Terminals Of Ecu

Fig 1: Identifying Combination Meter Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D1 combination meter assembly connector.
2. Measure the voltage and resistance of the wire harness side connector.

   Standard: 

   ECU TERMINAL REFERENCE
   
   

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   D1-1 (IG2) - Body ground	B - Body ground	Ignition switch signal	Ignition switch OFF → ON	Below 1 V → 11 to 14 V
   D1-2 (ECUB) - Body ground	L - Body ground	Battery	Always	11 to 14 V
   D1-24 (ET) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω

   HINT:

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

3. Disconnect the D76 combination meter assembly connector.
4. Measure the voltage of the wire harness side connector.

   Standard voltage: 

   ECU TERMINAL REFERENCE
   
   

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   D1-3 (FUEL) - Body ground	V - Body ground	Fuel level signal	Ignition switch ON	11 to 14 V
   D1-6 (TIRE)*7 - Body ground	O - Body ground	Tire pressure warning signal	Ignition switch ON, Tire pressure warning light ON	0.9 to 3.2 V
   			Ignition switch ON, Tire pressure warning light OFF	3.2 V or higher
   D1-7 (ILL-) - Body ground	GR - Body ground	Light control rheostat signal	Ignition switch OFF → ON	Pulse generation (see  1waveform 1)
   D1-14 (ILL+) - Body ground	G - Body ground	Illumination signal	Light control switch OFF → ON	Below 1 V → 11 to 14 V
   D1-15 (TC) - Body ground	Y - Body ground	Tail cancel switch signal	Tail cancel switch OFF → ON	Below 1 V → 11 to 14 V
   D1-16 (+S) - Body ground	SB - Body ground	Vehicle speed signal (Output)	Driving at approx. 12 mph (20 km/h)	Pulse generation (see  2waveform 2)
   D1-17 (SI) -Body ground	P - Body ground	Vehicle Speed signal (Input)	Driving at approx. 12 mph (20 km/h)	Pulse generation (see  2waveform 2)
   D1-20 (CANH) - Body ground	G - Body ground	CAN communication line	Ignition switch ON	Pulse generation
   D1-21 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
   D76-1 (CHG-) - Body ground	SB *3 or L *4 - Body ground	Charge warning light signal	Ignition switch ON Engine start Charge warning light OFF → ON	11 to 14 V → Below 1 V
   D76-2 (SW) - Body ground	V - Body ground	Brake fluid level warning light signal	Ignition switch ON Brake fluid level warning light ON → OFF	Below 1V → 11 to 14 V
   D76-4 (EFI) - Body ground	B - Body ground	MIL signal	Ignition switch ON MIL ON → OFF	Below 1 V → 11 to 14 V
   D76-7 (FOG)*5 - Body ground	R - Body ground	Front FOG signal	Ignition switch ON Front fog light switch OFF → ON	Below 1V → 11 to 14 V
   D76-8 (B) - Body ground	LG - Body ground	Turn signal LH signal	Ignition switch ON Turn signal LH indicator light OFF → ON → OFF	Below 1 V → 11 to 14 V → Below 1 V
   D76-9 (PBLT) - Body ground	O - Body ground	Seat belt warning light signal (Passenger side)	Ignition switch ON Front passenger seat belt warning light OFF → ON → OFF	Below 1 V → 11 to 14 V → Below 1 V
   D76-10 (WLVL)*6-Body ground	W - Body ground	Washer level warning signal	Ignition switch ON Washer level warning light ON → OFF	Below 1 V → 11 to 14 V
   D76-11 (BEAM-) - Body ground	P - Body ground	HI-BEAM indicator signal (-)	Headlight dimmer switch (Hi-BEAM) Hi → Lo	Below 1 V → 11 to 14 V
   D76-12 (S) - Body ground	Y - Body ground	Oil pressure signal	OIL / P warning light ON → OFF	Below 1 V → 11 to 14 V
   D76-13 (HEAD)*1 -Body ground	L - Body ground	HEAD light indicator signal	Light control switch OFF → ON	Below 1 V → 11 to 14 V
   D76-14 (BEAM+) - Body ground	GR - Body ground	HI-BEAM indicator signal (+)	BEAM indicator light OFF → ON	Below 1 V → 11 to 14 V
   D76-15 (B) - Body ground	BR - Body ground	Turn signal RH signal	Turn signal RH indicator light OFF → ON → OFF	Below 1 V → 11 to 14 V → Below 1 V
   D76-16 (IND)*2-Body ground	G - Body ground	Taillight indicator signal	Light control switch OFF → ON	Below 1 V → 11 to 14 V
   D76-17 (ODO) - Body ground	L - Body ground	ODO/TRIP switch signal	Ignition switch ON	5V
   D76-18 (CLK) - Body ground	R - Body ground	Clock switch signal	Ignition switch ACC	5V
   D76-19 (E1) - Body ground	GR - Body ground	Ground	Ignition switch ON	Below 1 V
   D76-20 (RLCY) - Body ground	G - Body ground	Rear door courtesy switch signal (LH)	Rear door (LH) CLOSED → OPEN	11 to 14 V → Below 1 V
   D76-21 (RRCY) - Body ground	L - Body ground	Rear door courtesy switch signal (RH)	Rear door (RH) CLOSED → OPEN	11 to 14 V → Below 1 V
   D76-22 (JB ECU) - Body ground	Y - Body ground	Rear door courtesy switch signal (LH or RH)	Rear door (LH or RH) CLOSED → OPEN	11 to 14 V → Below 1 V
   HINT: If the result is not as specified, the combination meter assembly may be malfunctioning *1: for U.S.A. only *2: for Canada only *3: Vehicles with Daytime running lights *4: Vehicles without Daytime running lights *5: Vehicles with Front fog lights *6: Vehicles with Washer level warning lights *7: Vehicles with Tire Pressure Warning System

   1. Waveform 1: Using an oscilloscope
      WAVEFORM REFERENCE 1
      
      

      Terminal Connections	D1-7 (ILL-) - Body Ground
      Tool Setting	5V / DIV, 50 ms / DIV
      Condition	Ignition switch ON

      Fig 2: Waveform Graph 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Waveform 2: Using an oscilloscope
      WAVEFORM REFERENCE 2
      
      

      Terminal Connections	D1-16 (+S) - Body Ground D1-17 (SI) -Body Ground
      Tool Setting	5V / DIV, 20ms / DIV
      Condition	Driving at approximately 12mph (20km/h)

      Fig 3: Waveform Graph 2

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      As the vehicle speed increases, the cycle of the signal waveform narrows.

Fig 4: Identifying Main Body ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

Fig 5: Identifying Main Body ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

Fig 6: Combination Meter Internal Circuit Diagram (1 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 7: Combination Meter Internal Circuit Diagram (2 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 8: Combination Meter Internal Circuit Diagram (3 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connectors