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Diagnosis System

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.
Fig 1: Identifying ABS Warning Light And Brake Indicator Light
G04949591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. DIAGNOSIS 
    1. If the skid control ECU detects a malfunction, it will warn the driver by turning on the ABS warning light, brake warning light / red (malfunction) and brake warning light / yellow (minor malfunction) and slip and brake hold standby indicator light. It also warns the driver with the indication on the multi-information display

      The table below indicates which lights will come on when there is a malfunction in a particular function

      ABS AND EBD TROUBLE AREA REFERENCE

      Item / Trouble Area ABS EBD TR(A)C/VSC Brake Hold Standby
      ABS Warning Light ◦ ◦ - -
      Brake Warning Light / Red (Malfunction) - ◦ - -
      Brake Warning Light / Yellow (Minor Malfunction) - ◦ - -
      Slip Indicator Light ◦ ◦ ◦ ◦
      Multi-information Display ◦ ◦ ◦ ◦
      Brake Hold Standby Indicator Light ◦ ◦ ◦ ◦
      HINT:
      • ◦ Light ON
      • -. Light OFF
      • The DTCs are simultaneously stored in the memory The DTCs can be read by connecting SST between terminals 13 (TC) and 4 (CG) of the DLC3 and observing the blinking pattern of the ABS warning light and brake warning light / yellow (minor malfunction), or indication on the multi-information display, or by connecting the intelligent tester or Techstream
      • This system has a signal check function. The DTC can be read by connecting the intelligent tester or Techstream and observing the blinking pattern of the ABS warning light and brake warning light / yellow (minor malfunction) or by reading the multi-information display.
  2. WARNING LIGHT AND INDICATOR LIGHT BULB CHECK 
    Fig 2: Identifying ABS Warning Light And Brake Indicator Light
    G04949573Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Release the parking brake.
      CAUTION: When releasing the parking brake, set chocks to hold the vehicle for safety.
    2. When the power switch is ON (IG), check that the ABS warning light, brake warning light / red (malfunction), brake warning light / yellow (minor malfunction), slip, brake hold standby, and brake hold operated indicator lights illuminate until the power switch is turned ON (READY).

      If a light remains on, proceed to troubleshooting for the light circuit below.

      TROUBLE AREA REFERENCE

      Trouble area See Procedure
      ABS warning light circuit (light remains on) ABS WARNING LIGHT REMAINS ON 
      ABS warning light circuit (light does not come on) ABS WARNING LIGHT DOES NOT COME ON 
      Brake warning light/ red (malfunction) circuit (light remains on) BRAKE WARNING LIGHT REMAINS ON 
      Brake warning light / red (malfunction) circuit (light does not come on) BRAKE WARNING LIGHT DOES NOT COME ON 
      Brake warning light / yellow (minor malfunction) circuit (light remains on) BRAKE CONTROL WARNING LIGHT REMAINS ON 
      Brake warning light / yellow (minor malfunction) circuit (light does not come on) BRAKE CONTROL WARNING LIGHT DOES NOT COME ON 
      Slip indicator light circuit SLIP INDICATOR LIGHT CIRCUIT 
      Brake hold standby indicator light circuit BRAKE HOLD STANDBY INDICATOR LIGHT CIRCUIT 
      Brake hold operated indicator light circuit BRAKE HOLD OPERATED INDICATOR LIGHT CIRCUIT 
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