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DTC B10BE:12, B10BE:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

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2016 – MX-5 – HVAC

DTC B10BE:12, B10BE:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

DESCRIPTION

  • B10BE:12

    • Solar radiation sensor circuit short to power supply

  • B10BE:13

    • Solar radiation sensor circuit open

DETECTION CONDITION

  • Malfunction in wiring harness between solar radiation sensor and climate control unit

FAIL-SAFE FUNCTION

    Malfunction determined when IG SW at ON

  • The solar radiation sensor input value is fixed at the value directly before the malfunction only when the valve is 1,450 W/m2 or more.

    Malfunction already exists when IG SW turned to ON

  • Solar radiation sensor value is fixed at 0 W/m2.

POSSIBLE CAUSE

  • Solar radiation sensor connector malfunction

  • Solar radiation sensor malfunction

  • Open circuit in wiring harness between climate control unit and solar radiation sensor

  • Short to power supply in wiring harness between climate control unit and solar radiation sensor

  • Climate control unit connector malfunction

  • Climate control unit malfunction

SYSTEM WIRING DIAGRAM

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT SOLAR RADIATION SENSOR CONNECTOR

  • Switch the ignition to off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the solar radiation sensor connector.

  • 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 SOLAR RADIATION SENSOR

Yes

Go to the next step.

No

Replace the solar radiation sensor.

(See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Go to the next step.

3

INSPECT SOLAR RADIATION SENSOR CIRCUIT FOR OPEN CIRCUIT

  • Disconnect the climate control unit connector and the solar radiation sensor connector.

  • Is there continuity between the following terminals of the climate control unit and the solar radiation sensor?

    • H???A

    • K???B

Yes

Go to the next step.

No

Repair the wiring harness.

Go to the next step.

4

INSPECT SOLAR RADIATION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY

  • Connect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Switch the ignition to ON.

  • Measure the voltage of solar radiation sensor connector terminals A and B of solar radiation sensor harness side connector.

  • Is the voltage measured?

Yes

Repair the wiring harness.

Go to the next step.

No

Go to the next step.

5

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

  • Switch the ignition to off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • 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

  • Verify other DTCs displayed.

  • Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

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