Theft Deterrent System Theft Warning Siren Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (THEFT WARNING SIREN)

CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - BATTERY AND BODY GROUND)

CHECK MAIN BODY ECU (OUTPUT SIGNAL)

CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - MAIN BODY ECU)

THEFT DETERRENT SYSTEM - Theft Warning Siren Circuit


DESCRIPTION

  1. The theft warning siren assembly (self power siren) has an internal battery. If the vehicle battery cable is disconnected or any of the communication lines are open, the theft warning siren assembly (self power siren) detects this and sounds its siren.
  2. Although the theft warning siren assembly (self power siren) usually sounds by receiving a signal from the main body ECU, the theft warning siren assembly (self power siren) can sound by its internal battery in case the vehicle battery cable is disconnected.
  3. The main body ECU sends an arming signal to the theft warning siren assembly (self power siren) while switching to the armed state, and it sends a disarming signal to the siren while switching to the disarmed state. Also, the main body ECU can cause the theft warning siren assembly (self power siren) to sound by sending an alarm signal during the alarm sounding state.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function).Theft Deterrent System Theft Warning Siren Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (THEFT WARNING SIREN)

  1. Operate the intelligent tester according to the steps on the display and select Active Test (LandCruiser RM000000W0S036X.html).

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Security Horn2
    		Theft warning siren (self power siren)
    		ON/OFF
    		-
    OK:
    Siren operates normally.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000002TGC02DX.html)

2.CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - BATTERY AND BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function).Theft Deterrent System Theft Warning Siren Circuit

  1. Disconnect the Q33 siren connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Q33-2 (GND) - Body ground
    		Always
    		Below 1 Ω

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Q33-5 (+B) - Body ground
    		Always
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Theft Warning Siren Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK MAIN BODY ECU (OUTPUT SIGNAL)


  1. Using an oscilloscope, check waveform 1.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function).Theft Deterrent System Theft Warning Siren Circuit


    Text in Illustration
    *a
    		Component with harness connected
    (Main Body ECU)
    		*b
    		Waveform 1
    *c
    		Waveform 2
    		-
    		-
    Measurement Condition
    Item
    		Content
    Tester Connection
    		G63-18 (SSCL) - Body ground
    Tool Setting
    		2 V/DIV., 20 ms./DIV.
    Condition
    		Switched from armed state or arming preparation state to disarmed state

  1. Using an oscilloscope, check waveform 2.

    Measurement Condition
    Item
    		Content
    Tester Connection
    		G63-18 (SSCL) - Body ground
    Tool Setting
    		2 V/DIV., 20 ms./DIV.
    Condition
    		Switched from arming preparation state to armed state
OK:
Waveform is output normally (refer to illustration).


NG
Go to step 4
OK

REPLACE THEFT WARNING SIREN ASSEMBLY (SELF POWER SIREN) (LandCruiser RM000002PLO043X.html)

4.CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - MAIN BODY ECU)

  1. Disconnect the Q33 siren connector.

  1. Disconnect the G63 ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Q33-4 (CONT) - G63-18 (SSCL)
    		Always
    		Below 1 Ω
    Q33-4 (CONT) or G63-18 (SSCL) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)