Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Check operation of stop light.
Check: that the stop light lights up when the brake pedal is depressed and turns off when the brake pedal is released.

NG: Repair stop light circuit. See steps 1-3 INSPECTION .

If OK , go to step 2.
Check voltage between terminal STP (48) of ABS & BA & TRAC & VSC ECU and body ground.
Preparation: Disconnect the connector from the ABS & BA & TRAC & VSC ECU.

Check: Measure the voltage between terminal 48 of ABS & BA & TRAC & VSC ECU harness side connector and body ground when the brake pedal is depressed.

Fig 1: Testing Terminal 48 Voltage ABS & BA & TRAC & VSC ECU To Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Voltage: 7.5-14 V.

OK: Check and replace ABS & BA & TRAC & VSC ECU.

If NG , go to step 3.
Check for open circuit in harness and connector between terminal STP of ABS & BA & TRAC & VSC ECU and stop light switch. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .

NG: Repair or replace harness or connector.

OK: Proceed to next circuit inspection shown in problem symptoms table. See PROBLEM SYMPTOMS TABLE .