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

DESCRIPTION

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WIRING DIAGRAM

B001NQWE02

CAUTION / NOTICE / HINT

Tech Tips


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

  • The steering wheel heater unit is built into the steering wheel assembly which cannot be disassembled.

PROCEDURE


  1. CHECK STRG HTR RELAY (STEERING HEATER RELAY)


    1. B001O8KE07
      Text in Illustration
      *1 STRG HTR Relay (Steering Heater Relay)

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

    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

    NG

    REPLACE STRG HTR RELAY (STEERING HEATER RELAY)

    OK

  2. 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.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 - Body ground Always 11 to 14 V
      1 - 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 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH (COMBINATION SWITCH ASSEMBLY) POWER SOURCE)


    1. Disconnect the H37 steering heater switch (combination switch assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H37-9 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK STEERING HEATER SWITCH (COMBINATION SWITCH ASSEMBLY)


    1. B001OKKE05
      Text in Illustration
      *a

      Component without harness connected

      (Steering Heater Switch (Combination Switch Assembly))

      Disconnect the H37 steering heater switch (combination switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      9 (IG) - 3 (IN) Steering heater switch (combination switch assembly) is pushed Below 1 Ω
      9 (IG) - 3 (IN) Steering heater switch (combination switch assembly) is not pushed 10 kΩ or higher

    NG

    REPLACE STEERING HEATER SWITCH (COMBINATION SWITCH ASSEMBLY) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (STRG HTR RELAY (STEERING HEATER RELAY) - SPIRAL CABLE WITH SENCER SUB-ASSEMBLY)


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

    2. Disconnect the H212 spiral cable with sensor sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 - H212-4 (BHT) Always Below 1 Ω
      5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH (COMBINATION SWITCH ASSEMBLY) - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)


    1. Disconnect the H37 steering heater switch (combination switch assembly) connector.

    2. Disconnect the H212 spiral cable with sensor sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H37-4 (+) - H212-1 (BTM) Always Below 1 Ω
      H37-3 (IN) - H212-3 (ETM) Always Below 1 Ω
      H37-4 (+) or H212-1 (BTM)- Body ground Always 10 kΩ or higher
      H37-3 (IN) or H212-3 (ETM)- Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


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

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

    2. Disconnect the H212 and z17 spiral cable with sensor sub-assembly connectors.

      B001O3ME03
      Text in Illustration
      *a

      Component without harness connected

      (Spiral Cable with Sensor Sub-assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z17-2 (BTM) - H212-1 (BTM) Always 3 Ω or less
      z17-3 (ETM) - H212-3 (ETM) Always 3 Ω or less
      z17-1 (EHT) - H212-2 (EHT) Always Below 0.1 Ω
      z17-4 (BHT) - H212-4 (BHT) Always Below 0.1 Ω

    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here

    OK

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


    1. Disconnect the H212 spiral cable with sensor sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H212-2 (EHT) - Body ground Always Below 1 Ω

    OK

    REPLACE STEERING WHEEL ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR