Diagnosis System

DIAGNOSIS

If the skid control ECU detects a malfunction, the ABS, BRAKE and VSC warning lights and SLIP indicator light 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 ABS, BRAKE And VSC Warning Lights And SLIP Indicator Light

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

LIGHT REFERENCE CHART

Item / Trouble Area	ABS	EBD	(Brake Assist)	TRAC	VSC
ABS Warning Light	◦	◦	◦	-	-
BRAKE Warning Light	-	◦	-	-	-
VSC Warning Light	◦	◦	◦	◦	◦
SLIP Indicator Light	◦	◦	◦	◦	◦

◦: Light ON

-: Light OFF

The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting SST between terminals TC and CG of the DLC3 and observing the blinking pattern of the ABS warning light or multi-information display, by reading the multi-information display, or by connecting the intelligent tester.
This system has a signal check function (see TEST MODE PROCEDURE ).
The DTC can be read by connecting the intelligent tester and observing the blinking pattern of the ABS warning light or by reading the multi-information display.

WARNING LIGHT AND INDICATOR LIGHT CHECK

Release the parking brake.
CAUTION: When releasing the parking brake, set 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.

When the engine switch is turned on (IG), check that the ABS, BRAKE and VSC warning lights, SLIP indicator light and VSC OFF indicator lights illuminate and then turn off after the engine starts.

HINT:

If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS, BRAKE and VSC warning light circuits and SLIP and VSC OFF indicator light circuits. If the indicator remains on, proceed to troubleshooting for the light circuit below.

LIGHT REFERENCE CHART

Trouble area	See procedure
ABS warning light circuit	ABS WARNING LIGHT REMAINS ON
BRAKE warning light	BRAKE WARNING LIGHT REMAINS ON
VSC warning light circuit	VSC WARNING LIGHT REMAINS ON
SLIP indicator light circuit	SLIP INDICATOR LIGHT REMAINS ON
VSC OFF indicator light circuit	SLIP INDICATOR LIGHT REMAINS ON

Fig 2: Identifying ABS, BRAKE And VSC Warning Lights And SLIP Indicator Light