMETER) SHORT TO GROUND

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

Driver-side (L.H.D.), Passenger-side (R.H.D.)

―  Climate control unit 2G

Passenger-side (L.H.D.), Driver-side (R.H.D.)

―  Climate control unit 2E

•  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 the next step.

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 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.
(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 past malfunction from memory.
(See CLEARING DTC [FULL-AUTO AIR CONDITIONER].)

•  Verify DTCs.
(See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].)

•  Is DTC B1C1A:11, B1C1A:13, B1C1B:11 or B1C1B: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.
(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.
(See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].)

•  Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [FULL-AUTO AIR CONDITIONER].)

No

DTC troubleshooting completed.

System malfunction location (L.H.D.)	• B1C1A:11: Driver-side air mix actuator (potentiometer) circuit short to ground • B1C1A:13: Driver-side air mix actuator (potentiometer) circuit open • B1C1B:11: Passenger-side air mix actuator (potentiometer) circuit short to ground • B1C1B:13: Passenger-side air mix actuator (potentiometer) circuit open
System malfunction location (R.H.D.)	• B1C1A:11: Passenger-side air mix actuator (potentiometer) circuit short to ground • B1C1A:13: Passenger-side air mix actuator (potentiometer) circuit open • B1C1B:11: Driver-side air mix actuator (potentiometer) circuit short to ground • B1C1B:13: Driver-side air mix actuator (potentiometer) circuit open
Detection condition	• Malfunction in wiring harness between air mix actuator and climate control unit
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 • Control based on ambient temperature.
Possible cause	• Connector or terminal malfunction • Air mix actuator malfunction • Open circuit in wiring harness between climate control unit and air mix actuator • Short to power supply in wiring harness between climate control unit and air mix actuator • Climate control unit malfunction

Step	Inspection		Action
1	INSPECT AIR MIX 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 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.
1		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
2	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.
2		No	Replace the air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
3	INSPECT AIR MIX ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT • Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) • Disconnect the air mix actuator connector. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) • Inspect for continuity between the following terminals (wiring harness-side): Driver-side (L.H.D.), Passenger-side (R.H.D.) ― Climate control unit terminal 1N—air mix actuator terminal G ― Climate control unit terminal 2G—air mix actuator terminal F ― Climate control unit terminal 1J—air mix actuator terminal E Passenger-side (L.H.D.), Driver-side (R.H.D.) ― Climate control unit terminal 1N—air mix actuator terminal E ― Climate control unit terminal 2E—air mix actuator terminal F ― Climate control unit terminal 1J—air mix actuator terminal G • Is there continuity?	Yes	Go to the next step.
3		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 the next step.
4	INSPECT AIR MIX ACTUATOR (POTENTIOMETER) SHORT TO GROUND • Inspect for continuity between the following terminals (wiring harness-side) and body ground: Driver-side (L.H.D.), Passenger-side (R.H.D.) ― Climate control unit 2G Passenger-side (L.H.D.), Driver-side (R.H.D.) ― Climate control unit 2E • 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 the next step.
4		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.
5		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. (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 past malfunction from memory. (See CLEARING DTC [FULL-AUTO AIR CONDITIONER].) • Verify DTCs. (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].) • Is DTC B1C1A:11, B1C1A:13, B1C1B:11 or B1C1B: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. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].) • Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
7		No	DTC troubleshooting completed.