Diagnosis System

If the skid control ECU detects a malfunction, the ABS and/or BRAKE warning lights come on in accordance with the trouble area, to warn the driver.

The table below indicates which lights come on when there are malfunctions in particular functions.

Fig 1: Identifying ABS Warning Light And Brake Warning Light

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 warning light, or by using a Techstream (See DTC CHECK / CLEAR  ).
• This system has a sensor signal check function (See CHECK FOR INTERMITTENT PROBLEMS  ).

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 warning light and brake warning light come on and go off in approximately 3 seconds.

   HINT:

   If the warning lights do not illuminate, confirm whether the bulbs have burned out, and also check for CAN communication system DTCs, since the skid control ECU and combination meter are connected by the CAN communication line.

   Fig 2: Identifying ABS Warning Light And Brake Warning Light

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   TROUBLESHOOTING PROCEDURES
   
   

   Section Title	See
   ABS Warning Light Remains ON	ABS WARNING LIGHT REMAINS ON
   Brake Warning Light Remains ON	BRAKE WARNING LIGHT REMAINS ON