Cruise Main Indicator Light Circuit: Description

When the cruise control main switch is on, CRUISE main indicator light and RADAR READY indicator come on. This indicates the control condition (presence or absence of a vehicle in front, vehicle-to-vehicle distance, and set vehicle speed) and fail-safe state through the multiplex communication system and CAN communication system. The master warning light and CRUISE main indicator light come on and vehicle-to- vehicle distance information is displayed on the combination meter as the alarm buzzer sounds. Items such as "Clean Radar Sensor", "Cruise not Available", "Check Cruise System" and "Radar Cruise Ready" are displayed in the multi-information display on the combination meter when the ECM detects signals from each sensor and actuator and sends them to the combination meter via CAN and BEAN.

HINT:

If the vehicle in front in the same lane significantly decreases vehicle speed or another vehicle pulls in front of your vehicle, adequate deceleration cannot be applied and the vehicle-to-vehicle distance will shorten. At this time, the system sounds the buzzer and the master warning light blinks to warn the driver. Each indicator in the dynamic radar cruise control uses CAN and BEAN for communication. Therefore if there are any malfunctions in this circuit, check for DTCs in the CAN communication and multiplex communication systems before troubleshooting this circuit.

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
   1. Connect the intelligent tester to the DLC3.
   2. Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check that the combination meter operates.

      Combination meter (Meter ECU): 

      ACTIVE TEST
      
      

      Item	Test Details	Diagnostic Note
      CRUISE INDIC	CRUISE main indicator light is ON / OFF	-

      OK : Indicator light comes on. 

   NG : GO TO COMBINATION METER SYSTEM 

   OK : GO TO NEXT STEP 

2. READ VALUE OF INTELLIGENT TESTER 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG), and turn the intelligent tester main switch on.
   3. Check the DATA LIST for proper functioning of the CRUISE main indicator light.

      ECM (Cruise control): 

      DATA LIST
      
      

      Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
      CCS READY M	Cruise control system standby condition (Main CPU) / ON or OFF	Each time main switch is pushed, ON is displayed and then OFF is displayed	A
      CCS INDICATOR M	Cruise indicator signal (Main CPU) / ON or OFF	ON : "CCS READY" ON OFF : "CCS READY" OFF	B

      OK : When cruise control main switch operation is performed, the result will be same as above. 

      HINT:

      A is OK, but B is NG --> DTC output or ECM failure

   NG : REPLACE ECM 

   OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE