System malfunction location

• B13AB:12: Air mix actuator (potentiometer) circuit short to power supply

• B13AB:13: 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 IG SW at ON

• Air mix actuator drive signal is stopped right when the malfunction is determined. When the set temperature is 18.0 °C {64.0 °F}, it is fixed at MAX COLD, and when it is 32.0 °C {90.0 °F}, it is fixed MAX HOT.

Malfunction already exists when IG SW turned to ON

• Control based on ambient temperature.When the set temperature is 18.0 °C {64.0 °F}, it is fixed at MAX COLD, and when it is 32.0 °C {90.0 °F}, it is fixed MAX HOT.

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

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the air mix actuator connector.

  (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [MANUAL 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 the air mix actuator.

  (See AIR MIX ACTUATOR INSPECTION [MANUAL AIR CONDITIONER].)

• Is it normal?

Yes

Go to the next step.

No

Replace the air mix actuator.

(See AIR MIX ACTUATOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

Go to the next step.

3

• Disconnect the climate control unit connector.

  (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

• Disconnect the air mix actuator connector.

  (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

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

• Climate control unit terminal H???air mix actuator terminal D

• Climate control unit terminal G???air mix actuator terminal E

• Climate control unit terminal E???air mix actuator terminal F

• 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

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• 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 G

• 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 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.

5

• 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

• Reconnect the disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear the past malfunction from memory.

  (See CLEARING DTC [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

• Verify DTCs.

  (See DTC DISPLAY [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

• Is DTC B13AB:12, B13AB: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 [MANUAL AIR CONDITIONER].)

Go to the next step.

No

Go to the next step.

7

• Verify other DTCs displayed.

  (See DTC DISPLAY [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

• Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

No

DTC troubleshooting completed.