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Home › Lexus › 2017 › LS 460 Base, AWD › Repair and Diagnosis › Brakes › Traction Control › Brake Control System - Service Information › Brake Actuator › Inspection [09/2015 - ] › Procedure

Inspection [09/2015 - ]: Procedure

  1. CHECK BRAKE ACTUATOR ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY418128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected:
      (Brake Actuator Assembly)

      HINT: 

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

      Standard resistance

      Tester Connection Condition Specified Condition
      20 (SMC1) - 19 (BS1) Always 15.3 to 25.0 Ω
      6 (SMC2) - 7 (BS2)
      8 (FRA+) - 5 (FRA-) 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-) 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 
    1. Measure the resistance according to the value(s) in the table below.
      GTY644018Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected:
      (Brake Accumulator Pump)

      Standard resistance

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

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

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