Diagnosis System

1. Release the parking brake lever.
   NOTE: When releasing the parking brake, set the chocks to hold the vehicle for safety.

   HINT:

   When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.

2. When the ignition switch is turned to the ON position, check that the ABS warning light, BRAKE warning light, VSC warning light, TRAC OFF indicator light and SLIP indicator light remain on for approx. 3 seconds.
   Fig 1: Warning Light Indicator Check

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• If the ECU has any stored DTCs, the ABS warning light, VSC warning light and TRAC OFF indicator light come on.
• If the indicator does not come on, inspect if the bulb is blown out, and also the wire harness between the skid control ECU and the combination meter.
• If the indicator remains on, proceed to troubleshooting for the light circuit below.
  LIGHT CIRCUIT TROUBLESHOOTING
  
  

  Trouble Area	See
  ABS warning light circuit	ABS WARNING LIGHT CIRCUIT (REMAINS ON)  or ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)
  VSC warning light circuit	VSC WARNING LIGHT CIRCUIT (REMAINS ON)  or VSC WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)
  BRAKE warning light circuit	BRAKE WARNING LIGHT CIRCUIT
  TRAC OFF indicator light circuit	TRAC OFF INDICATOR LIGHT, TRAC OFF SWITCH CIRCUIT
  SLIP indicator light circuit	SLIP INDICATOR LIGHT CIRCUIT

• The DTCs are simultaneously stored in memory. The DTCs can be read by connecting the SST between TC and CG terminals of the DLC3 and observing the blinking of the ABS warning light and VSC warning light, or by connecting a hand-held tester.
• This system has a sensor signal check function (TEST MODE).

  The DTC can be read by connecting the SST between terminals TS and CG of the DLC3 and observing the blinking of the ABS warning light and VSC warning light, or by connecting a hand-held tester.