RM38T0EC _58 Vehicle Interior _115230 THEFT DETERRENT / KEYLESS ENTRY _0512196 THEFT DETERRENT SYSTEM J

THEFT DETERRENT / KEYLESS ENTRY  THEFT DETERRENT SYSTEM  Horn Circuit  


DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

E480567E01
0.375,1.427 1.25,1.896 0.875,0.469 10 false from Auxiliary Battery 3.042,2.365 3.656,2.563 0.615,0.198 10 false HORN 1.823,1.594 2.438,1.792 0.615,0.198 10 false HORN 6.146,1.344 6.76,1.542 0.615,0.198 10 false HORN 4.531,4.292 5.635,4.677 1.104,0.385 10 false Low Pitched Horn Assembly 4.646,2.26 6.073,2.792 1.427,0.531 10 false Power Distribution Box Assembly 5.458,3.458 7.135,3.99 1.677,0.531 10 false Main Body ECU (Multiplex Network Body ECU) 2.74,1.344 2.958,1.542 0.219,0.198 10 false 1 3.615,1.344 3.833,1.542 0.219,0.198 10 false 2 4.208,4.146 4.427,4.344 0.219,0.198 10 false 1 4.531,4.115 4.885,4.313 0.354,0.198 10 false A2 5.906,1.344 6.26,1.542 0.354,0.198 10 false 23 5.458,3.281 5.813,3.479 0.354,0.198 10 false MB 6.74,1.531 7.094,1.729 0.354,0.198 10 false IC 4.948,1.333 5.302,1.531 0.354,0.198 10 false 11 3.625,1.958 3.844,2.156 0.219,0.198 10 false 5 2.75,1.958 2.969,2.156 0.219,0.198 10 false 3 4.646,2.094 4.958,2.292 0.313,0.198 10 false 8E 2.208,0.719 5.021,0.948 2.813,0.229 10 false to Steering Pad Switch Assembly

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

·

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



PROCEDURE

1.INSPECT HORN
a.

Press the horn switch and check if the horn sounds.

Result:
Result Proceed to
Horn sounds A
Horn does not sound B




A

2.INSPECT POWER DISTRIBUTION BOX ASSEMBLY

B

GO TO HORN SYSTEM

Click hereVehicle Exterior>HORN>HORN SYSTEM>PROBLEM SYMPTOMS TABLE


2.INSPECT POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the main body ECU (multiplex network body ECU).

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL

B591722C02
1.354,0.25 1.771,0.5 0.417,0.25 4.813,0.5 5.229,0.75 0.417,0.25 5.625,1.385 5.896,1.104 true 0.115,0.063 0.427,0.219 0.313,0.156 10 false *a 1.469,0.292 1.781,0.49 0.313,0.198 10 false 8E 4.927,0.531 5.24,0.729 0.313,0.198 10 false MB 5.188,1.323 5.75,1.542 0.563,0.219 10 false HORN
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



b.

Disconnect the 8E power distribution box assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
8E-11 - MB-23 (HORN) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (HORN RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


3.CHECK HARNESS AND CONNECTOR (HORN RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.
B340809C03
0.146,0.125 0.458,0.281 0.313,0.156 10 false *1
*1 No. 1 Engine Room Relay Block


Remove the HORN relay from the No. 1 engine room relay block.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
HORN relay holder terminal 2 - 8E-11 Always Below 1 Ω
HORN relay holder terminal 2 or 8E-11 - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR