Terminals Of Ecu

1. CHECK COMBINATION METER ASSEMBLY 
   Fig 1: Check Combination Meter ECU Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the C10 and C11 meter connectors.
   2. Measure the voltage and resistance of the wire harness side connectors.
      WIRING COLOR TERMINAL DESCRIPTION
      
      

      Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
      IGN1 (C10-1) - Body ground	R-B - Body ground	Ignition switch signal	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
      S GND (C10-3) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
      +B (C10-7) - Body ground	L-B - Body ground	Battery	Always	10 to 14 V
      IGN2 (C11-13) - Body ground	B-R - Body ground	Ignition switch signal	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V

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

   3. Reconnect the C10 and C11 meter connectors.
   4. Measure the resistance of the connectors.
      WIRING COLOR TERMINAL DESCRIPTION
      
      

      Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
      BEAM- (C10-2) - Body ground	R-Y - Body ground	Hi-beam indicator signal	Headlight dimmer switch (Hi-beam) Lo --> Hi	Below 1 V --> 10 to 14 V
      TURN R (C10-4) - Body ground	G-Y - Body ground	Turn signal RH indicator signal	Ignition switch ON, turn signal RH indicator OFF --> ON	Below 1 V --> 10 to 14 V
      TURN L (C10-5) - Body ground	P-B - Body ground	Turn signal LH indicator signal	Ignition switch ON, turn signal LH indicator OFF --> ON	Below 1 V --> 10 to 14 V
      P-BELT OUT (C10-6) - Body ground	G-W - Body ground	Seat belt warning light signal (Passenger's seat)	Seat belt warning light for passenger's seat OFF --> Blinks	Below 1 V --> 10 to 14 V
      BEAM+ (C10-8) - Body ground	R-L - Body ground	Hi-beam indicator signal	Headlight dimmer switch (Hi-beam) Lo --> Hi	Below 1 V --> 10 to 14 V
      KEY ILL OUT (C10-9) - Body ground	BR-Y - Body ground	Key illumination signal	Key illumination ON --> OFF	Below 1 V --> 10 to 14 V
      SP (C10-10) - Body ground	W-R - Body ground	Vehicle speed signal (Input)	Ignition switch ON, slowly turn wheel	Pulse generation (See WAVEFORM 1 )
      TM (C10-11) - Body ground	B - Body ground	Tachometer signal (Input)	Engine idling	Pulse generation (See WAVEFORM 2 )
      ILL+ (C10-12) - Body ground	G - Body ground	Illumination signal	Taillight OFF --> ON	Below 1 V --> 10 to 14 V
      2 (C11-1) - Body ground(1)	G - Body ground	A/T shift indicator signal (2)	A/T 2 indicator OFF --> ON	Below 1 V --> 10 to 14 V
      D (C11-2) - Body ground(1)	LG-B - Body ground	A/T shift indicator signal (D)	A/T D indicator OFF --> ON	Below 1 V --> 10 to 14 V
      N (C11-3) - Body ground(1)	GR - Body ground	A/T shift indicator signal (N)	A/T N indicator OFF --> ON	Below 1 V --> 10 to 14 V
      R (C11-4) - Body ground(1)	R-W - Body ground	A/T shift indicator signal (R)	A/T R indicator OFF --> ON	Below 1 V --> 10 to 14 V
      P (C11-5) - Body ground(1)	R - Body ground	A/T shift indicator signal (P)	A/T P indicator OFF --> ON	Below 1 V --> 10 to 14 V
      D-BELT (C11-6) - Body ground	W-R - Body ground	Seat belt warning light for driver's seat signal	Ignition switch ON, seat belt unfastened --> fastened	Below 1 V --> 10 to 14 V
      ILL- (C11-7) - Body ground	W-R - Body ground	Illumination signal	Light control switch TAIL, light control rheostat position MIN --> MAX	Below 1 V --> 10 to 14 V
      P-BELT (C11-8) - Body ground	O - Body ground	Seat belt warning light for passenger's seat signal	Ignition switch ON, sit on passenger seat, seat belt unfastened --> fastened	Below 1 V --> 10 to 14 V
      VSC (C11-10)(2) - Body ground	BR-W - Body ground	VSC warning light signal	Ignition switch ON, VSC warning light ON --> OFF	Below 1 V --> 10 to 14 V
      ABS (C11-11) - Body ground	P - Body ground	ABS signal	Ignition switch ON, ABS warning light ON --> OFF	6.7 to 12 V --> Below 1 V
      O/D OFF (C11-12) - Body ground	G-O - Body ground	O/D OFF signal	O/D OFF indicator light ON --> OFF	Below 1 V --> 10 to 14 V
      BRAKE (C11-14) - Body ground	B-Y - Body ground	Brake signal	Ignition switch ON, BRAKE warning light ON --> OFF	6.7 to 12 V --> Below 1 V
      BRAKE LEVEL (C11-15) - Body ground	Y-R - Body ground	Brake fluid level warning light signal	Ignition switch ON, brake fluid level warning light ON --> OFF	Below 1 V --> 10 to 14 V
      OIL-P (C11-16) - Body ground	G-Y - Body ground	Oil pressure signal	Oil pressure warning light ON --> OFF	Below 1 V --> 10 to 14 V
      L (C11-17) - Body ground(1)	G-R - Body ground	A/T shift indicator signal (L)	A/T L indicator OFF --> ON	Below 1 V --> 10 to 14 V
      KEY SW (C11-18) - Body ground	Y - Body ground	Unlock warning switch signal	Key is inserted --> removed	Below 1 V --> 10 to 14 V
      FUEL (C11-19) - Body ground	V - Body ground	Fuel level signal	Ignition switch ON, fuel level is FULL --> EMPTY	Below 1 V --> 10 to 14 V
      AIRBAG (C11-20) - Body ground	B-Y - Body ground	SRS warning light signal	Ignition switch ON, SRS warning light ON --> OFF	8 to 14 V --> Below 1 V
      4P-OUT (C11-21) - Body ground	V-W - Body ground	Speed signal (Output)	Ignition switch ON and turn wheel slowly	Pulse generation (see WAVEFORM 1 )
      HOT (C11-23) - Body ground	Y-R - Body ground	Coolant temperature signal	Ignition switch ON, HOT indicator OFF --> ON	Below 1 V --> 2 to 5 V
      COLD (C11-24) - Body ground	Y - Body ground	Coolant	Ignition switch ON, COLD indicator OFF --> ON	Below 1 V --> 2 to 5 V
      D-DOOR (C11-25) - Body ground	R-Y - Body ground	Driver door condition signal	Driver door OPEN --> CLOSE	Below 1 V --> 10 to 14 V
      DOOR (C11-26) - Body ground	L - Body ground	Except driver door condition signal	Except driver door OPEN --> CLOSE	Below 1 V --> 10 to 14 V
      SLIP (C11-27)(2) - Body ground	B-R - Body ground	SLIP indicator signal	Ignition switch ON, SLIP indicator ON --> OFF	Below 1 V --> 10 to 14 V
      TRAC OFF (C11-30)(2) - Body ground	R-L - Body ground	TRAC OFF indicator signal	Ignition switch ON, TRAC OFF indicator ON --> OFF	Below 1 V --> 10 to 14 V
      CHECK ENGINE (C11-31) - Body ground	Y-R - Body ground	MIL signal	Ignition switch ON, MIL ON --> OFF	Below 1 V --> 10 to 14 V
      CHG- (C11-32) - Body ground	B-W - Body ground	Charge warning light signal	Ignition switch ON, charge warning light OFF --> ON	10 to 14 V --> Below 1 V
      (1) A/T (2) w/ VSC

      If the result is not as specified, the combination meter may be malfunctioning.

      Waveform 1 (Reference):

      WAVEFORM 1
      
      

      Item	Condition
      Tool setting	5 V/DIV., 20 msec./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12.4 mph)

      Fig 2: Waveform Reference Graph (1 Of 2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      As the vehicle speed increases, the wavelength shortens.

      Waveform 2 (Reference):

      WAVEFORM 2
      
      

      Item	Condition
      Tool setting	5 V/DIV., 10 msec./DIV.
      Vehicle condition	Engine idling

      Fig 3: Waveform Reference Graph (2 Of 2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      As the vehicle speed increases, the wavelength shortens.

      Fig 4: Meter / Gauge System - Circuit Diagram (1 Of 3)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 5: Meter / Gauge System - Circuit Diagram (2 Of 3)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 6: Meter / Gauge System - Circuit Diagram (3 Of 3)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Table of terminal connection 

Table of terminal connection