Terminals Of Ecu [11/2023 - ]

NOTE:

Do not remove or install the power distribution box assembly with the negative (-) auxiliary battery terminal connected.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Refer to PRECAUTION [11/2023 - ]
When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
Refer to WORK PROCEDURE [11/2023 - ]

CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the main body ECU (multiplex network body ECU).
Refer to TERMINALS OF ECU [11/2023 - ]
Reconnect the power distribution box assembly connectors.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
MB-13 (GND1) - Body ground	Ground	Always	Below 1 Ω
MB-14 (GND2) - Body ground	Ground	Always	Below 1 Ω
MB-26 (BECU) - Body ground	Auxiliary battery power supply	Always	11 to 14 V
MB-27 (IGR) - Body ground	IG power supply	Ignition switch off	Below 1 V
MB-27 (IGR) - Body ground	IG power supply	Ignition switch ON	11 to 14 V

Install the main body ECU (multiplex network body ECU).
Refer to INSTALLATION [11/2023 - ]

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
8E-5 - Body ground	CXPI communication line	Ignition switch ON	Pulse generation