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Brake Actuator: Inspection

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK BRAKE ACTUATOR 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying Brake Actuator Connector Terminals
      G05774092Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Perform the check with the actuator at the lowest temperature possible.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      20 (SMC1) -19 (BS1) Always 15.3 to 25.0 Ω
      6 (SMC2) - 7 (BS2)
      8 (FRA+) - 5 (FRA-) Always 3.6 to 6.0 Ω
      22 (FRR+) - 21 (FRR-)
      13 (FLA+) -14 (FLA-)
      27 (FLR+) - 28 (FLR-)
      12 (RRA+) -11 (RRA-)
      10 (RLA+) - 9 (RLA-)
      26 (RRR+) - 25 (RRR-) Always 4.4 to 7.0 Ω
      24 (RLR+) - 23 (RLR-)

      If the result is not as specified, replace the brake actuator.

  2. CHECK BRAKE ACCUMULATOR PUMP 
    Fig 2: Identifying Brake Accumulator Pump Connector Terminals
    G05774093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A2 (BM1) - A4 (GND1) Always 10 Ω or less
      B2 (BM2) - A4 (GND1)
      A2 (BM1) - B2 (BM2) Always Below 1 Ω
      A4 (GND1) - B1 (GND2)
      A2 (BM1) - A1 (MTT) Always 950 to 1050 Ω
      B2 (BM2) - A1 (MTT)

      If the result is not as specified, replace the brake accumulator pump.

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