RM38N0EC _58 Vehicle Interior _111832 THEFT DETERRENT / KEYLESS ENTRY _0509386 THEFT DETERRENT SYSTEM J

THEFT DETERRENT / KEYLESS ENTRY  THEFT DETERRENT SYSTEM  Power Source Circuit  


DESCRIPTION

Based on changes in the power source voltage, the main body ECU (multiplex network body ECU) can detect if the auxiliary battery has been disconnected and reconnected.

WIRING DIAGRAM

B637465E01
4.156,1.219 5.448,1.396 1.292,0.177 10 false ECU-DCC NO. 2 3.688,1.76 5.083,2.156 1.396,0.396 10 false Power Distribution Box Assembly 3.479,0.896 3.875,1.198 0.396,0.302 10 false 23 5.438,2.104 7.073,2.563 1.635,0.458 10 false Main Body ECU (Multiplex Network Body ECU) 5.438,1.938 5.917,2.115 0.479,0.177 10 false MB 5.396,0.896 5.708,1.094 0.313,0.198 10 false 26 5.646,1 6.26,1.198 0.615,0.198 10 false BECU 0.49,0.99 2.073,1.177 1.583,0.188 10 false from Auxiliary Battery 3.698,1.594 4.063,1.833 0.365,0.24 10 false 4D

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.CHECK HARNESS AND CONNECTOR (POWER SUPPLY)
a.

Disconnect the 4D power distribution box assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
4D-23 - Body ground Ignition switch off*1
Always*2 		8.5 V or higher


*1: for HV Model

*2: for Gasoline Model



Result:
Proceed to
OK
NG



OK

2.INSPECT POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

B637466C01
1.271,0.417 1.719,0.677 0.448,0.26 4.615,0.604 5.063,0.865 0.448,0.26 6.094,2.177 6.313,2.177 6.313,2.177 6.313,1.51 false 0.219,0.146 0.531,0.344 0.313,0.198 10 false *a 1.417,0.479 1.729,0.677 0.313,0.198 10 false 4D 4.74,0.656 5.052,0.854 0.313,0.198 10 false MB 5.677,2.104 6.26,2.385 0.583,0.281 10 false BECU
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
4D-23 - MB-26 (BECU) Always Below 1 Ω



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

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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