Diagnosis System

1. If the skid control ECU detects a malfunction, the ABS, brake, VSC TRAC warning lights and the VSC OFF, slip, DAC indicator lights will come on to warn the driver. The table below indicates which lights will come on when there is a malfunction in a particular function.
   Fig 1: Identifying Warning Lights Of ABS And BRAKE

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 2: Lights ON OFF Description Table

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting the SST between terminals TC and CG of the DLC3 and observing the blinking of the ABS and VSC TRAC warning lights, or by connecting the hand-held tester.
   • This system has a signal check function (test mode).

     The DTC can be read by connecting the hand-held tester and observing the blinking of the ABS and VSC TRAC warning lights.

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, brake, and VSC TRAC warning lights and the VSC OFF, slip, AUTO LSD, and DAC indicator lights come on for approximately 3 seconds.

HINT:

If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS, brake, and VSC TRAC warning light circuits, and the VSC OFF, slip, AUTO LSD, and DAC indicator light circuits.

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

Fig 3: Identifying Warning Lights Of ABS And BRAKE

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002