Diagnosis System

If the skid control ECU detects a malfunction, the ABS and BRAKE warning lights and the slip, VSC OFF, TRAC OFF, downhill assist control and AUTO LSD indicator lights come on in accordance with the trouble area to warn the driver.

Fig 1: Identifying ABS And Brake Warning Lights And AUTO LSD Indicator Lights

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• The DTCs can be read by connecting SST (09843-18040) between the TC and CG terminals of the DLC3 and observing the blinking pattern of the ABS and slip indicator lights, or by using the Techstream (See DTC CHECK / CLEAR ).
• This system has a sensor signal check function (See TEST MODE PROCEDURE ).

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

   HINT:

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

2. When the ignition switch is turned to ON, check that the ABS and BRAKE warning lights and the slip, VSC OFF, TRAC OFF, downhill assist control and AUTO LSD indicator lights come on and go off in about 3 seconds.

Fig 2: Identifying ABS And Brake Warning Lights And AUTO LSD Indicator Lights

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If the warning lights do not illuminate, check for combination meter and CAN communication system DTCs, since the skid control ECU and combination meter are connected by the CAN communication line.

If the warning light remains on, perform relevant troubleshooting procedures. The relevant troubleshooting procedures are in the sections listed in the table below.