RM35X0E _58 Vehicle Interior _078378 THEFT DETERRENT / KEYLESS ENTRY _0388156 THEFT DETERRENT SYSTEM J

THEFT DETERRENT / KEYLESS ENTRY  THEFT DETERRENT SYSTEM  Theft Warning Siren Circuit  


DESCRIPTION

The theft warning siren assembly has an internal battery. If the vehicle battery cable is disconnected or any of the communication lines are open, the theft warning siren assembly detects this and sounds its siren.

Although the theft warning siren assembly usually sounds by receiving a signal from the main body ECU (multiplex network body ECU), the theft warning siren assembly can sound by its internal battery in case the vehicle battery cable is disconnected.

The main body ECU (multiplex network body ECU) sends an arming signal to the theft warning siren assembly while transferring to the armed state, and it also sends a disarming signal to the siren while switching to the disarmed state. Also, the main body ECU (multiplex network body ECU) can cause the theft warning siren assembly to sound by sending an alarm signal during the alarm sounding state.

WIRING DIAGRAM

B427498E41
0.479,0.406 1.323,0.615 0.844,0.208 10 false from Battery 2.26,0.615 3.479,0.823 1.219,0.208 10 false SIREN 3.292,1.688 4.542,2.094 1.25,0.406 10 false Theft Warning Siren Assembly 5.427,1.698 7.094,2.177 1.667,0.479 10 false Main Body ECU (Multiplex Network Body ECU) 3.302,1.531 3.76,1.729 0.458,0.198 10 false V31 5.438,1.521 5.896,1.719 0.458,0.198 10 false N20 4.25,0.76 4.865,0.958 0.615,0.198 10 false CONT 4.729,0.646 5.188,0.844 0.458,0.198 10 false 2 5.323,0.646 5.563,0.844 0.24,0.198 10 false 12 3.208,0.458 3.531,0.667 0.323,0.208 10 false +B 3.208,1.073 3.667,1.271 0.458,0.198 10 false GND 3.021,0.927 3.479,1.125 0.458,0.198 10 false 1 3.031,0.344 3.49,0.542 0.458,0.198 10 false 3 5.563,0.646 6.177,0.844 0.615,0.198 10 false SSCL

CAUTION / NOTICE / HINT

NOTICE:
·

w/ Entry and Start System:

If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

·

If the theft warning siren assembly is replaced, refer to the Service Bulletin.

·

Inspect the fuses for circuits related to this system before performing the following inspection procedure.



PROCEDURE

1.PERFORM ACTIVE TEST USING GTS (SECURITY HORN2)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


e.

According to the display on the GTS, perform the Active Test.

Body Electrical > Main Body > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Security Horn2 Theft warning siren assembly ON or OFF -
Body Electrical > Main Body > Active Test
Tester Display
Security Horn2
50004 123 35
OK:

The theft warning siren assembly sounds and stops correctly when operated through the GTS.



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

2.CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - BATTERY AND BODY GROUND)
2.CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - BATTERY AND BODY GROUND)
a.
B412484C31
1.406,0.313 1.823,0.563 0.417,0.25 1.229,1.948 1.417,1.948 1.417,1.948 1.417,1.385 true 2.063,1.948 1.854,1.948 1.854,1.948 1.854,1.385 true 0.146,0.156 0.458,0.354 0.313,0.198 10 false *a 1.49,0.354 1.802,0.552 0.313,0.198 10 false V31 0.896,1.844 1.333,2.031 0.438,0.188 10 false GND 2.104,1.854 2.542,2.042 0.438,0.188 10 false +B
*a Front view of wire harness connector
(to Theft Warning Siren Assembly)


Disconnect the theft warning siren assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
V31-3 (+B) - Body ground Always 11 to 14 V



c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
V31-1 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])
a.

Disconnect the V31 theft warning siren assembly connector.


b.

Disconnect the N20 main body ECU (multiplex network body ECU) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
V31-2 (CONT) - N20-12 (SSCL) Always Below 1 Ω
V31-2 (CONT) or N20-12 (SSCL) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK THEFT WARNING SIREN ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK THEFT WARNING SIREN ASSEMBLY
a.

Temporarily replace the theft warning siren assembly with a new or normally functioning one.

HINT:

Refer to the Service Bulletin.



b.

Check the operation of the theft warning siren assembly function.

OK:

Theft warning siren assembly function operates normally.



Result:
Proceed to
OK
NG



OK

END (THEFT WARNING SIREN ASSEMBLY WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL