Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

COMBINATION METER

Fig 1: Identifying Combination Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J34-1 (E2) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
J34-2 (FE) - Body ground	BR - Body ground	Ground (Fuel ground)	Always	Below 1 V
J34-3 (GND) - Body ground	W - Body ground	Ground (Engine oil temperature sensor ground)	Always	Below 1 V
J34-4 (INT) - Body ground	LG - Body ground	Tire pressure select switch signal	Engine switch on (IG), tire pressure select display ON	8 to 15 V
J34-4 (INT) - Body ground	LG - Body ground	Tire pressure select switch signal	Engine switch on (IG), tire pressure select display off	Below 1 5 V
J34-5 (+S) - Body ground	P - Body ground	Speed signal (Output)	Wheel turned slowly	Pulse generation (See bwaveform 1)
J34-6 (MPX+) - Body ground	BR - Body ground	Multiplex communication signal	Engine switch on (IG)	Pulse generation
J34-7 (GAGE) - Body ground	L - Body ground	Engine oil temperature sensor signal	Engine switch on (IG), engine oil temperature is about 0°C (32°F)	4 to 6 V
J34-7 (GAGE) - Body ground	L - Body ground	Engine oil temperature sensor signal	Engine switch on (IG), engine oil temperature is about 100°C (212°F)	0 5 to 2 5 V
J34-8 (TC) - Body ground	P - Body ground	Light control rheostat signal	Engine switch on (IG), the light control rheostat knob is at the MAX position (turns fully clockwise)	4 to 6 V
J34-8 (TC) - Body ground	P - Body ground	Light control rheostat signal	Engine switch on (IG), the light control rheostat knob is at the MIN position (turns fully counterclockwise)	Below 1 V
J34-9 (ILL+) - Body ground	V - Body ground	Light control rheostat signal	Engine switch on (IG), combination switch is except on OFF	4 to 6 V
J34-11 (B) - Body ground	G - Body ground	Turn indicator light signal	Engine switch on (IG), turn signal LH indicator light OFF	Below 1 V
J34-11 (B) - Body ground	G - Body ground	Turn indicator light signal	Engine switch on (IG), turn signal LH indicator light blinks	11 to 14 V
J34-12 (IG+) - Body ground	O - Body ground	Engine switch signal	Engine switch off	Below 1 V
J34-12 (IG+) - Body ground	O - Body ground	Engine switch signal	Engine switch on (IG)	11 to 14V
J34-13 (ES) - Body ground	W-B - Body ground	Ground (Signal ground)	Always	Below 1 V
J34-14 (ET) - Body ground	Y - Body ground	Ground (Rheostat ground)	Always	Below 1 V
J34-15 (INT) - Body ground	P - Body ground	Tire pressure initial switch signal	Engine switch on (IG), tire pressure initial message is displayed	8 to 15 V
J34-15 (INT) - Body ground	P - Body ground	Tire pressure initial switch signal	Engine switch on (IG), tire pressure initial message is not displayed	Below 1 5 V
J34-16 (S) - Body ground	W - Body ground	Tachometer signal	Engine switch on (IG), engine idle speed	Pulse generation (See cwaveform 2)
J34-17 (SI) - Body ground	V - Body ground	Speed signal (Input)	Engine switch on (IG), wheel turned slowly	Pulse generation (See bwaveform 1)
J34-18(MPX-) - Body ground	BR - Body ground	Multiplex communication signal	Engine switch on (IG)	Pulse generation
J34-19 (FR) - Body ground	SB - Body ground	Fuel signal	Engine switch on (IG), fuel level is FULL	Below 1 V
J34-19 (FR) - Body ground	SB - Body ground	Fuel signal	Engine switch on (IG), fuel level is EMPTY	4 to 7 V
J34-20 (MSSL) - Body ground	Y - Body ground	Steering pad switch signal	Engine switch on (IG), DISP switch is not pressed	4 to 6 V
J34-20 (MSSL) - Body ground	Y - Body ground	Steering pad switch signal	Engine switch on (IG), DISP switch is pressed	Below 1 V
J34-21 (TR) - Body ground	B - Body ground	Light control rheostat signal	Engine switch on (IG), the light control rheostat knob is at the MIN position (turns fully counterclockwise)	Below 1 V
J34-21 (TR) - Body ground	B - Body ground	Light control rheostat signal	Engine switch on (IG), the light control rheostat knob is at the MAX position (turns fully clockwise)	4 to 6 V
J34-23 (B) - Body ground	L - Body ground	Battery	Always	11 to 14 V
J34-24 (B) - Body ground	LG - Body ground	Battery	Always	11 to 14 V
J35-3 (PBLT) - Body ground	P - Body ground	Front seat inner belt assembly (for passenger side) signal	Sit in the front passenger seat, engine switch on (IG), front passenger side seat belt is unfastened	11 to 14 V
J35-3 (PBLT) - Body ground	P - Body ground	Front seat inner belt assembly (for passenger side) signal	Sit in the front passenger seat, engine switch on (IG), front passenger side seat belt is fastened	Below 1 V
J35-5 (RSEL) - Body ground	GR - Body ground	Satellite switch RH signal	Engine switch on (IG), satellite switch RH is not pressed	11 to 14 V
J35-5 (RSEL) - Body ground	GR - Body ground	Satellite switch RH signal	Engine switch on (IG), satellite switch RH is pressed	Below 1 V
J35-6 (LSEL) - Body ground	O - Body ground	Satellite switch LH signal	Engine switch on (IG), satellite switch LH is not pressed	11 to 14 V
J35-6 (LSEL) - Body ground	O - Body ground	Satellite switch LH signal	Engine switch on (IG), satellite switch LH is pressed	Below 1 V
J35-7 (SET) - Body ground	V - Body ground	Satellite switch ON/OFF signal	Engine switch on (IG), satellite switch ON/OFF is not pressed	11 to 14 V
J35-7 (SET) - Body ground	V - Body ground	Satellite switch ON/OFF signal	Engine switch on (IG), satellite switch ON/OFF is pressed	Below 1 V
J35-9 (ILL-) - Body ground	W - Body ground	Illumination signal	Engine switch on (IG)	11 to 14 V
J35-10 (B) - Body ground	R - Body ground	Turn indicator light signal	Engine switch on (IG), turn signal RH indicator light OFF	Below 1 V
J35-10 (B) - Body ground	R - Body ground	Turn indicator light signal	Engine switch on (IG), turn signal RH indicator light blinks	11 to 14 V
J35-12 (EFI) - Body ground	SB - Body ground	MIL (Check engine indicator light) signal	Engine switch on (IG), MIL ON	Below 1 V
J35-12 (EFI) - Body ground	SB - Body ground	MIL (Check engine indicator light) signal	Engine switch on (IG), MIL OFF	11 to 14 V
J35-15 (SW) - Body ground	LG - Body ground	Brake fluid level warning light signal	Engine switch on (IG), brake warning light OFF	11 to 14 V
J35-15 (SW) - Body ground	LG - Body ground	Brake fluid level warning light signal	Engine switch on (IG), brake warning light ON	Below 1 5 V

Waveform 1 (Reference). Using an oscilloscope

OK:

WAVEFORM REFERENCE

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

HINT.

When the system is functioning normally, one drive wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 2 (Reference): Using an oscilloscope.

OK:

WAVEFORM REFERENCE

Item	Condition
Tool setting	5 V/DIV, 10 ms /DIV
Vehicle condition	Engine idle speed

Fig 3: Identifying Waveform 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 3 (Reference). Using an oscilloscope.

OK:

WAVEFORM REFERENCE

Item	Condition
Tool setting	5 V/DIV, 200 ms /DIV
Vehicle condition	Engine switch on (IG), p-belt warning light blinks

Fig 4: Identifying Waveform 3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CLOCK ASSEMBLY (w/o Navigation System)

Fig 5: Identifying J54 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J54-3 (ILL+) - Body ground	G - Body ground	Illumination signal	Combination switch OFF	Below 1 V
J54-3 (ILL+) - Body ground	G - Body ground	Illumination signal	Combination switch Head	11 to 14 V
J54-4 (IG+) - Body ground	B - Body ground	Engine switch signal	Engine switch off	Below 1 V
J54-4 (IG+) - Body ground	B - Body ground	Engine switch signal	Engine switch on (IG)	11 to 14 V
J54-5 (ACC) - Body ground	O - Body ground	Engine switch signal	Engine switch off	Below 1 V
J54-5 (ACC) - Body ground	O - Body ground	Engine switch signal	Engine switch on (IG)	11 to 14 V
J54-8 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
J54-10 (ILL-) - Body ground	W - Body ground	Illumination Signal	Engine switch on (IG), combination switch Head, and light control rheostat position MAX	Pulse generation (See waveform)
J54-14 (B) - Body ground	LG - Body ground	Battery	Always	11 to 14 V

Waveform (Reference) - Using an oscilloscope

OK:

WAVEFORM REFERENCE

Item	Condition
Tool setting	5 V/DIV, 200 ms /DIV
Vehicle condition	Engine switch on (IG), light control rheostat is in the MID position

Fig 6: Identifying Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CLOCK ASSEMBLY (w/ Navigation System)

Fig 7: Identifying J53 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J53-2 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
J53-4 (ILL+) - Body ground	G - Body ground	Illumination signal	Combination switch OFF	Below 1 V
J53-4 (ILL+) - Body ground	G - Body ground	Illumination signal	Combination switch Head	11 to 14 V
J53-5 (ACC) - Body ground	O - Body ground	Engine switch signal	Engine switch off	Below 1 V
J53-5 (ACC) - Body ground	O - Body ground	Engine switch signal	Engine switch on (IG)	11 to 14 V
J53-6 (B) - Body ground	LG - Body ground	Battery	Always	11 to 14 V
J53-10 (ILL-) - Body ground	W - Body ground	Illumination signal	Engine switch on (IG), combination switch Head, and light control rheostat position MAX	Pulse generation (See waveform)
J53-11 (IG+) - Body ground	B - Body ground	Engine switch signal	Engine switch off	Below 1 V
J53-11 (IG+) - Body ground	B - Body ground	Engine switch signal	Engine switch on (IG)	11 to 14 V

Waveform (Reference). Using an oscilloscope

OK:

WAVEFORM REFERENCE

Item	Condition
Tool setting	5 V/DIV, 200 ms /DIV
Vehicle condition	Engine switch on (IG), light control rheostat is in the MID position

Fig 8: Identifying Waveform

COMBINATION METER INNER CIRCUIT

Combination Meter Inner Circuit

Fig 9: Combination Meter Inner Circuit Diagram (1 Of 3)

Fig 10: Combination Meter Inner Circuit Diagram (2 Of 3)

Fig 11: Combination Meter Inner Circuit Diagram (3 Of 3)

SYMBOL CHART

Terminal No.		Wire Harness Side (Symbol)
J34	1	Ground (E2)
	2	Fuel Sender Gauge Assembly (Sub) (FE)
	3	Engine Oil Temperature Sensor (GND)
	4	Tire Pressure Warning ECU (INT)
	5	Each part that uses speed signal (+S)
	6	Multiplex Communication Line (MPX+)
	7	Engine Oil Temperature Sensor (GAGE)
	8	Light Control Rheostat (TC)
	9	Light Control Rheostat (ILL+)
	10	-
	11	Turn Signal Flasher (B)
	12	GAUGE Fuse (IG+)
	13	Ground (ES)
	14	Light Control Rheostat (ET)
	15	Tire Pressure Warning ECU (INT)
	16	ECM (S)
	17	Skid Control ECU (SI)
	18	Multiplex Communication Line (MPX-)
	19	Fuel Sender Gauge Assembly (FR)
	20	Steering Pad Switch (MSSL)
	21	Light Control Rheostat (TR)
	22	-
	23	DOME Fuse (B)
	24	MPX-B Fuse (B)
J35	1	-
	2	-
	3	Clock Assembly (PBLT)
	4	-
	5	Satellite Switch (RSEL)
	6	Satellite Switch (LSEL)
	7	Satellite Switch (SET)
	8	-
	9	Illumination Parts (ILL-)
	10	Turn Signal Flasher (B)
	11	-
	12	ECM (EFI)
	13	-
	14	-
	15	Brake Fluid Level Warning Switch (SW)
	16	-