Inspection Procedure

Check operation of stop light .
1. Check that the stop light turns ON when the brake pedal is depressed, and turns OFF when the brake pedal is released.
  1. OK: Go to next step.
  2. NG: Check stop light system.
Input signal check .
1. See step ) INPUT SIGNAL CHECK.
2. Check the indicator light when the brake pedal is depressed.
  
  Fig 1: Displaying Indicator Light Blinking Pattern Based On Stop Light Switch Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: The indicator light goes OFF when the brake pedal is depressed .
  1. OK: Proceed to next circuit inspection shown in PROBLEM SYMPTOMS .
  2. NG: Go to next step.
Check voltage between terminal STP- of cruise control ECU connector and body ground .
1. Remove the ECU with the connector being.
2. Turn the ignition switch ON.
  Measure the voltage between terminal STP- of the ECU connector and the body ground when the brake pedal is depressed and released.
  
  Fig 2: Measuring Voltage At STP Terminal Of ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: See Fig 3 .
  
  Fig 3: Identifying Voltage Based On Brake Pedal Condition
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. OK: Proceed to next circuit inspection shown in PROBLEM SYMPTOMS .
  2. NG: Go to next step.
Check for open in harness and connector between terminal STP- of cruise control ECU and stop light switch. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. OK: Check and replace cruise control ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
2. NG: Repair or replace harness or connector.