Entry And Start System Room Oscillator Does Not Recognize Key

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Door Lock. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WIRELESS DOOR LOCK AND UNLOCK OPERATION

CHECK OPERATION OF KEY

PERFORM ACTIVE TEST (INDOOR ELECTRICAL KEY ANTENNA)

CHECK WIRE HARNESS (INDOOR ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)

CHECK INDOOR ELECTRICAL KEY ANTENNA

ENTRY AND START SYSTEM - Room Oscillator does not Recognize Key


DESCRIPTION

If the entry ignition function does not operate, place the key in the vehicle and check if the engine control system starts. If the engine control system starts (the immobiliser code ECU outputs a start permission to the engine control system and the engine control system starts), it can be assumed that only the entry ignition system is malfunctioning.
The certification ECU uses the indoor electrical key antenna to send a request signal to the key when: 1) the driver's door is opened and closed, or 2) the engine switch is turned from on (ACC) to off or off to on. Then, the key transmits its ID code to the entry door control receiver. The ID code, which is then sent to the certification ECU, is verified by the certification ECU and the verification result is sent to the immobiliser code ECU. Turning the engine switch from on (ACC) to off stops the engine control system.
The immobiliser code ECU and the certification ECU communicate encryption codes to each other using the multiplex communication line. When the return code from the certification ECU matches the ID code in memory, the immobiliser code ECU sends an engine control system start permission signal to the ECM. With the brake pedal depressed, pressing the engine switch starts the engine. With the engine running, pressing the engine switch stops the engine.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Entry And Start System Room Oscillator Does Not Recognize Key


INSPECTION PROCEDURE

1.CHECK WIRELESS DOOR LOCK AND UNLOCK OPERATION

  1. Check that the wireless door lock and unlock functions operate normally.

    OK:
    Wireless door lock functions operate normally.


NG
GO TO WIRELESS DOOR LOCK CONTROL FUNCTION
OK


2.CHECK OPERATION OF KEY

  1. After replacing the key with a normally functioning one, check that the wireless lock and unlock functions operate normally.

    OK:
    Wireless lock and unlock functions operate normally.


OK
END (KEY IS DEFECTIVE)
NG


3.PERFORM ACTIVE TEST (INDOOR ELECTRICAL KEY ANTENNA)

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the antenna operates.

    Certification ECU:
    Item
    		Test Details
    		Diagnostic Note
    Fr Transmitter
    		Indoor electrical key antenna (front) ON / OFF
    		-
    Rr Transmitter
    		Indoor electrical key antenna (rear) ON / OFF
    		-
    In Bdr Transmitter
    		Luggage compartment door inner antenna ON / OFF
    		-
    OK:
    When key is brought close to indoor electrical key antenna, antenna is turned OFF and indicator on key illuminates.


OK
REPLACE CERTIFICATION ECU ASSEMBLY
NG


4.CHECK WIRE HARNESS (INDOOR ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)
Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Entry And Start System Room Oscillator Does Not Recognize Key

  1. Disconnect the V35, W31 and W32 antenna connectors.

  1. Disconnect the V28 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    V35-1 (CLG3) - V28-11 (CLG5)*1
    		Below 1 Ω
    V35-1 (CLG3) or V28-11 (CLG5)*1 - Body ground
    		10 kΩ or higher
    W31-1 (CLG4) - V28-13 (CLG6)*1
    		Below 1 Ω
    W31-1 (CLG4) - V28-13 (CLG6)*2 - Body ground
    		10 kΩ or higher
    W32-1 (CLG6) - V28-15 (CLG7)*3
    		Below 1 Ω
    W32-1 (CLG6) or V28-15 (CLG7)*3 - Body ground
    		10 kΩ or higher
    V35-3 (CLGB) - V28-12 (CLG5B)*1
    		Below 1 Ω
    V35-3 (CLGB) or V28-12 (CG5B)*1 - Body ground
    		10 kΩ or higher
    W31-3 (CLGB) - V28-14 (LG6B)*2
    		Below 1 Ω
    W31-3 (CLGB) - V28-14 (CG6B)*2 - Body ground
    		10 kΩ or higher
    W32-3 (CLGB) - V28-16 (CG7B)*3
    		Below 1 Ω
    W32-3 (CLGB) or V28-16 (CG7B)*3 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK INDOOR ELECTRICAL KEY ANTENNA

  1. Carry the key into the vehicle.

  1. Replace the indoor electrical key antenna with a new one.

  1. Depress the brake pedal and check that the engine switch indicator illuminates in green.

    OK:
    Engine switch indicator illuminates in green.


OK
END (INDOOR ELECTRICAL KEY ANTENNA IS DEFECTIVE)
NG

REPLACE CERTIFICATION ECU ASSEMBLY