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DTC B13AA:71 [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)]

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2016 – MX-5 – HVAC

DTC B13AA:71 [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)]

System malfunction location

  • Air mix actuator motor lock

Detection condition

  • Air mix actuator motor lock

Fail-safe function

    Malfunction determined when IG SW at ON

  • Air mix actuator drive signal is stopped right when the malfunction is determined.

    Malfunction already exists when IG SW turned to 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

  • Connector or terminal malfunction

  • Air mix actuator malfunction

  • A/C unit (air mix link and air mix crank) malfunction

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

  • Short to ground 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

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

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

INSPECT AIR MIX LINK OPERATION

  • Operate the air mix link manually.

  • Does the air mix link operate smoothly?

Yes

Reconnect the disconnected connector, then go to the next step.

No

Replace the air mix link and the air mix crank.

(See A/C UNIT DISASSEMBLY/ASSEMBLY.)

Go to the next step.

4

INSPECT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

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 or short to ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit or short to ground.

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

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

7

VERIFY THAT NO OTHER DTCs ARE PRESENT

Yes

Perform the corresponding DTC inspection.

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

No

DTC troubleshooting completed.

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