Terminals Of Ecu [06/2018 - ]

Fig 1: Main Body ECU (Multiplex Network Body ECU) And Instrument Panel Junction Block Assembly Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

   HINT: 

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   G36-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

3. Reconnect the instrument panel junction block assembly connectors.
4. 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
   			Engine switch off	Below 1 V
   MB-32 (IG) - Body ground	-	IG power supply	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V

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

   Refer to INSTALLATION [06/2018 - ]

6. 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
   G38-4 (TSW) - Body ground	LG - Body ground	Luggage compartment door opening switch signal	Luggage compartment door opening switch on	Below 1 V
   			Engine switch off, all doors closed and luggage compartment door opening switch off	Pulse generation
   G37-27 (TMSW) - Body ground	B - Body ground	Luggage door opening cancel switch signal	Luggage door opening cancel switch on	Below 1 V
   			Engine switch off, all doors closed and luggage door opening cancel switch off	Pulse generation
   3H-34 (LGCY) - Body ground	GR - Body ground	Luggage compartment door courtesy light switch assembly input signal	Luggage compartment door open	Below 1 V
   			Luggage compartment door closed	11 to 14 V
   3H-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
   			Luggage compartment door opening switch off	Below 1 V

Refer to TERMINALS OF ECU [06/2018 - 08/2021] , or refer to TERMINALS OF ECU [08/2021 - ]