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Seat Heater Control: Inspection

  1. INSPECT FRONT SEAT HEATER CONTROL LH 
    1. Disconnect the seat heater control LH connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U16-6 (E) - Body ground Always Below 1 Ω

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U16-1 (SWL) - U16-6 (E) Engine switch on (IG), seat heater switch OFF → ON 0 V → 10 to 14 V
      U16-4 (B) - U16-6 (E) Engine switch off → on (IG) 0 V → 10 to 14 V
      Fig 1: Identifying U16 Connector Terminals
      G05254160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the seat heater control LH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U16-5 (THL) - U16-6 (E) Engine switch on (IG), seat heater switch volume 1 → 3 Gradual increase 0 V → 10 to 14 V
  2. INSPECT FRONT SEAT HEATER CONTROL RH 
    1. Disconnect the seat heater control RH connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T18-6 (E) - Body ground Always Below 1 Ω

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T18-1 (SWR) - T18-6 (E) Engine switch on (IG), seat heater switch OFF → ON 0 V → 10 to 14 V
      T18-4 (B1) - T18-6 (E) Engine switch off → on (IG) 0 V → 10 to 14 V
      Fig 2: Identifying T18 Connector Terminals
      G05254161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the seat heater control RH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T18-5 (THR) - T18-6 (E) Engine switch on (IG), seat heater switch volume 1 → 3 Gradual increase 0 V → 10 to 14 V
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