Terminals Of Ecu [11/2018 - ]

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

   Refer to REMOVAL [11/2018 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   Main Body ECU (Multiplex Network Body ECU)

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2. Connect the instrument panel junction block assembly connectors.
3. Measure the voltage and resistance according to the value(s) in the table below.

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

4. Install the main body ECU (multiplex network body ECU).

   Refer to INSTALLATION [11/2018 - ]

5. Measure the voltage and check the waveform between each connector terminal using an oscilloscope according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   G6-20 (CLTS) - Body ground	SB - Body ground	Automatic light control sensor signal input	Power switch off	Below 1 V
   			Power switch on (IG), headlight dimmer switch in AUTO position, material which blocks light used to cover and then uncover top of automatic light control sensor	Communication waveform generation (See waveform 1)
   G6-24 (HU) - Body ground	W - Body ground	Headlight dimmer switch high signal input	Headlight dimmer switch in low position (When vehicle has the dimmer switch off position) Low beams illuminated with headlight dimmer switch in AUTO position (When vehicle does not have the dimmer switch off position)*	11 to 14 V
   			Headlight dimmer switch in high position	Below 1 V
   G6-13 (CANL) - Body ground	W - Body ground	CAN communication line	Power switch on (IG)	Pulse generation
   G6-14 (CANH) - Body ground	BR - Body ground	CAN communication line	Power switch on (IG)	Pulse generation
   G5-23 (AHBI) - Body ground	BE - Body ground	Auto high beam switch signal input	Combination switch assembly (auto high beam switch) on	Below 1 V
   			Combination switch assembly (auto high beam switch) off	11 to 14 V

   *: Low beams do not illuminate in daytime mode. It is necessary to cover the top of the automatic light control sensor with a material which blocks light to activate nighttime mode.

   1. Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Terminal No. (Symbol)	G6-20 (CLTS) - Body ground
      Tool setting	2 V/DIV., 10 ms./DIV.
      Condition	Power switch on (IG), headlight dimmer switch in AUTO position, material which blocks light used to cover and then uncover top of automatic light control sensor

      HINT: 

      The communication waveform changes according to the surrounding brightness.

Refer to TERMINALS OF ECU [11/2018 - ]