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HEATED STEERING WHEEL SYSTEM Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed

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DTC Code DTC Name
  Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed
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DESCRIPTION

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

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

  • The steering heater unit is built into the steering wheel assembly which cannot be disassembled. Therefore, when the steering heater unit has a malfunction, replace the steering wheel assembly.

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PROCEDURE


  1. Click here

    INSPECT STEERING WHEEL ASSEMBLY (THERMISTOR·HEATER·THERMOSTAT)


    1. A015BREE01

      Disconnect the B steering wheel controller connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-1 (TH1) - B-2 (TH2) 10 to 30°C (50 to 86°F) 8.132 to 18.43 kΩ
      B-4 (SH1) - B-3 (SH2) 20°C (68°F) 1.89 to 2.25 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Wheel Control Assembly)

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    INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


    1. Check the connectors and cables of the spiral with sensor cable sub-assembly.

      OK
      There are no defects such as scratches, cracks, dents or damage on the connectors or cables.
    2. A015DGYE05

      Disconnect the E107 and z63 spiral with sensor cable sub-assembly connectors.

    3. Disconnect the heated steering wheel controller connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z63-1 (CCU) - E107-1 (BTM) Always Below 1 Ω
      z63-2 (CCV) - E107-3 (ETM) Always Below 1 Ω
      z63-3 (CCX) - E107-2 (EHT) Always Below 1 Ω
      z63-4 (CCW) - E107-4 (BHT) Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (Spiral with Sensor Cable Sub-assembly)

      		 - -

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    CHECK STEERING HEATER SWITCH


    1. A0155BXE04

      Disconnect the G14 steering heater switch connector.

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

      Tip:

      As the circuit has a diode, perform the measurement in diode test mode, and do not mistake the polarity.

      Standard Voltage

      Tester Connection

      (Positive (+) tester probe - Negative (-) tester probe)

      		 Condition Specified Condition
      G14-3 (IG) - G14-7 (+) Always Below 1.25 V
      G14-6 (IN) - G14-7 (+) Steering heater switch is pushed Below 1.25 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G14-3 (IG) - G14-6 (IN) Steering heater switch is pushed Below 1 Ω
      G14-3 (IG) - G14-6 (IN) Steering heater switch is not pushed 10 kΩ or higher
      Table 3. Text in Illustration
      *a

      Component without harness connected

      (Steering Heater Switch)

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    CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH - SPIRAL W/ SENSOR CABLE SUB-ASSEMBLY)


    1. Disconnect the G14 steering heater switch connector.

    2. Disconnect the E107 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G14-7 (+) - E107-1 (BTM) Always Below 1 Ω
      G14-6 (IN) - E107-3 (ETM) Always Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (IG CIRCUIT)


    1. Disconnect the G14 steering heater switch connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G14-3 (IG) - Body ground Ignition switch ON 11 to 14 V

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    CHECK HARNESS AND CONNECTOR (IG CIRCUIT)


    1. Disconnect the E107 spiral with sensor cable subassembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E107-4 (BHT) - Body ground Ignition switch ON 11 to 14 V

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    CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY BODY GROUND)


    1. Disconnect the E107 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E107-2 (EHT) - Body ground Always Below 1 Ω

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    REPLACE STEERING WHEEL HEATER CONTROL ASSEMBLYClick here

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    REPLACE STEERING WHEEL ASSEMBLYClick here

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    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLYClick here

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    REPLACE STEERING HEATER SWITCHClick here

  12. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR