Diagnosis System

CHECK DLC3
1. See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS .
CHECK INDICATOR
1. Turn the ignition switch to the ON position.
  
  Fig 1: Identifying Cruise Main Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the CRUISE MAIN indicator light comes on when the cruise control main switch ON-OFF button is pushed on, and that the indicator light goes off when the ON-OFF button is pushed off.
  HINT:
  
  If there is a problem with the ON/OFF illumination of the indicator light, inspect the cruise main indicator light circuit (See CRUISE MAIN INDICATOR LIGHT CIRCUIT ).
  
  HINT:
  
  If a malfunction occurs in the vehicle speed sensor, stop light switch assembly or other related parts during cruise control driving, the ECM actuates AUTO CANCEL of the cruise control. Then the CRUISE MAIN indicator light starts to blink, to inform the driver of the malfunction. At the same time, data of the malfunction is stored as a diagnostic trouble code (DTC).
  
  Fig 2: Cruise Main Indicator Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002