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Home >> Lexus >> 2008 >> GS 350 RWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat >> Seat Heater Control >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT FRONT SEAT HEATER CONTROL LH 
    1. Disconnect the b2 connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Specified Condition
      b2-6 (E) - Body ground Below 1 Ω
      Fig 1: Identifying Front Seat Heater Control Connector Terminals LH
      G05300488Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      b2-1 (SWL) - b2-6 (E) Engine switch on (IG), seat heater switch OFF Below 1 V
      b2-1 (SWL) - b2-6 (E) Engine switch on (IG), seat heater switch ON 10 to 14 V
      b2-4 (B) - b2-6 (E) Engine switch off Below 1 V
      b2-4 (B) - b2-6 (E) Engine switch on (IG) 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    4. Reconnect the b2 connector.
    5. Measure the voltage of the connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      b2-5 (THL) - Body ground Engine switch on (IG), seat heater switch volume 0 → 3 Gradual increase between below 1 V and 10 to 14 V

      If the result is not as specified, the seat heater control may have a malfunction.

  2. INSPECT FRONT SEAT HEATER CONTROL RH 
    1. Disconnect the a2 connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Specified Condition
      a2-6 (E) - Body ground Below 1 Ω
      Fig 2: Identifying Front Seat Heater Control Connector Terminals RH
      G05300489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      a2-1 (SWR) - a2-6 (E) Engine switch on (IG), seat heater switch OFF Below 1 V
      a2-1 (SWR) - a2-6 (E) Engine switch on (IG), seat heater switch ON 10 to 14 V
      a2-4 (B) - a2-6 (E) Engine switch off Below 1 V
      a2-4 (B) - a2-6 (E) Engine switch on (IG) 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    4. Reconnect the a2 connector.
    5. Measure the voltage of the connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      a2-5 (THL) - Body ground Engine switch on (IG), seat heater switch volume 0 → 3 Gradual increase between below 1 V and 10 to 14 V

      If the result is not as specified, the seat heater control may have a malfunction.

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