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HEATED STEERING WHEEL SYSTEM(w/o Lane Departure Alert 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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CAUTION / NOTICE / HINT

Tip:

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

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

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PROCEDURE


  1. Click here

    INSPECT STEERING WHEEL HEATER UNIT (THERMISTOR/HEATER/THERMOSTAT)


    1. B0067LDC03
      *a Front view of wire harness connector (to Steering Wheel Heater Control Assembly)

      Disconnect the B steering wheel heater control assembly 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
      Result
      Proceed to
      OK
      NG

  2. Click here

    INSPECT SPIRAL CABLE SUB-ASSEMBLY


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

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

    2. Disconnect the O144 and z9 spiral cable sub-assembly connectors.

    3. B0065GFC05
      *a

      Component without harness connected

      (Spiral Cable Sub-assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z9-1 (BTM) - O144-1 (BTM) Always 3 Ω or less
      z9-2 (ETM) - O144-3 (ETM) Always 3 Ω or less
      z9-3 (EHT) - O144-2 (EHT) Always Below 0.1 Ω
      z9-4 (BHT) - O144-4 (BHT) Always Below 0.1 Ω
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK STEERING HEATER SWITCH (REFRESHING SEAT SWITCH)


    1. B0067F1C05
      *a Component without harness connected (Steering Heater Switch (Refreshing Seat Switch))

      Disconnect the O94 steering heater switch (refreshing seat switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (IG) - 5 (IN) Steering heater switch (refreshing seat switch) is pushed Below 200 Ω
      1 (IG) - 5 (IN) Steering heater switch (refreshing seat switch) is not pushed 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK STRG HTR RELAY (STEERING HEATER RELAY)


    1. B0067ZTC01
      *1 STRG HTR Relay (Steering Heater Relay)

      Remove the STRG HTR relay (steering heater relay) from the No. 2 engine room relay block and No. 2 junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE STRG HTR RELAY (STEERING HEATER RELAY)

  5. Click here

    CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH (REFRESHING SEAT SWITCH) - SPIRAL CABLE SUB-ASSEMBLY)


    1. Disconnect the O94 steering heater switch (refreshing seat switch) connector.

    2. Disconnect the O144 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O94-3 (+) - O144-1 (BTM) Always Below 1 Ω
      O94-5 (IN) - O144-3 (ETM) Always Below 1 Ω
      O94-3 (+) or O144-1 (BTM) - Body ground Always 10 kΩ or higher
      O94-5 (IN) or O144-3 (ETM) - 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 HARNESS AND CONNECTOR (STRG HTR RELAY (STEERING HEATER RELAY) - SPIRAL CABLE SUB-ASSEMBLY)


    1. Remove the STRG HTR relay (steering heater relay) from the No. 2 engine room relay block and No. 2 junction block assembly.

    2. Disconnect the O144 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (STRG HTR relay) - O144-4 (BHT) Always Below 1 Ω
      5 (STRG HTR relay) or O144-4 (BHT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH (REFRESHING SEAT SWITCH) POWER SOURCE)


    1. Disconnect the O94 steering heater switch (refreshing seat switch) connector.

    2. B006554C03
      *a

      Front view of wire harness connector

      (to Steering Heater Switch (Refreshing Seat Switch))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O94-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    CHECK HARNESS AND CONNECTOR (STRG HTR RELAY (STEERING HEATER RELAY) POWER SOURCE)


    1. Remove the STRG HTR relay (steering heater relay) from the No. 2 engine room relay block and No. 2 junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (STRG HTR relay) - Body ground Always 11 to 14 V
      1 (STRG HTR relay) - Body ground Engine switch on (IG) 11 to 14 V

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

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

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

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


    1. Disconnect the O144 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O144-2 (EHT) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE STEERING WHEEL HEATER CONTROL ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR