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HEATED STEERING WHEEL SYSTEM, Diagnostic DTC:B14B7

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DTC Code DTC Name
B14B7 Lost Communication with Steering Heater ECU
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DESCRIPTION

The steering vibration and heater ECU communicates with the air conditioning amplifier assembly via LIN communication.

B14B7 is output when a communication malfunction is detected with the air conditioner amplifier assembly and steering vibration and heater ECU (steering wheel assembly).

DTC No. Detection Item DTC Detection Condition Trouble Area
B14B7 Lost Communication with Steering Heater ECU

  • Diagnosis condition: Power switch on (IG)

  • Malfunction status: Lost communication with air conditioning amplifier assembly and steering vibration and heater ECU

  • Detection time: Continuously for 10 seconds or more

  • Steering wheel assembly

  • Air conditioning amplifier assembly

  • Air conditioning control assembly

  • Spiral with sensor cable sub-assembly

  • Harness or connector
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE


  1. Click here

    CHECK FOR DTCs


    1. Check for DTCs.

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      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      Only DTC B14B7 is output A
      DTC B14B2 and B14B7 are output B

  2. Click here

    CHECK HARNESS AND CONNECTOR (STEERING VIBRATION AND HEATER ECU POWER SOURCE CIRCUIT)


    1. Disconnect the G28 spiral with sensor cable sub-assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G28-4 (BHT) - Body ground Power switch on (IG) 11 to 14 V
      G28-4 (BHT) - Body ground Power switch off Below 1 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G28-2 (EHT) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


    1. Remove the spiral with sensor cable sub-assembly.

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    2. Inspect the spiral with sensor cable sub-assembly.

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      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the G28 spiral with sensor cable sub-assembly connector.

    2. Disconnect the G65 air conditioning amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G28-3 (LIN) - G65-14 (LIN1) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE STEERING WHEEL ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY AND AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the G28 spiral with sensor cable sub-assembly connector.

    2. Disconnect the G65 air conditioning amplifier assembly connector.

    3. Disconnect the G80 air conditioning control assembly connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G28-3 (LIN) - G65-14 (LIN1) Always Below 1 Ω
      G28-3 (LIN), G65-14 (LIN1) or G80-3 (LIN1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      1. Body Electrical > Air Conditioner > Clear DTCs


    2. Disconnect the G80 air conditioning control assembly connector.

    3. Make sure that the DTC detection conditions are met.

      Tip:

      If the detection conditions are not met, the system cannot detect the malfunction.

    4. Check for DTCs.

      Click here


      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      Only DTC B14B2 is output A
      DTC B14B2 and B14B7 are output B

  7. Click here

    CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      1. Body Electrical > Air Conditioner > Clear DTCs


    2. Disconnect the z7 spiral with sensor cable sub-assembly connector.

    3. Make sure that the DTC detection conditions are met.

      Tip:

      If the detection conditions are not met, the system cannot detect the malfunction.

    4. Check for DTCs.

      Click here


      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      Only DTC B14B7 is output A
      DTC B14B2 and B14B7 are output B

  8. Click here

    CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      1. Body Electrical > Air Conditioner > Clear DTCs


    2. Disconnect the G28 spiral with sensor cable sub-assembly connector.

    3. Make sure that the DTC detection conditions are met.

      Tip:

      If the detection conditions are not met, the system cannot detect the malfunction.

    4. Check for DTCs.

      Click here


      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      Only DTC B14B7 is output A
      DTC B14B2 and B14B7 are output B

    • A

      REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLYClick here

    • B

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here