Toyota Avalon Service & Repair Manual: Power Source Circuit

Toyota Avalon Service & Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System(for Gasoline Model) / Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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 4F instrument panel junction block assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
4F-1 - Body ground	Always	8.5 V or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

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Component without harness connected

(Instrument Panel Junction Block Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4F-1 - MB-31 (BECU)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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Toyota Avalon Service & Repair Manual: Power Source Circuit

Parts Location

Precaution

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