Terminals Of Ecu [04/2020 - 06/2021]

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   4B-1 - Body ground	B - Body ground	Auxiliary battery power supply	Power switch off	11 to 14 V
   4D-1 - Body ground	B-R - Body ground	Auxiliary battery power supply	Power switch off	11 to 14 V
   4F-3 - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

3. Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
4. Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   4A-10 - Body ground	G - Body ground	Back-up lights drive output	Power switch off, reverse (R) not selected	Below 1 V
   			Power switch on (IG), reverse (R) selected	11 to 14 V
   4A-30 - Body ground	L - Body ground	Taillights, rear side marker lights and license plate lights drive output	Taillights on	11 to 14 V
   			Taillight off	Below 1 V
   4B-19 - Body ground	LG - Body ground	BKUP LP relay drive output	Power switch off, reverse (R) not selected	Below 1 V
   			Power switch on (IG), reverse (R) selected	11 to 14 V
   4B-28 - Body ground	P - Body ground	Daytime running light system drive output	Daytime running light system operating	Below 1 V
   			Daytime running light system not operating	11 to 14 V
   4B-31 - Body ground	G - Body ground	H-LP LH relay drive output	Light control switch in head position	Below 1 V
   			Taillight off	11 to 14 V
   4B-32 - Body ground	L - Body ground	Front side marker lights and parking lights drive output	Taillights on	11 to 14 V
   			Taillight off	Below 1 V
   I84-21 (AHID) - Body ground*1	LG - Body ground	Auto high beam switch indicator drive output	Power switch on (IG), auto high beam switch on	Below 1 V
   			Power switch on (IG), auto high beam switch off	11 to 14 V
   I85-12 (HRY2) - Body ground	G - Body ground	H-LP RH relay drive output	Light control switch in head position	Below 1 V
   			Taillight off	11 to 14 V
   I85-13 (DIM) - Body ground	Y - Body ground	High beam headlight drive output	Light control switch in head position and dimmer switch in high or high flash position	Below 1 V
   			Dimmer switch not in high or high flash position	11 to 14 V
   I85-16 (HEAD) - Body ground	L - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
   			Light control switch not in head position	11 to 14 V
   I85-23 (CLTB) - I85-25 (CLTE)*2	R - B	Automatic light control sensor power supply output	Power switch on (IG)	11 to 14 V
   I85-24 (CLTS) - Body ground*2	W - Body ground	Automatic light control sensor signal input	Power switch off	Below 1 V
   			Power switch on (IG)	Pulse generation (See waveform 1)
   I85-26 (AHBI) - Body ground*1	L - Body ground	Auto high beam switch signal input	Auto high beam switch on	Below 1 V
   			Auto high beam switch off	11 to 14 V
   I86-14 (LLEW) - Body ground	L - Body ground	Light control ECU signal input	Power switch on (IG), taillight off	11 to 14 V
   			Power switch on (IG), light control switch in head position	Pulse generation
   I86-15 (RLEW) - Body ground	B - Body ground	Light control ECU signal input	Power switch on (IG), taillight off	11 to 14 V
   			Power switch on (IG), light control switch in head position	Pulse generation
   I86-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

   1. *1: w/ Automatic High Beam System
   2. *2: w/ Automatic Light Control
   1. Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Tester Connection	I85-24 (CLTS) - Body ground
      Tool setting	2 V/DIV., 10 ms./DIV.
      Condition	Power switch on (IG)

      HINT: 

      The communication waveform changes according to the surrounding brightness.

Refer to TERMINALS OF ECU [04/2020 - 06/2021]

Refer to TERMINALS OF ECU [01/2019 - 09/2022]

Refer to TERMINALS OF ECU [04/2020 - 06/2021]

for Nickel Metal Hydride Battery: Refer to TERMINALS OF ECU [01/2019 - 09/2022]

for Lithium-ion Battery: Refer to TERMINALS OF ECU [04/2020 - 09/2022]