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

DESCRIPTION

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WIRING DIAGRAM

B001I2VE10

PROCEDURE


  1. CHECK STEERING HEATER SWITCH (LED OPERATION)

    B001DFO

    1. Check the illumination condition of the LED.

      Result
      LED Condition Proceed to
      Illuminates

      Engine switch on (IG)

      Heated steering wheel switch is pushed

      		 B
      Does not illuminate

      Engine switch on (IG)

      Heated steering wheel switch is pushed and held continuously for 10 seconds or more

      		 A

    B

    INSPECT STEERING WHEEL ASSEMBLY (HEATER, THERMOSTAT) Click here

    A

  2. INSPECT STEERING WHEEL ASSEMBLY (THERMISTOR)


    1. Disconnect the heated steering wheel controller (built into steering wheel assembly).

    2. B001CWGE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Heated Steering Wheel Controller)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (TH2) - 4 (TH1) 10 to 30 °C(50 to 86°F) 8.132 to 18.43 kΩ

    NG

    REPLACE STEERING WHEEL ASSEMBLY Click here

    OK

  3. INSPECT STEERING WHEEL ASSEMBLY (HEATER, THERMOSTAT)


    1. Disconnect the heated steering wheel controller (built into steering wheel assembly).

    2. B001CWGE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Heated Steering Wheel Controller)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SH1) - 2 (SH2) 20°C (68°F) 1.89 to 2.25 Ω

    NG

    REPLACE STEERING WHEEL ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH - SPIRAL CABLE)


    1. Disconnect the G152 steering heater switch connector.

    2. Disconnect the G151 spiral cable sub-assembly connector.

    3. B001I32E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Heater Switch)
      *b

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G152-5 (INDC) - G151-1 (BTM) Always Below 1 Ω
      G152-4 (RC) - G151-3 (ETM) Always Below 1 Ω
      G151-2 (EHT) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G151-4 (BHT) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR

    OK

  5. INSPECT SPIRAL CABLE SUB-ASSEMBLY

    Note

    If there are any defects as mentioned below, replace the spiral cable sub-assembly with a new one:

    Scratches, cracks, dents or chips in the connector or spiral cable.


    1. Disconnect the G151 spiral cable sub-assembly connector.

    2. Disconnect the heated steering wheel controller (built into steering wheel assembly).

    3. B001GDRE02
      Text in Illustration
      *a

      Component without harness connected

      (Spiral Cable Sub-assembly)
      *b

      Front view of harness connector

      (to Heated Steering Wheel Controller)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (CCU) - G151-1 (BTM) Always Below 1 Ω
      2 (CCV) - G151-3 (ETM) Always Below 1 Ω
      3 (CCX) - G151-2 (EHT) Always Below 1 Ω
      4 (CCW) - G151-4 (BHT) Always Below 1 Ω

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  6. CHECK STEERING HEATER SWITCH


    1. Disconnect the G152 steering heater switch connector.

    2. B001EDIE03
      Text in Illustration
      *a

      Component without harness connected

      (to Steering Heater Switch)

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

      Tech Tips

      As the circuit has a diode, perform the measurement in diode test mode and make sure that the polarity is correct.

      Standard Voltage

      Tester Connection

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

      		 Switch Condition Specified Condition
      G152-1 (IG) - G152-4 (RC) Heated steering wheel switch is pushed Below 1.25 V

    OK

    REPLACE HEATED STEERING WHEEL CONTROLLER (STEERING WHEEL ASSEMBLY) Click here

    NG

    REPLACE STEERING HEATER SWITCH Click here