Terminals Of Ecu

HINT:

• Measure the voltage with the connector still connected.
• The whole heater control panel should be replaced if the clock assembly has a malfunction because this part is not independently supplied.
  Fig 1: Identifying Connector Terminals Of ECU

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  CONNECTOR TERMINALS REFERENCE CHART
  
  

  Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
  E3-1 (+B) - Body ground	GR - Body ground	Battery	Always	10 to 14 V
  E3-10 (ACC) - Body ground	L - Body ground	Engine switch signal (Accessory)	Engine switch off	Below 1 V
  			Engine switch on (ACC)	10 to 14 V
  ILL+ (E3-11) - Body ground	G - Body ground	Illumination signal	Engine switch on (IG), light control switch OFF	Below 1 V
  			Engine switch on (IG), light control switch TAIL/HEAD	10 to 14 V
  TX+ (E3-15) - Body ground	GR - Body ground	LIN communication line (Illumination signal)	Engine switch on (IG), cover the automatic light control sensor by hand, and light control switch TAIL/HEAD	Pulse generation
  ILL- (E3-17)- Body ground	BR - Body ground	Illumination signal	Engine switch on (IG)	Pulse generation (See  awaveform)
  E3-18 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 V

1. Waveform (Reference): Using oscilloscope:
   ITEM CONDITION CHART
   
   

   Item	Condition
   Tool setting	2 V/DIV, 1 ms./DIV
   Vehicle condition	Turn the engine switch on (IG), light control switch TAIL/HEAD

   HINT:

   Duty ratio changes as the illumination becomes darker (the period "A" shown in the illustration becomes longer).

   Fig 2: Identifying Signal Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• Measure the voltage with the connector still connected.
• The whole multi-display assembly should be replaced if the clock assembly has a malfunction because this part is not independently supplied.
  Fig 3: Identifying Multi-Display Assembly Connector

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  CONNECTOR TERMINALS REFERENCE CHART
  
  

  Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
  B (E18-1) - Body ground	R - Body ground	Battery	Always	10 to 14 V
  ACC (E18-2) - Body ground	L - Body ground	Engine switch signal (Accessory)	Engine switch off	Below 1 V
  			Engine switch on (ACC)	10 to 14 V
  LIN (E18-4) - Body ground	GR - Body ground	LIN communication line (Illumination signal)	Engine switch on (IG), cover the automatic light control sensor by hand, and light control switch TAIL/HEAD	Pulse generation
  IG+ (E18-5) - Body ground	B - Body ground	Engine switch signal	Engine switch off	Below 1 V
  			Engine switch on (IG)	10 to 14 V
  ILL+ (E18-6) - Body ground	G - Body ground	Illumination signal	Engine switch on (IG), light control switch OFF	Below 1 V
  			Engine switch on (IG), light control switch TAIL/HEAD	10 to 14 V
  ILL- (E18-7) - Body ground	BR - Body ground	Illumination signal	Engine switch on (IG)	Pulse generation (See  awaveform)
  E (E18-8)- Body ground	W-B - Body ground	Ground	Always	Below 1 V

1. Waveform (Reference): Using oscilloscope:
   ITEM CONDITION CHART
   
   

   Item	Condition
   Tool setting	2 V/DIV, 1 ms./DIV
   Vehicle condition	Turn the engine switch on (IG), light control switch TAIL/HEAD

   HINT:

   Duty ratio changes as the illumination becomes darker (the period "A" shown in the illustration becomes longer).

   Fig 4: Identifying Signal Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002