THEFT DETERRENT SYSTEM > Theft Warning Siren Circuit

for Preparation Click here


DESCRIPTION

The theft warning siren sounds if either of the following condition is met:
  1. The theft deterrent system is in the alarm sounding state.
  2. The theft warning siren is in the armed state when +B, GND or the communication line is open.

WIRING DIAGRAM


B220571E11


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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch to on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Main Body / Active Test.

  1. Perform the Active Test according to the display on the intelligent tester.

    Main Body (Main Body ECU (Multiplex Network Body ECU)) 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Security Horn2
    		Theft warning siren
    		ON / OFF
    		-

    OK:
    The theft warning siren assembly sounds and stops correctly when operated using the intelligent tester.



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.CHECK THEFT WARNING SIREN ASSEMBLY


    B272423E01

  1. Remove the theft warning siren assembly with harness connected (Click here).

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Q24-5 (+B) - Body ground
    		Power switch off
    		11 to 14 V
    Q24-2 (GND) - Body ground
    		Always
    		Below 1 V
    Q24-4 (CONT) - Body ground
    		When switched from armed state or arming preparation state to disarmed state (1) or disarmed state (2) (*1)
    		Wave pattern (1) shown in chart below
    When switched from arming preparation state to armed state (*2)
    		Wave pattern (2) shown in chart below
    Normal condition (Except (*1) and (*2))
    		11 to 14 V

    Text in Illustration 
    *a
    		Component with harness connected
    (Theft Warning Siren Assembly)



  1. Wave pattern


    B110513E05



NG
REPLACE THEFT WARNING SIREN ASSEMBLY (Click here)
OK


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

  1. Disconnect the H17 main body ECU (multiplex network body ECU) connector.

  1. Disconnect the Q24 theft warning siren assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H17-18 (SSCL) - Q24-4 (CONT)
    		Always
    		Below 1 Ω
    H17-18 (SSCL) - Body ground
    		Always
    		10 kΩ or higher
    Q24-2 (GND) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)