Inspection Procedure

CHECK: 

Check that the stop light turns ON when the brake pedal is depressed, and turns OFF when the brake pedal is released.

NG: Check stop light system (See  PROBLEM SYMPTOMS TABLE  ). 

OK: Go to Next Step. 

Fig 1: Stop Light Blinking Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK: 

1. See the input signal check in PRE-CHECK .
2. Check the indicator light when the brake pedal is depressed.

OK: 

1. The indicator light goes OFF when the brake pedal is depressed. 

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

NG: Go to Next Step. 

Fig 2: Measuring Voltage Between Terminal STP - Of ECU Connector & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PREPARATION: 

1. Remove the ECU with the connector being.
2. Turn the ignition switch ON.

CHECK: 

Measure the voltage between terminal STP- of the ECU connector and the body ground when the brake pedal is depressed and released.

OK: 

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

NG: Go to Next Step. 

NG: Repair or replace harness or connector. 

OK: Check and replace cruise control ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ) .