Wireless Door Lock Control System No Answer-Back (Hazard Warning Light And Wireless Door Lock Buzzer)

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

SYSTEM DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WIRELESS DOOR LOCK

CHECK HAZARD WARNING LIGHTS

PERFORM ACTIVE TEST (HAZARD WARNING LIGHT)

CHECK WIRE HARNESS (MULTIPLEX NETWORK BODY ECU - TURN SIGNAL FLASHER RELAY)

PERFORM ACTIVE TEST (WIRELESS DOOR LOCK BUZZER)

CHECK WIRE HARNESS (WIRELESS DOOR LOCK BUZZER - MULTIPLEX NETWORK BODY ECU AND BODY GROUND)

REPLACE WIRELESS DOOR LOCK BUZZER

WIRELESS DOOR LOCK CONTROL SYSTEM - No Answer-Back (Hazard Warning Light and Wireless Door Lock Buzzer)


SYSTEM DESCRIPTION

In some cases, wireless control functions are normal but the hazard warning lights and wireless door lock buzzer are not. Malfunctions may be present in the cowl side junction block ECU's hazard warning light and wireless door lock buzzer signal outputs.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Wireless Door Lock Control System No Answer-Back (Hazard Warning Light And Wireless Door Lock Buzzer)


INSPECTION PROCEDURE

1.CHECK WIRELESS DOOR LOCK

  1. Check that the wireless door lock functions operate with the transmitter.

    Result
    Function
    		Proceed to
    Wireless door lock functions operate normally but hazard warning light answer-back does not occur
    		A
    Wireless door lock functions operate normally but wireless door lock buzzer answer-back does not occur
    		B
    Wireless door lock functions do not operate
    		C


B
Go to step 5

C
GO TO PROBLEM SYMPTOMS TABLE
A


2.CHECK HAZARD WARNING LIGHTS

  1. Check that the hazard warning lights flash continuously when hazard warning switch is pressed.

    OK:
    Hazard warning lights flash continuously.


NG
GO TO LIGHTING SYSTEM
OK


3.PERFORM ACTIVE TEST (HAZARD WARNING LIGHT)

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the hazard warning lights flash.

    Multiplex network body ECU
    Item
    		Test Details
    		Diagnostic Note
    Hazard
    		Turn signal flasher relay ON / OFF
    		-
    OK:
    Hazard warning lights flash.


NG
Go to step 4
OK

REPLACE COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

4.CHECK WIRE HARNESS (MULTIPLEX NETWORK BODY ECU - TURN SIGNAL FLASHER RELAY)
Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Wireless Door Lock Control System No Answer-Back (Hazard Warning Light And Wireless Door Lock Buzzer)

  1. Disconnect the L67 ECU connector.

  1. Disconnect the L25 relay connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    L67-2 (HAZ) - L25-8 (HAZ)
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

5.PERFORM ACTIVE TEST (WIRELESS DOOR LOCK BUZZER)

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the wireless door lock buzzer sounds.

    Multiplex Network Body ECU:

    Item
    		Test Details
    		Diagnostic Note
    Buzzer Resp Sound
    		Wireless door lock buzzer ON / OFF
    		-
    OK:
    Wireless door lock buzzer sounds.


NG
Go to step 6
OK

REPLACE COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

6.CHECK WIRE HARNESS (WIRELESS DOOR LOCK BUZZER - MULTIPLEX NETWORK BODY ECU AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Wireless Door Lock Control System No Answer-Back (Hazard Warning Light And Wireless Door Lock Buzzer)

  1. Disconnect the A18 buzzer connector.

  1. Disconnect the A41 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    A18-1 (B) - A41-2 (BZR)
    		Below 1 Ω
    A18-2 (E) - Body ground
    		Below 1 Ω
    A18-1 (B) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


7.REPLACE WIRELESS DOOR LOCK BUZZER

  1. After replacing the wireless door lock buzzer with a normal one, check that the wireless door lock buzzer sounds by using the transmitter LOCK / UNLOCK switch.

    OK:
    Wireless door lock buzzer sounds.


NG
REPLACE COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)
OK

END