Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis System
- DIAGNOSIS
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- If the skid control ECU detects a malfunction, the ABS, BRAKE, VSC TRAC warning lights and the VSC OFF, SLIP, downhill assist control 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.
TROUBLE AREA REFERENCE TABLEItem / Trouble Area ABS EBD BA VSC TRAC A-TRAC Downhill Assist Control Hill-start Assist Control ABS Warning Light ◦ ◦ ◦ - - - - - BRAKE Warning Light - ◦ - - - - - - VSC TARC Warning Light ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ VSC OFF Indicator Light ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ SLIP Indicator Light ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ Downhill Assist Control Indicator Light (A/T) • (Downhill assist control switch ON) • (Downhill assist control switch ON) • (Downhill assist control switch ON) • (Downhill assist control switch ON) • (Downhill assist control switch ON) • (Downhill assist control switch ON) • (Downhill assist control switch ON) • (Downhill assist control switch ON) ◦: Light ON •: Light ON (Blinking) -: Light OFF
- 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 intelligent tester.
- This system has a signal check function (test mode). The DTC can be read by connecting the intelligent tester and observing the blinking of the ABS and VSC TRAC warning lights.
- If the skid control ECU detects a malfunction, the ABS, BRAKE, VSC TRAC warning lights and the VSC OFF, SLIP, downhill assist control indicator lights will come on to warn the driver.
- WARNING LIGHT AND INDICATOR LIGHT CHECK
- 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.
- 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, and downhill assist control 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, and downhill assist control indicator light circuits.
If the indicator remains on, proceed to troubleshooting for the light circuit below.
TROUBLE AREA REFERENCE TABLETrouble Area Information ABS warning light circuit ABS WARNING LIGHT REMAINS ON BRAKE warning light circuit BRAKE WARNING LIGHT REMAINS ON VSC TRAC warning light circuit VSC TRAC WARNING LIGHT REMAINS ON VSC OFF indicator light circuit VSC OFF INDICATOR LIGHT REMAINS ON SLIP indicator light circuit SLIP INDICATOR LIGHT REMAINS ON Downhill assist control indicator light circuit DOWNHILL ASSIST CONTROL INDICATOR LIGHT REMAINS ON
- Release the parking brake lever.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.