HEATED STEERING WHEEL SYSTEM, Diagnostic DTC:B14B7

DTC Code DTC Name
B14B7 Lost Communication with Steering Heater ECU

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: Engine 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

WIRING DIAGRAM

B006FRTE06

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.

    Click here

PROCEDURE


  1. CHECK FOR DTCs


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      Only DTC B14B7 is output A
      DTC B14B2 and B14B7 are output B

    B
    A
  2. 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 Engine switch on (IG) 11 to 14 V
      G28-4 (BHT) - Body ground Engine 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

    NG
    OK
  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


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

      Click here

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. 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
    NG
  5. 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

    NG
    OK
  6. CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      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.

      Tech Tips

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

    4. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      Only DTC B14B2 is output A
      DTC B14B2 and B14B7 are output B

    A
    B
  7. CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      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.

      Tech Tips

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

    4. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      Only DTC B14B7 is output A
      DTC B14B2 and B14B7 are output B

    A
    B
  8. CHECK FOR DTCs


    1. Clear the DTCs.

      Click here


      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.

      Tech Tips

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

    4. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      Only DTC B14B7 is output A
      DTC B14B2 and B14B7 are output B

    A
    B