Terminals Of Ecu [08/2014 - ]

CHECK COMBINATION METER ASSEMBLY

Fig 1: Combination Meter Assembly Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the D1 combination meter assembly connector.

Measure the voltage and resistance of the wire harness side connector.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
D1-1 (IG+) - Body ground	SB - Body ground	Ignition switch signal	Ignition switch off → ON	Below 1 V → 11 to 14 V
D1-2 (B) - Body ground	P - Body ground	Battery	Always	11 to 14 V
D1-24 (ET) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω

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

Reconnect the D1 combination meter assembly connector.

Measure the voltage and resistance of the wire harness side connector.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
D1-3 (L) - Body ground	GR - Body ground	Fuel level signal	Ignition switch ON Fuel level is FULL → EMPTY	Below 1 V → 4.5 to 9.0 V
D1-4 (TX1-) - Body ground	V - Body ground	Ambient temperature sensor signal	Ignition switch ON	4.5 to 5.5 V
D1-5 (IND1) - Body ground	BE - Body ground	Illumination signal	Light control switch OFF → ON	Below 1 V → 11 to 14 V
D1-6 (IND2) - Body ground	W - Body ground	Illumination signal	Light control switch OFF → ON	Below 1 V → 11 to 14 V
D1-8 (FUS-) - Body ground	BR - Body ground	Fuel sender gauge ground	Always	Below 1 Ω
D1-11 (SW2) - Body ground	P - Body ground	Light control rheostat signal	Ignition switch OFF → ON	Pulse generation
D1-13 (TIRE) - Body ground	LG - Body ground	Tire pressure warning light signal	Ignition switch ON, Tire pressure warning light, ON	0.9 to 3.2 V
D1-13 (TIRE) - Body ground	LG - Body ground	Tire pressure warning light signal	Ignition switch ON, Tire pressure warning light OFF	3.2 V or higher
D1-15 (LP)*1 - Body ground	SB - Body ground	Security indicator light signal	Security indicator light OFF → ON	Below 1 V → 11 to 14 V
D1-16 (+S) - Body ground	BR - Body ground	Speed signal (Output)	Driving at approximately 20 km/h (12 mph)	Pulse generation (See waveform 1, Fig 2)
D1-17 (SI) - Body ground	G - Body ground	Speed signal (Input)	Driving at approximately 20 km/h (12 mph)	Pulse generation (See waveform 1, Fig 2)
D1-20 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
D1-21 (CANH) - Body ground	G - Body ground	CAN communication line	Ignition switch ON	Pulse generation
D1-23 (TX1+) - Body ground	L - Body ground	Ambient temperature sensor ground	Always	Below 1 Ω
D2-1 (B) - Body ground	P - Body ground	Left turn signal	Ignition switch ON Left turn indicator light OFF → ON	Below 1 V → 11 to 14 V
D2-5 (EFI) - Body ground	BR - Body ground	Check engine warning light signal	Check engine warning light ON → OFF	Below 1 V → 11 to 14 V
D2-6 (WLVL) - Body ground	BE - Body ground	Washer level warning switch signal	Washer level warning light ON → OFF	Below 1 V → 11 to 14 V
D2-7 (SW) - Body ground	W - Body ground	Brake fluid level warning light signal	Ignition switch ON Brake fluid level warning light ON → OFF	Below 1 V → 11 to 14 V
D2-8 (CHG-) - Body ground	R - Body ground	Charge warning light signal	Engine start Charge warning light ON → OFF	Below 1 V → 11 to 14 V
D2-10 (B) - Body ground	L - Body ground	Right turn signal	Ignition switch ON Right turn indicator light OFF → ON	Below 1 V → 11 to 14 V
D2-13 (S) - Body ground	LG - Body ground	Engine oil pressure signal	Engine oil pressure warning light ON → OFF	Below 1 V → 11 to 14 V
D2-16 (PBLT) - Body ground	Y - Body ground	Passenger seat belt warning light signal	Ignition switch ON Passenger seat belt warning light OFF → ON → OFF	Below 1 V → 11 to 14 V → Below 1 V

*1: w/ Engine Immobiliser System

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 Graph (Reference)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Terminal Connections	D1-16 (+S) and Body ground D1-17 (SI) and Body ground
Tool Setting	5 V/DIV, 20 ms/DIV
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 AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Fig 3: Main Body ECU And Instrument Panel Junction Block Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

*1	Instrument Panel Junction Block Assembly

Fig 4: Main body ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

*1	Main body ECU

Remove the main body ECU.
Disconnect the D42 main body ECU connector.
Disconnect the 3A and 3E instrument panel junction block assembly connector.

Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
3F-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
3F-29 (ACC) - Body ground	-	Ignition power supply (ACC signal)	Ignition switch ACC → off	11 to 14 V → Below 1 V
3F-30 (BECU) - Body ground	-	+B (power system signal system) power supply	Always	11 to 14 V
3A-1 (ALTB) - Body ground	-	+B (power system alternator system) power supply	Always	11 to 14 V
3F-32 (IG) - Body ground	-	Ignition power supply (IG signal)	Ignition switch ON → off	11 to 14 V → Below 1 V
3E-35 (FRCY) - Body ground	B - Body ground	Driver side door courtesy switch input	Driver door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
3E-24 (FLCY) - Body ground	G - Body ground	Passenger side door courtesy switch input	Passenger door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω
D42-17 (KSW) - Body ground	LG - Body ground	Key unlock warning switch signal	Key inserted → removed	10 kΩ or higher → Below 1 Ω
D42-19 (BCTY) - Body ground	V - Body ground	Back door courtesy switch input	Back door CLOSED → OPEN	10 kΩ or higher → Below 1 Ω

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

Reinstall the main body ECU.
Reconnect the main body ECU connectors.

Measure the voltage between each terminal of the wire harness side connectors and body ground.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
3C-33 (PKB) - Body ground	R - Body ground	Parking brake signal	Parking brake warning light ON → OFF	Below 1 V → 11 to 14 V
D42-13 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
D42-14 (CANH) - Body ground	R - Body ground	CAN communication line	Ignition switch ON	Pulse generation

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

COMBINATION METER INTERNAL CIRCUIT

Fig 5: Combination Meter Internal Circuit (1 Of 3)

Fig 6: Combination Meter Internal Circuit (2 Of 3)

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

CONNECTORS

Terminal No.		Wire Harness Side
D1	1	IG2 relay
	2	Battery
	3	Fuel sender gauge assembly
	4	Ambient temperature sensor
	5	Other illuminations
	6	Other illuminations
	8	Fuel sender gauge assembly
	11	Light control rheostat
	13	Tire pressure warning ECU
	15	Main body ECU
	16	Other ECU
	17	Brake actuator assembly
	20	CAN communication line
	21	CAN communication line
	23	Ambient temperature sensor
	24	Body ground
D2	1	Turn signal flasher assembly
	5	ECM
	6	Level warning switch
	7	Brake fluid level warning switch
	8	Generator
	10	Turn signal flasher assembly
	13	Engine oil pressure switch
	16	Telltale light assembly