Terminals Of Ecu

1. CHECK COMBINATION METER (METER ECU) 
   CONNECTOR TERMINAL REFERENCE CHART
   
   

   Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   km/h or mph (C10-1) - Body ground	L - Body ground	km/h or mph signal	Power switch ON (ACC or IG) and km/h or mph switch ON	Below 1 V
   			Power switch ON (ACC or IG) and km/h or mph switch OFF	4 to 5.5 V
   TRIP EARTH (C10-2) - Body ground	B - Body ground	GND signal FOR ODO/TRIP SWITCH	Always	Below 1 Ω
   ODO/TRIP/RESET (C10- 3) - Body ground	R - Body ground	ODO/TRIP/RESET signal	ODO/TRIP/RESET switch ON	Below 1 V
   			ODO/TRIP/RESET switch OFF	4 to 5.5 V
   IG2 (C10-4) - Body ground	O - Body ground	Power switch signal	Power switch ON	10 to 14 V
   			Power switch OFF	Below 1 V
   D-BELT SW (C10-6) - Body ground	LG - Body ground	Driver seat belt condition	D-BELT indicator light ON (IG)	Below 1 V
   			D-BELT indicator light OFF	10 to 14 V
   P-BELT SW (C10-7) - Body ground	R - Body ground	Passenger seat belt condition	P-BELT indicator light ON	Below 1 V
   			P-BELT indicator light OFF	10 to 14 V
   SECURITY (C10-8) - Body ground	R - Body ground	SECURITY signal	Key is not inserted	10 to 14 V
   			Key is inserted	Below 1 V
   SPEED IN (C10-9) - Body ground	V - Body ground	Speed signal (Input)	Power switch ON (ACC or IG) and turn the wheel slowly	Pulse generation (see waveform 1)
   AUTO LVL (C10-10) - Body ground	L - Body ground	Headlight automatic leveling signal	Headlight leveling system is normal	Below 1 V
   			Headlight leveling system is malfunctioning	10 to 14 V
   AIRBAG (C10-11) - Body ground	B - Body ground	AIRBAG signal	AIRBAG indicator light ON	Below 1 V
   			AIRBAG indicator light OFF	8 to 14 V
   TEMP SSR- (C10-12) - Body ground	L - Body ground	Outside temperature signal	Always	4 to 5.5 V
   4P OUT (C10-13) - Body ground	V - Body ground	Speed signal (Output)	Power switch ON (ACC or IG) and turn the wheel slowly	Pulse generation (see waveform 2)
   SIGNAL EARTH (C10-14) - Body ground	BR - Body ground	GND signal	Always	Below 1 Ω
   FUEL IN (C10-15) - Body ground	B - Body ground	Fuel signal	Power switch ON (ACC or IG) and fuel level is FULL	4.0 Ω
   			Power switch ON (ACC or IG) and fuel level is EMPTY	110 Ω
   TURN R (C10-18) - Body ground	G - Body ground	Turn signal right	Turn signal RH indicator light OFF	Below 1 V
   			Turn signal RH indicator light ON	10 to 14 V
   TURN L (C10-19) - Body ground	Y - Body ground	Turn signal left	Turn signal LH indicator light OFF	Below 1 V
   			Turn signal LH indicator light ON	10 to 14 V
   TEMP SSR+ (C10-20) - Body ground	R - Body ground	GND	Always	Below 1 Ω
   +B (C10-21) - Body ground	Y - Body ground	Power switch signal	Always	10 to 14 V
   IG2 (C10-22) - Body ground	V - Body ground	Power switch signal	Power switch ON (IG)	10 to 14 V
   			Power switch OFF	Below 1 V
   BACK-UP LP (C10-23) - Body ground	P - Body ground	Back-up light signal	Power switch ON (ACC or IG) and shift is except R position	Below 1 V
   			Power switch ON (ACC or IG) and shift is R position	10 to 14 V
   CHECK E/G (C10-26) - Body ground	G - Body ground	MIL signal	Power switch ON (ACC or IG) and MIL on	Below 1 V
   			Power switch ON (ACC or IG) and MIL off	10 to 14 V
   TC (C10-28) - Body ground	SB - Body ground	Tail cancel (light condition) signal	Power switch ON (ACC or IG)	Pulse generation (see waveform 3)
   TR (C10-29) - Body ground	R - Body ground	Rheostat (light control) signal	Light control dimmer switch is OFF	Below 1 V
   			Light control dimmer switch is TAIL / HEAD	10 to 14 V
   P-BELT LP (C10-30) - Body ground	Y - Body ground	Passenger seat belt signal	Power switch ON (ACC or IG) and sit on passenger seat, seat belt unfastened	Below 1 V
   			Power switch ON (ACC or IG) and sit on passenger seat, seat belt fastened	10 to 14 V
   FUEL EARTH (C10-31) - Body ground	BR - Body ground	GND for fuel sender gauge	Always	Below 1 V

   Fig 1: Identifying Terminals Of ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Using an oscilloscope, check the signal waveform 1 of the meter.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE 1
      
      

      Item	Contents
      Symbols (Terminal No.)	SPEED IN (C10-9) - Body ground
      Tool setting	5 V/DIV., 20 msec./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12 mph)

      HINT:

      As vehicle speed increases, the wavelength shortens.

      Fig 2: Identifying Waveform 1 Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Using an oscilloscope, check the signal waveform 2 of the meter.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE 2
      
      

      Item	Contents
      Symbols (Terminal No.)	4P OUT (C10-13) - Body ground
      Tool setting	5 V/DIV., 10 msec./DIV.
      Vehicle condition	Engine idle speed

      HINT:

      As vehicle speed increases, the wavelength shortens.

      Fig 3: Identifying Waveform 2 Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Using an oscilloscope, check the signal waveform 3 of the meter.

      Waveform 3 (Reference) 

      WAVEFORM REFERENCE 3
      
      

      Item	Contents
      Symbols (Terminal No.)	TC (C10-28) - Body ground
      Tool setting	2 V/DIV., 1 msec./DIV.
      Vehicle condition	Power switch ON (IG)

      HINT:

      Waveform changes as illumination dims ("A" becomes longer).

      Fig 4: Identifying Waveform 3 Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. CHECK SUB WIRE HARNESS CONNECTOR 
   Fig 5: Identifying Wire Harness Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 6: Identifying Connector Terminal

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

   Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   SECURITY (A-1) - Body ground	R - Body ground	SECURITY signal	Key is inserted	Below 1 V
   			Key is not inserted	10 to 14 V
   D-BELT SW (A-3) - Body ground	LG - Body ground	Driver seat belt condition	D-BELT indicator light ON	Below 1 V
   			D-BELT indicator light OFF	10 to 14 V
   SIGNAL EARTH (A-4) - Body ground	BR - Body ground	GND signal	Always	Below 1 Ω
   TRIP EARTH (A-5) - Body ground	B - Body ground	GND signal FOR ODO/TRIP SWITCH
   km/h or mph (A-6) - Body ground	L - Body ground	km/h or mph signal	Power switch ON (ACC or IG) and km/h or mph switch ON	Below 1 V
   			Power switch ON (ACC or IG) and km/h or mph switch OFF	4 to 5.5 V
   IG2 (A-7) - Body ground	O - Body ground	Power switch signal	Power switch ON (IG)	10 to 14 V
   			Power switch OFF	Below 1 V
   ODO/TRIP/RESET (A-8) - Body ground	R - Body ground	ODO/TRIP/RESET signal	ODO/TRIP/RESET switch ON	Below 1 V
   			ODO/TRIP/RESET switch OFF	4 to 5.5 V
   SPEED IN (A-9) - Body ground	V - Body ground	Speed signal (Input)	Power switch ON (ACC or IG) and turn the wheel slowly	Pulse generation (see waveform 1)
   CHECK E/G (A-10) - Body ground	G - Body ground	MIL signal	Power switch ON (ACC or IG) and MIL ON	Below 1 V
   			Power switch ON (ACC or IG) and MIL OFF	10 to 14 V
   TURN L (A-11) - Body ground	Y - Body ground	Turn signal left	Turn signal LH indicator light OFF	Below 1 V
   			Turn signal LH indicator light ON	10 to 14 V
   TURN R (A-12) - Body ground	G - Body ground	Turn signal right	Turn signal RH indicator light ON	Below 1 V
   			Turn signal RH indicator light OFF	10 to 14 V
   BACK-UP LP (A-13) - Body ground	P - Body ground	BACK-UP light signal	Power switch ON (ACC or IG) and shift is except R position	Below 1 V
   			Power switch ON (ACC or IG) and shift is R position	10 to 14 V
   AIRBAG (A-14) - Body ground	B - Body ground	AIRBAG signal	AIRBAG indicator light ON	Below 1 V
   			AIRBAG indicator light OFF	8 to 14 V
   TR (B-2) - Body ground	R - Body ground	Rheostat (light control) signal	Light control dimmer switch is TAIL / HEAD	Below 1 V
   			Light control dimmer switch is OFF	10 to 14 V
   P-BELT SW (B-4) - Body ground	R - Body ground	Passenger seat belt condition	P-BELT indicator light ON	Below 1 V
   			P-BELT indicator light OFF	10 to 14 V
   AUTO LVL (B-5) - Body ground	L - Body ground	Headlight automatic leveling signal	Headlight leveling system is normal	Below 1 V
   			Headlight leveling system is malfunctioning	10 to 14 V
   TEMP SSR+ (B-8) - Body ground	R - Body ground	GND	Always	Below 1 Ω
   +B (B-9) - Body ground	Y - Body ground	Power switch signal	Always	10 to 14 V
   TEMP SSR- (B-10) - Body ground	L - Body ground	Outside temperature signal		4 to 5.5 V
   IG2 (B-11) - Body ground	V - Body ground	Power switch signal	Power switch ON (IG)	10 to 14 V
   			Power switch OFF	Below 1 V
   FUEL IN (B-12) - Body ground	B - Body ground	Fuel signal	Power switch ON (ACC or IG) and fuel level is FULL	4.0 Ω
   			Power switch ON (ACC or IG) and fuel level is EMPTY	110 Ω
   FUEL EARTH (B-13) - Body ground	BR - Body ground	GND for fuel sender gauge	Always	Below 1 Ω
   4P OUT (B-14) - Body ground	V - Body ground	Tachometer signal (Output)	Power switch ON (ACC or IG) and turn the wheel slowly	Pulse generation (see waveform 2)
   TC (B-15) - Body ground	SB - Body ground	Taillight cancel (light condition) signal	Power switch ON (ACC or IG)	Pulse generation (see waveform 3)

   1. Using an oscilloscope, check the signal waveform 1 of the meter.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE 1
      
      

      Item	Contents
      Symbol (Terminal No.)	SPEED IN (A-9) - Body ground
      Tool setting	5 V/DIV., 20 msec./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12 mph)

      HINT:

      As vehicle speed increases, the wavelength shortens.

      Fig 7: Identifying Waveform 1 Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Using an oscilloscope, check the signal waveform 2 of the meter.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE 2
      
      

      Item	Contents
      Symbol (Terminal No.)	4P OUT (B-14) - Body ground
      Tool setting	5 V/DIV., 10 msec./DIV.
      Vehicle condition	Engine idle speed

      HINT:

      As vehicle speed increases, the wavelength shortens.

      Fig 8: Identifying Waveform 2 Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Using an oscilloscope, check the signal waveform 3 of the meter.

      Waveform 3 (Reference) 

      WAVEFORM REFERENCE 3
      
      

      Item	Contents
      Symbol (Terminal No.)	TC (B-15) - Body ground
      Tool setting	2 V/DIV., 1 msec./DIV.
      Vehicle condition	Power switch ON (IG)

      HINT:

      Waveform changes as illumination dims ("A" becomes longer).

      Fig 9: Identifying Waveform 3 Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. COMBINATION METER INNER CIRCUIT 
   Fig 10: Combination Meter Inner Circuit - Wiring Diagram (1 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 11: Combination Meter Inner Circuit - Wiring Diagram (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Table of Terminal Connection