Terminals Of Ecu [09/2015 - 08/2019]

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 on the wire harness side connector according to the value(s) in the chart below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   2C-1 - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V
   2E-1 - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V

   If the result is not as specified, there may be a malfunction in the wire harness.

3. Measure the resistance on the wire harness side connector according to the value(s) in the chart below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   2B-3 - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

   If the result is not as specified, there may be a malfunction in the wire harness.

4. Reconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
5. Measure the voltage and check for pulses according to the value(s) in the chart below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   2C-32 - Body ground	SB - Body ground	Parking lights and front side marker lights drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   2D-30 - Body ground	B - Body ground	Taillights, license plate lights and rear side marker lights drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   2C-31 - Body ground	B - Body ground	Headlight relay drive output	Light control switch in head position	Below 1 V
   			Light control switch not in head position	11 to 14 V
   2C-28 - Body ground	W - 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
   2C-25 - Body ground	B - Body ground	Front fog light drive output	Light control switch in tail or head position, fog light switch in front position	Below 1 V
   			Light control switch in tail or head position, fog light switch off	11 to 14 V
   J8-1 (DIM) - Body ground	L - Body ground	High beam headlight drive output	Dimmer switch in high or high flash position	Below 1 V
   			Dimmer switch in low position	11 to 14 V
   J8-24 (HU) - Body ground	GR - Body ground	Dimmer switch high position signal input	Dimmer switch in high position	Below 1 V
   			Dimmer switch not in high position	Pulse generation
   J8-10 (HF) - Body ground	W - Body ground	Dimmer switch high flash position signal input	Dimmer switch in high flash position	Below 1 V
   			Dimmer switch not in high flash position	Pulse generation
   J8-19 (CLTB) - J8-21 (CLTE)	V - Y	Automatic light control sensor power supply output	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   J8-20 (CLTS) - Body ground	BE - Body ground	Automatic light control sensor signal input	Engine switch off	Below 1 V
   			Automatic light control system operating	Communication waveform generation (See waveform 1)
   J8-3 (RLEW) - Body ground	GR - Body ground	Light control ECU RH signal input	Engine switch on (IG), light control switch off	11 to 14 V
   			Engine switch on (IG), light control switch in head position	Pulse generation
   J8-16 (LLEW) - Body ground	LG - Body ground	Light control ECU LH signal input	Engine switch on (IG), light control switch off	11 to 14 V
   			Engine switch on (IG), light control switch in head position	Pulse generation
   J8-26 (FFOG) - Body ground	SB - Body ground	Fog light switch front position input	Fog light switch in front position	Below 1 V
   			Fog light switch off	Pulse generation
   J8-8 (A) - Body ground	G - Body ground	Light control switch AUTO position signal input	Light control switch in AUTO position	Below 1 V
   			Light control switch not in AUTO position	Pulse generation
   J8-12 (HEAD) - Body ground	Y - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
   			Light control switch not in head position	Pulse generation
   J8-22 (TAIL) - Body ground	V - Body ground	Light control switch tail position signal input	Light control switch in tail or head position	Below 1 V
   			Light control switch not in tail or head position	Pulse generation
   J9-4 (MILE) - Body ground	SB - Body ground	Outside handle foot lights drive output	Outside handle foot light illuminates	11 to 14 V
   			Outside handle foot light off	Below 3 V

   If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

   1. Waveform 1
      Fig 1: Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Tool setting	2 V/DIV., 10 ms./DIV.

      HINT: 

      The communication waveform changes according to the surrounding brightness.

Refer to TERMINALS OF ECU [09/2015 - 08/2016] Refer to TERMINALS OF ECU [08/2016 - 12/2017] Refer to TERMINALS OF ECU [12/2017 - 08/2019]