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

SYSTEM DESCRIPTION

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WIRING DIAGRAM

A01GZOOE01

INSPECTION PROCEDURE

Note

Inspect the fuses of this circuit before performing troubleshooting.

PROCEDURE


  1. INSPECT STEERING WHEEL ASSEMBLY


    1. A01GX9FE02
      Text in Illustration
      *a

      Component without harness connected

      (Steering wheel assembly)

      Disconnect the B steering wheel assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B1(TH1) - B2(TH2) 10 to 30°C (50 to 86°F) 8.132 to 18.43 kΩ
      B4(SH1) - B3(SH2) 20°C (68°F) 1.89 to 2.25 Ω

    NG

    REPLACE STEERING WHEEL ASSEMBLY

    OK

  2. INSPECT SPIRAL CABLE


    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. Disconnect the L23 and z13 spiral with sensor cable subassembly connectors.

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

      A01H09PE12
      Standard Resistance
      Tester Connection Condition Specified Condition
      z13-1 - L23-1(BTM) Always Below 3 Ω
      z13-2 - L23-3(ETM) Always Below 3 Ω
      z13-3 - L23-2(EHT) Always Below 0.1 Ω
      z13-4 - L23-4(BHT) Always Below 0.1 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Spiral with Sensor Cable Sub-assembly)

    NG

    REPLACE SPIRAL CABLE

    OK

  3. INSPECT OUTER MIRROR SWITCH ASSEMBLY


    1. A01GXYPE04
      Text in Illustration
      *a

      Component without harness connected

      Outer Mirror Switch (Steering Heater Switch)

      Disconnect the L6 outer mirror switch.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L6-1(E) - L6-9(STHS) Outer Mirror Switch (Steering Heater Switch) is pushed Below 1 Ω
      Outer Mirror Switch (Steering Heater Switch) is not pushed 10 kΩ or higher

    NG

    REPLACE OUTER MIRROR SWITCH ASSEMBLY

    OK

  4. CHECK HARNESS AND CONNECTOR


    1. Disconnect the L6 outer mirror switch.

    2. Disconnect the L76 air conditioning amplifier assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L6-5(STHI) - L76-9(SHOT) Always Below 1 Ω
      L6-9(STHS) - L76-30(SHSI) Always Below 1 Ω
      L6-5(STHI) or L76-9(SHOT) - Body ground Always 10 kΩ or higher
      L6-9(STHS) or L76-30(SHSI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR


    1. Disconnect the L6 outer mirror switch.

    2. A01GW6EE01
      Text in Illustration
      *a Component without harness connected

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L6-12(B) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR


    1. Disconnect the L6 outer mirror switch.

    2. A01GW6EE02
      Text in Illustration
      *a Component without harness connected

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L6-1(E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR


    1. Disconnect the L23 spiral with sensor cable subassembly connector.

    2. A01GYIZE01
      Text in Illustration
      *a Component without harness connected

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L23-4(BHT) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR


    1. Disconnect the L76 air conditioning amplifier assembly.

    2. Disconnect the L23 spiral with sensor cable subassembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L76-31(SHIN) - L23-1(BTM) Always Below 1 Ω
      L76-34(SHSO) - L23-3(ETM) Always Below 1 Ω
      L76-31(SHIN) or L23-1(BTM) - Body ground Always 10 kΩ or higher
      L76-34(SHSO) or L23-3(ETM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR


    1. Disconnect the L23 spiral with sensor cable subassembly connector.

    2. A01GYIZE02
      Text in Illustration
      *a Component without harness connected

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L23-2(EHT) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Connect the L76 air conditioning amplifier assembly connector.

    2. A01GW4KE01
      Text in Illustration
      *a

      Component with harness connected

      (Air conditioning amplifier assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L76-9 (SHOT) - L76-1(GND)

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) OFF

      		 11 to 14 V

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) ON

      		 Below 1 V
      L76-30 (SHSI) - L76-1(GND)

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) OFF

      		 4.75 to 5.25 V

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) ON

      		 Below 1 V
      L76-31 (SHIN) - L76-1(GND)

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) OFF

      		 4.75 to 5.25 V

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) ON

      		 Below 1 V
      L76-34 (SHSO) - L76-1(GND)

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) OFF

      		 Below 1 V

      Power switch on (IG)

      Outer Mirror Switch (Steering Heater Switch) ON

      		 11 to 14 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    OK

    REPLACE STEERING WHEEL HEATER CONTROL ASSEMBLY