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Diagnosis System

Fig 1: Diagnosis System Chart
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 WARNING LIGHT FUNCTION

      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.
      • This system has a signal check function. The DTC can be read by connecting the intelligent tester 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: Warning Light And Indicator Light Bulb Chart
    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 engine switch is on (IG), check that the ABS warning light, brake warning light / red (malfunction) and brake warning light / yellow (minor malfunction), and slip, brake hold standby, brake hold operated indicator lights illuminate and then turn off after the engine starts.

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

      TROUBLESHOOTING CHART

      Trouble area
      ABS WARNING LIGHT CIRCUIT (LIGHT REMAINS ON) 
      ABS WARNING LIGHT DOES NOT COME ON 
      BRAKE WARNING LIGHT / RED (MALFUNCTION) CIRCUIT (LIGHT REMAINS ON) 
      BRAKE WARNING LIGHT DOES NOT COME ON 
      BRAKE CONTROL WARNING LIGHT REMAINS ON 
      BRAKE CONTROL WARNING LIGHT DOES NOT COME ON 
      SLIP INDICATOR LIGHT CIRCUIT 
      TROUBLESHOOTING CHART

      Trouble area
      BRAKE HOLD STANDBY INDICATOR LIGHT CIRCUIT 
      BRAKE HOLD OPERATED INDICATOR LIGHT CIRCUIT 
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