Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G32-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
MB-31 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
MB-30 (ACC) - Body ground	-	ACC power supply	Engine switch on (ACC)	11 to 14 V
MB-30 (ACC) - Body ground	-	ACC power supply	Engine switch off	Below 1 V
MB-32 (IG) - Body ground	-	IG power supply	Engine switch on (IG)	11 to 14 V
MB-32 (IG) - Body ground	-	IG power supply	Engine switch off	Below 1 V

(e) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

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(f) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G34-4 (TSW) - Body ground	LG - Body ground	Luggage compartment door opening switch signal	Luggage compartment door opening switch on	Below 1 V
G34-4 (TSW) - Body ground	LG - Body ground	Luggage compartment door opening switch signal	Engine switch off, all doors closed and luggage compartment door opening switch off	Pulse generation
4H-34 (LGCY) - Body ground	LA-GR - Body ground	Luggage compartment door courtesy light switch assembly input signal	Luggage compartment door open	Below 1 V
4H-34 (LGCY) - Body ground	LA-GR - Body ground		Luggage compartment door closed	11 to 14 V
4H-20 (TR+) - Body ground	LA-G - Body ground	Luggage compartment door open relay output signal	Luggage compartment door opening switch on	11 to 14 V
4H-20 (TR+) - Body ground	LA-G - Body ground	Luggage compartment door open relay output signal	Luggage compartment door opening switch off	Below 1 V

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Airbag System(for Gasoline Model): Lost Communication with Front Door Pressure Sensor RH (B166D,B166E)
DESCRIPTION The side collision sensor RH circuit (bus 1) consists of the airbag ECU assembly, side airbag pressure sensor RH and side No. 2 airbag sensor RH. The side airbag pressure sensor RH and side No. 2 airbag sensor RH detect impacts to the vehicle and send signals to the airbag ECU assembly t ...

Toyota Avalon (XX50) 2019-2022 Owners Manual