System Diagram

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Meter Gauge System Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Meter Gauge System Diagram (2 Of 2)

Communication table:

COMMUNICATION CHART

Sender	Receiver	Communication Signal	Communication Line
No 1 meter ECU	ECM Air conditioning amplifier Center airbag sensor Main body ECU	Vehicle speed signal	CAN
	Certification ECU Parking assist ECU2 Clearance warning ECU3 Tilt & telescopic ECU	Vehicle speed signal
	Main body ECU (driver side junction block) Air conditioning amplifier	Rheostat duty signal
	Main body ECU	Lounge illumination signal
	Air conditioning amplifier ECM	Vehicle specification signal (Destination/Handle code)
	Certification ECU	Odometer signal
	Multi-display	Front passenger side seat belt warning light signal 4P output signal	Direct Line
ECM	No 1 meter ECU	Starter signal Test mode signal CRUISE main indicator light signal Cruise control warning signal Engine coolant temperature signal Shift position signal Reject buzzer signal Gear position signal Engine RPM data Fuel injection signal Diagnosis signal	CAN
ECM	No 1 meter ECU	MIL signal	Direct line
Electric parking brake ECU	No 1 meter ECU	Parking brake switch signal Brake warning light signal/ yellow	Direct line
Main body ECU (driver side junction block)	No 1 meter ECU	Illuminance data Auto dimmer signal ACC switch signal Key switch signal Each door courtesy switch signal Slide roof signal6 Key signal Driver side seat belt switch signal High beam indicator light signal HEAD indicator light signal2 Fr FOG indicator light signal Rr FOG indicator light signal1 TAIL indicator light signal1 Diagnosis signal Stop switch signal Meter illumination light up signal Vehicle destination package signal Display switch reset signal Sliding roof warning signal*6	CAN
Certification ECU	No 1 meter ECU	Inside key existence warning signal Low key battery warning signal Shift position warning signal Meter buzzer request signal Door unlock mode display signal Steering lock warning signal	CAN
Parking assist ECU2 Clearance warning ECU3	No 1 meter ECU	Clearance warning display signal Sensor diagnosis signal	CAN
Skid control ECU	No 1 meter ECU	ABS warning light ON signal Brake warning light ON signal Brake control warning light ON signal Slip indicator light ON signal Speedometer signal Brake hold indicator signal	CAN
Tire pressure warning ECU	No 1 meter ECU	Tire pressure warning light signal	CAN
Driving support ECU4, 5	No 1 meter ECU	Diagnosis signal Vehicle-to-vehicle distance control signal Vehicle-to-vehicle distance signal Front millimeter wave radar sensor grime signal Bad weather detection signal Approach warning signal Preceding vehicle detection signal Front millimeter wave radar sensor beam axis deviation signal CRUISE main indicator light signal Dynamic radar cruise warning signal Cruise control vehicle speed signal Constant speed cruise signal	CAN
Air conditioning amplifier	No 1 meter ECU	Ambient temperature display signal Air conditioning filter replacement signal	CAN
Center airbag sensor	No 1 meter ECU	Airbag warning light signal Front passenger seat condition signal Front passenger seat belt condition signal Diagnosis signal	CAN
Seat belt control ECU*5	No 1 meter ECU	PCS indicator light signal Radar sensor information signal PCS system information signal Pre-collision off switch signal*4	CAN
ECM	No 1 meter ECU	Shift position P signal Shift position R signal Shift position N signal Shift position D signal Shift position 8 signal Shift position 7 signal Shift position 6 signal Shift position 5 signal Shift position 4 signal Shift position 3 signal Shift position 2 signal Shift position 1 signal Sports mode indicator signal TM oil temperature range Sports mode enable signal Shift position signal Hybrid POWER indicator light signal Hybrid SNOW indicator light signal Sports shift reject buzzer signal CHARGE indicator light signal	CAN
AFS ECU	No 1 meter ECU	AFS OFF indicator light signal	CAN
Front controller	No 1 meter ECU	Hood courtesy switch signal CHARGE indicator light signal Oil level signal Oil pressure signal Washer level signal	CAN
Rear junction block ECU	No 1 meter ECU	Taillight signal Brake pad wear signal Remaining fuel signal	CAN
Suspension control ECU	No 1 meter ECU	TEMS SPORT indicator light signal TEMS COMFORT indicator light signal HEIGHT HIGH indicator light signal	CAN
Steering pad switch	No 1 meter ECU	Steering pad switch operation signal	CAN
Fuel sender gauge	No 1 meter ECU	Fuel level signal	CAN
Turn signal flasher relay	No 1 meter ECU	Turn signal indicator light (LH/RH) signal	Direct Line
Washer level switch	No 1 meter ECU	Washer fluid level warning light signal	CAN
Brake fluid level warning switch	No 1 meter ECU	Brake fluid level warning light signal	CAN
Light control rheostat	No 1 meter ECU	Illumination signal	Direct Line
Engine oil level sensor	No 1 meter ECU	Engine oil level signal	CAN
Light failure sensor	No 1 meter ECU	Rear light indicator light signal	CAN
Generator	No 1 meter ECU	CHARGE warning light signal	CAN
Engine oil pressure switch	No 1 meter ECU	Engine oil pressure signal	CAN
ECM	No 1 meter ECU	MIL warning light signal	Direct Line
HINT: 1 except U.S.A 2. w/ Advanced parking guidance system 3. w/o Advanced parking guidance system 4: w/ Dynamic radar cruise control system 5 w/ Pre-colhsion system 6: w/ Sliding roof