Terminals Of Ecu

Combination Meter Assembly

Fig 1: Identifying Combination Meter Assembly Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL DESCRIPTION CHART

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
POWER GND (C11-1) - Body ground	W-B - Body ground	Ground (Power ground)	Always	Below 1 V
ILL- (C11-2) - Body ground	B - Body ground	Illumination signal	Turn the ignition switch to the ON position, combination switch TAIL	Below 1 V → 10 to 16 V
CHECK ENGINE (C11-4) - Body ground	L - Body ground	Check engine signal	Turn the ignition switch to the ON position, check engine warning light OFF → ON	10 to 16 V → Below 1.5 V
MPX+ (C11-5) - Body ground	SB - Body ground	Communication line	Always	10 kΩ or higher
SPEED SIGNAL (4P) (C11-6) - Body ground	W - Body ground	Speed signal (Output)	Turn the ignition switch to the ON position, turn the wheel slowly	Pulse generation (See awaveform 1)
IG2 (C11-8) - Body ground	SB - Body ground	Battery	Turn the ignition switch off → ON position	Below 1 V → 10 to 16 V
TURN R (C11-13) - Body ground	GR - Body ground	Turn signal flasher	Turn the ignition switch to the ON position, turn signal RH indicator light OFF → ON	Below 1 V → 10 to 16 V
TURN L (C11-14) - Body ground	L - Body ground	Turn signal flasher	Turn the ignition switch to the ON position, turn signal LH indicator light OFF → ON	Below 1 V → 10 to 16 V
ECU+B (C11-15) - Body ground	LG - Body ground	Battery	Always	10 to 16 V
DOME +B (C11-16) - Body ground	V - Body ground	Battery	Always	10 to 16 V
SIGNAL GND (C12-1) - Body ground	W-B - Body ground	Ground (Signal ground)	Always	Below 1 V
FE (C12-2) - Body ground	V - Body ground	Ground (Fuel ground)	Always	Below 1
MPX- (C12-4) - Body ground	Y - Body ground	Communication line	Always	10 kΩ or higher
FUEL LID A PIN (C12-6) - Body ground	BR - Body ground	Multi-information display signal	Combination meter displays "PLEASE WAIT NOW OPENING" in the multi-information display	Below 1 V
FUEL LID B PIN (C12-7) - Body ground	B - Body ground	Multi-information display signal		10 to 14 V
FUEL LID A PIN (C12-6) - Body ground	BR - Body ground	Multi-information display signal	Combination meter displays "REFUEL READY" in the multi-information display	10 to 14 V
FUEL LID B PIN (C12-7) - Body ground	B - Body ground	Multi-information display signal		10 to 14 V
FUEL LID A PIN (C12-6) - Body ground	BR - Body ground	Multi-information display signal	Combination meter displays "CLOSE FUEL LID" in the multi-information display	10 to 14 V
FUEL LID B PIN (C12-7) - Body ground	B - Body ground	Multi-information display signal		Below 1 V
FUEL LID A PIN (C12-6) - Body ground	BR - Body ground	Multi-information display signal	Combination meter displays "OFF" in the multi-information display	Below 1 V
FUEL LID B PIN (C12-7) - Body ground	B - Body ground	Multi-information display signal		Below 1 V
POWER METER (C12-8) - Body ground	W - Body ground	Power meter signal	Turn the ignition switch off → ON position	Pulse generation (See bwaveform 2)
SPEED SIGNAL (C12-18) - Body ground	GR - Body ground	Speed signal (Input)	Turn the ignition switch to the ON position, turn the wheel slowly	Pulse generation (See awaveform 1)
FUEL SENDER (C12-19) - Body ground	O - Body ground	Fuel level signal	Turn the ignition switch to the ON position, fuel level MIN → MAX	4 to 9 V → Below 2 V
WASHER LEVEL (C12-24) - Body ground	BR - Body ground	Washer level indicator light signal	Turn the ignition switch to the ON position, washer level indicator light OFF → ON	10 to 16 V → Below 1 V

Waveform 1 (Reference): Using an oscilloscope:

Fig 2: Identifying Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM REFERENCE

Item	Condition
Tool setting	5 V/DIV., 20 ms/DIV.
Vehicle condition	Driving at approx. 20 km/h (12 mph)

HINT:

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

Waveform 2 (Reference): Using an oscilloscope:

Fig 3: Signal Waveform Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM REFERENCE

Item	Condition
Tool setting	1 V/DIV., 2 μsec/DIV.
Vehicle condition	Turn the ignition switch to the ON position

Integration Control & Panel Assembly (w/o Navigation System)

Fig 4: Identifying Integration Control & Panel Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL DESCRIPTION CHART

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
A10-2 (IG) - A10-11 (GND)	BR - W-B	Main power supply	Ignition switch: LOCK or ACC	Below 1 V
A10-2 (IG) - A10-11 (GND)	BR - W-B	Main power supply	Ignition switch: ON	10 to 14 V
A10-11 (GND) - Body ground	W-B - Body ground	Ground for main power supply	Always	Below 1 V
A10-12 (+B) - A10-11 (GND)	W - W-B	Back up power supply	Always	10 to 14 V
A10-13 (ACC) - A10-11 (GND)	GR - W-B	Power supply for accessories	Ignition switch: ACC	10 to 14 V
A10-13 (ACC) - A10-11 (GND)	GR - W-B	Power supply for accessories	Ignition switch: except ACC	Below 1 V

Waveform (Reference): Using an oscilloscope:

Fig 5: Oscilloscope Waveform Graph 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM REFERENCE

Item	Condition
Tool setting	5V/DIV., 2ms/DIV.
Vehicle condition	Turn the ignition switch to the ON position, light control rheostat is in the MID position.

Multi-Display (w/ Navigation System)

Fig 6: Identifying ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL DESCRIPTION CHART

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
GND1 (M3-3) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
IG (M3-10) - Body ground	O - Body ground	Ignition Switch Signal	Turn the ignition switch off → ON position	Below 1 V → 10 to 16 V
ACC (M3-11) - Body ground	BR - Body ground	Ignition Switch Signal	Turn the ignition switch e off → ON position	Below 1 V → 10 to 16 V
+B1 (M3-12) - Body ground	V - Body ground	Battery	Always	10 to 16 V
PBEW (M3-21) - Body ground	LG - Body ground	Passenger Seat Belt Indicator Light Signal	Turn the ignition switch to the ON position, passenger seat belt indicator light OFF → ON	Pulse generation (See awaveform)

Waveform (Reference): Using an oscilloscope:

Fig 7: Identifying Waveform

WAVEFORM REFERENCE

Item	Condition
Tool setting	5 V/DIV., 200 ms/DIV.
Vehicle condition	Turn the ignition switch to the ON position, p-belt indicator light blinks.

COMBINATION METER INNER CIRCUIT

Fig 8: Combination Meter Inner Circuit Diagram (1 Of 2)

Fig 9: Combination Meter Inner Circuit Diagram (2 Of 2)

TERMINAL DESCRIPTION CHART

Terminal No.		Wire harness side
C11	1	Ground (Power Ground)
	2	Each part that uses illumination signal (Audio Controller, Integration Control & Panel Assembly, Console Box, Multi-display)
	3	-
	4	Hybrid Vehicle Control ECU (Check Engine)
	5	Multiplex Communication Line
	6	Each part that uses speed signal
	7	-
	8	IGN Fuse
	9	-
	10	-
	11	-
	12	-
	13	Turn Signal Flasher R
	14	Turn Signal Flasher L
	15	ECU-B No. 1 Fuse
	16	DOME Fuse
C12	1	Ground (Signal Ground)
	2	Ground (Fuel Ground)
	3	-
	4	Multiplex Communication Line
	5	-
	6	Hybrid Vehicle Control ECU (Fuel Lid A Pin)
	7	Hybrid Vehicle Control ECU (Fuel Lid B Pin)
	8	Hybrid Vehicle Control ECU (Power Meter)
	9	-
	10	-
	11	-
	12	-
	13	-
	14	-
	15	-
	16	-
	17	-
	18	ABS & Traction Actuator Assembly
	19	Fuel Sender Gauge Assembly
	20	-
	21	-
	22	-
	23	-
	24	Washer Level Warning Switch