Inspection Procedure

Check operation of stop light switch.
CHECK:

Check that the stop lights turn on when the brake pedal is depressed and turn off when the brake pedal is released.
1. OK: Go to step 4.
2. NG: Go To Next Step
Measure voltage between terminal STP of skid control ECU and body ground.
PREPARATION:

Disconnect the brake actuator connector.

CHECK:

Measure the voltage between terminal STP of the skid control ECU and body ground when the brake pedal is depressed.

OK:

Voltage: 8 to 14 V

CHECK:

Measure the voltage between terminal STP of the skid control ECU and body ground when the brake pedal is released.

OK:

Voltage: Below 1 V

Fig 1: Identifying Terminals STP Of Skid Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 3
2. OK: If same code is still output after DTC is deleted, check contact condition of each connection. If connections are normal, ECU may be defective.
NOTE: When replacing the brake actuator assembly, perform the zero point calibration (see PRE-CHECK ).
Check stop light circuit (See PROBLEM SYMPTOMS TABLE )
1. NG: Repair or replace stop light circuit.
2. OK: Go To Next Step
Check for open circuit in harness and connector between skid control ECU and stop light switch (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or replace harness and connector.
2. OK: Replace brake actuator assembly.
NOTE: When replacing the brake actuator assembly, perform the zero point calibration (see PRE-CHECK ).