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Home >> Lexus >> 2009 >> LX 570 >> Repair and Diagnosis >> Body & Frame >> Seats >> Power Seat Control System (Diagnostics) >> Front Power Seat Control System >> Front Power Seat does not Operate with Front Power Seat Switch >> Procedure
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Front Power Seat does not Operate with Front Power Seat Switch: Procedure

  1. INSPECT FUSE (FR P/SEAT LH, ECU-B2) 
    1. Remove the FR P/SEAT LH fuse from the main body ECU.
    2. Remove the ECU-B2 fuse from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      FR P/SEAT LH fuse Always Below 1 Ω
      ECU-B2 fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH - BATTERY AND BODY GROUND) 
    Fig 1: Identifying c14 And c15 Switch Connectors
    GTY142987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the c14 and c15 switch connectors.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      c14-5 (+B) - Body ground Always 11 to 14 V
      c15-8 (SYSB) - Body ground Always 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c14-1 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. REPLACE POSITION CONTROL ECU AND SWITCH. Refer to  REMOVAL 
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