Terminals Of Ecu

CHECK COMBINATION METER ASSEMBLY

Fig 1: Combination Meter Assembly Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the C37 combination meter assembly connector.

Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
C37-1 (B) - Body ground	W - Body ground	Battery	Always	11 to 14 V
C37-2 (IG+) - Body ground	P - Body ground	Ignition switch signal	Ignition switch off → ON	Below 1 V → 11 to 14 V
C37-24 (ET) - Body ground	BR - Body ground	Ground	Always	Below 1 V

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

Reconnect the combination meter assembly connector.

Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
C36-1 (CHG-) - Body ground	Y - Body ground	Charge warning light signal	Engine start, Charge warning light OFF → ON	11 to 14 V → Below 1 V
C36-2 (SW) - Body ground	Y - Body ground	Brake fluid level warning light signal	Ignition switch ON, Brake fluid level warning light OFF → ON	11 to 14 V → Below 1 V
C36-3 (EFI) - Body ground	P - Body ground	Check engine warning light signal	Ignition switch ON, Check engine warning light OFF → ON	11 to 14 V → Below 1 V
C36-4 (WLVL)*1 - Body ground	LG - Body ground	Washer level warning signal	Ignition switch ON, Washer level warning light OFF → ON	11 to 14 V → Below 1 V
C36-5 (S) - Body ground	Y - Body ground	Engine oil pressure signal	Ignition switch ON, Oil pressure warning light OFF → ON	11 to 14 V → Below 1 V
C36-8 (HEAD)*2 - Body ground	R - Body ground	Headlight indicator signal	Headlight indicator light OFF → ON	Below 1 V → 11 to 14 V
C36-9 (WRNP) - Body ground	BE - Body ground	Seat belt warning signal (Passenger side)	Ignition switch ON, Front passenger seat belt warning light OFF → BLINKS	Below 1 V → 11 to 14 V ←→ Below 1 V
C36-12 (-) - Body ground	W-B*3 - Body ground	Hi beam signal	BEAM indicator light OFF → ON	11 to 14 V → Below 1 V
C36-12 (-) - Body ground	L*4 - Body ground	Hi beam signal	BEAM indicator light OFF → ON	11 to 14 V → Below 1 V
C36-14 (+) - Body ground	R - Body ground	Hi beam signal	BEAM indicator light OFF → ON	Below 1 V → 11 to 14 V
C36-15 (B) - Body ground	L - Body ground	Right turn signal	Right turn indicator light OFF → ON	Below 1 V → 11 to 14 V
C36-16 (B) - Body ground	Y - Body ground	Left turn signal	Left turn indicator light OFF → ON	Below 1 V → 11 to 14 V
C37-6 (ILL-) - Body ground	W - Body ground	Light control rheostat signal	Ignition switch off → ON	Pulse generation (See waveform 1)
C37-9 (TIRE) - Body ground	P - Body ground	Tire pressure warning light signal	Ignition switch ON, Tire pressure warning light OFF → ON	3.2 V or higher → 0.9 to 3.2 V
C37-11 (CANH) - Body ground	G - Body ground	CAN communication line	Ignition switch ON	Pulse generation
C37-12 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
C37-13 (ILL+) - Body ground	G - Body ground	Tail switch signal	Tail switch off → on	Below 1 V → 11 to 14 V
C37-14 (TC) - Body ground	G - Body ground	Tail cancel switch signal	Ignition switch ON, Tail cancel switch off → on	4 to 6 V → Below 1 V
C37-15 (LP)*1 - Body ground	Y - Body ground	Security indicator light signal	Security indicator light OFF → ON	Below 1 V → 11 to 14 V
C37-17 (L) - Body ground	Y - Body ground	Fuel signal	Ignition switch ON Fuel level is full → empty	Below 1 V → 3 to 7 V
C37-18 (TEMP) - Body ground	W - Body ground	Outside temperature signal	Ignition switch ON outside temperature 25 °C	Approximately 1.3 V
C37-19 (SI) - Body ground	V - Body ground	Vehicle speed signal (Input)	Driving at approximately 20 km/h (12 mph)	Pulse generation (See waveform 2)
C37-20 (+S) - Body ground	V - Body ground	Vehicle speed signal (Output)	Driving at approximately 20 km/h (12 mph)	Pulse generation (See waveform 2)
C37-22 (E) - Body ground	BR - Body ground	Ground (Fuel ground)	Always	Below 1 V
C37-23 (TX1+) - Body ground	G - Body ground	Ground (Temperature ground)	Always	Below 1 V

*1: for Canada
*2 : for U.S.A.
*3: w/o Daytime Running Light
*4: w/ Daytime Running Light

If the result is not as specified, the combination meter assembly may have a malfunction.

Waveform 1: Using an oscilloscope

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Terminal Connections	C37-6 (ILL-) - Body Ground
Tester Range	5 V/DIV., 50 ms./DIV.
Vehicle Condition	Ignition switch ON

Waveform 2: Using an oscilloscope

Fig 3: Identifying Waveform 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Terminal Connections	C37-19 (SI) - Body ground C37-20 (+S) - Body ground
Tester Range	5 V/DIV., 20 ms./DIV.
Vehicle Condition	Driving at approximately 20 km/h (12 mph)

HINT:

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

CHECK MAIN BODY ECU

Fig 4: Main Body ECU Connector Terminal Identification (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Main Body ECU Connector Terminal Identification (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the 2A, 2E and C45 main body ECU connectors.

Measure the resistance according to the value(s) in the table below.

Terminals No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
2A-21 (DCTY) - Body ground	W - Body ground	Driver side door courtesy switch input	Driver door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
2E-20 (PCTY) - Body ground	BR - Body ground	Passenger side door courtesy switch input	Passenger door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
2E-19 (RCTY) - Body ground	LG - Body ground	Rear RH door courtesy switch input	Rear RH door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
C45-13 (LCTY) - Body ground	SB - Body ground	Rear LH door courtesy switch input	Rear LH door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
2A-7 (BCTY) - Body ground	LG - Body ground	Back door courtesy switch input	Back door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
2E-23 (KSW) - 2E-17 (GND1)	L - W-B	Key unlock warning switch signal	Key inserted → removed	10 kΩ or higher → Below 1 Ω
2E-17 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

Reconnect the main body ECU connectors.

Measure the voltage according to the value(s) in the table below.

Terminals No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
2C-5 (PKB) - 2E-17 (GND1)	B - W-B	Parking brake signal	Ignition switch ON, Parking brake warning light OFF → ON	11 to 14 V → Below 1 V
C45-22 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
C45-23 (CANH) - Body ground	R - Body ground	CAN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the main body ECU may have a malfunction.

COMBINATION METER INTERNAL CIRCUIT

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

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

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

CONNECTORS

Terminal No.		Wire Harness Side
C36	1	Generator assembly
	2	Brake fluid level warning switch
	3	ECM
	4*1	Washer level warning switch
	5	Engine oil pressure switch assembly
	8*2	H-LP relay
	9	Telltale light assembly
	12	Body ground3 Running light relay assembly4
	14	DIMMER relay
	15	Turn signal flasher relay
	16	Turn signal flasher relay
C37	1	Battery
	2	IG2 relay
	6	Light control rheostat
	9	Tire pressure warning ECU
	11	CAN communication line
	12	CAN communication line
	13	T-LP relay
	14	Light control rheostat
	15*1	Transponder key ECU assembly
	17	Fuel sender gauge assembly
	18	Ambient temperature sensor
	19	Brake actuator assembly
	20	Other ECU (4P-OUT)
	22	Fuel sender gauge assembly
	23	Ambient temperature sensor
	24	Body ground

*1: for Canada
*2: for U.S.A.
*3: w/o Daytime Running Light
*4: w/ Daytime Running Light