Dynamic Radar Cruise Control System Cruise Main Indicator Light Circuit

Cruise Control System. Lexus Gs430, Gs300. Uzs190 Grs190
Cruise Control. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

READ VALUE OF INTELLIGENT TESTER

DYNAMIC RADAR CRUISE CONTROL SYSTEM - Cruise Main Indicator Light Circuit


DESCRIPTION

When the cruise control main switch is on, the 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 the CAN and BEAN lines.
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 decrease. 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 the CAN and BEAN lines 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.

INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. 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):
    Tester Display
    		Description
    		Check Condition
    Cruise Indic
    		CRUISE main indicator light is ON / OFF
    		ON - OFF

    OK:
    Indicator light comes on.


NG
GO TO COMBINATION METER SYSTEM
OK


2.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG), and turn the intelligent tester main switch ON.

  1. Check the Data List for proper functioning of the CRUISE main indicator light.

    ECM (Cruise control):
    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