Contents Wiring diagrams Section: Gauges & Instrument Panels All sections

Meter: Other Lexus LS IV

Gauges & Instrument Panels 18 illustrations ~1036 words

PRECAUTION

  1. NOTICE FOR INITIALIZATION NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. SYSTEM NAME REFERENCE CHART System Name See procedure Navigation System (for DVD) «INITIALIZATION»(ref-349706-S07943075812009120800000) Advanced Parking Guidance System Power Trunk Lid System Rear Door Sunshade System

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Scheme 48: PARTS LOCATION

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Scheme 56: SYSTEM DIAGRAM

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Communication table

SenderReceiverCommunication SignalCommunication Line
No. 1 meter ECUECM Air conditioning amplifier Center airbag sensor Main body ECUVehicle speed signalCAN
Certification ECU Parking assist ECU*3 Clearance warning ECU*4 Tilt & telescopic ECU
Main body ECU (driver side junction block) Air conditioning amplifierRheostat duty signal
Main body ECULounge illumination signal
Air conditioning amplifier ECMVehicle specification signal (Destination/Handle code)
Certification ECUOdometer signal
Multi-display*7 Integration control and panel*8Front passenger side seat belt warning light signal 4P out signalDirect Line
ECMNo. 1 meter ECUStarter signal Test mode signal CRUISE main indicator light signal*1 Cruise control warning signal*1 Engine coolant temperature signal Shift position signal Reject buzzer signal Gear position signal Engine RPM data Fuel injection signal Diagnosis signalCAN
MIL signalDirect line
Electric parking brake ECUNo. 1 meter ECUParking brake switch signalCAN
Main body ECU (driver side junction block)No. 1 meter ECUIlluminance data Auto dimmer signal ACC switch signal Key switch signal Each door courtesy switch signal Slide roof signal*9 Key signal Driver side seat belt switch signal High beam indicator light signal HEAD indicator light signal*3 Fr. FOG indicator light signal Rr. FOG indicator light signal*2 TAIL indicator light signal*2 Diagnosis signal Stop switch signal Meter illumination light up signal Vehicle destination package signal Display switch reset signal Sliding roof warning signal*9CAN
Certification ECUNo. 1 meter ECUInside 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 signalCAN
Parking assist ECU*3 Clearance warning ECU*4No. 1 meter ECUClearance warning display signal Sensor diagnosis signalCAN
Skid control ECUNo. 1 meter ECUABS 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 signalCAN
Tire pressure warning ECUNo. 1 meter ECUTire pressure warning light signalCAN
Driving support ECU*5, *6No. 1 meter ECUDiagnosis 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*1 Constant speed cruise signalCAN
Air conditioning amplifierNo. 1 meter ECUAmbient temperature display signal Air conditioning filter replacement signalCAN
Center airbag sensorNo. 1 meter ECUAirbag warning light signal Front passenger seat condition signal Front passenger seat belt condition signal Diagnosis signalCAN
Seat belt control ECU*6No. 1 meter ECUPCS indicator light signal Radar sensor information signal PCS system information signal Pre-collision off switch signal*6CAN
ECT ECUNo. 1 meter ECUShift position P signal Shift position R signal Shift position N signal Shift position D 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 ECT POWER indicator light signal ECT SNOW indicator light signal Sports shift reject buzzer signal CHARGE indicator light signalCAN
AFS ECUNo. 1 meter ECUAFS OFF indicator light signalCAN
Front controllerNo. 1 meter ECUHood courtesy switch signal CHARGE indicator light signal Oil level signal Oil pressure signal Washer level signalCAN
Rear junction block ECUNo. 1 meter ECUTaillight signal Brake pad wear signal Remaining fuel signalCAN
Suspension control ECUNo. 1 meter ECUTEMS SPORT indicator light signal TEMS COMFORT indicator light signal HEIGHT HIGH indicator light signalCAN
Steering pad switchNo. 1 meter ECUSteering pad switch operation signalCAN
Fuel sender gaugeNo. 1 meter ECUFuel level signalCAN
Turn signal flasher relayNo. 1 meter ECUTurn signal indicator light (LH/RH) signalDirect Line
Washer level switchNo. 1 meter ECUWasher fluid level warning light signalCAN
Brake fluid level warning switchNo. 1 meter ECUBrake fluid level warning light signalCAN
Light control rheostatNo. 1 meter ECUIllumination signalDirect Line
Engine oil level sensorNo. 1 meter ECUEngine oil level signalCAN
Light failure sensorNo. 1 meter ECURear light indicator light signalCAN
GeneratorNo. 1 meter ECUCHARGE warning light signalCAN
Engine oil pressure switchNo. 1 meter ECUEngine oil pressure signalCAN
ECMNo. 1 meter ECUMIL warning light signalDirect Line
HINT: *1: w/ Cruise control system *2: except U.S.A. *3: w/ Advanced parking guidance system *4: w/o Advanced parking guidance system *5: w/ Dynamic radar cruise control system *6: w/ Pre-collision system *7: w/ Multi-display *8: w/o Multi-display *9: w/ Sliding roof system

COMMUNICATION CHART

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Scheme 58: SYSTEM DESCRIPTION

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  1. METER GAUGE AND WARNING/INDICATOR Gauge: GAUGE REFERENCE CHART Item Detail Speedometer Based on signal received from wheel speed sensor, skid control ECU calculates vehicle speed and transmits data to meter (CAN) Tachometer ECM transmits tachometer signal to the No. 1 meter ECU (CAN) Engine Coolant Temperature Gauge Displays water temperature based on signals from ECM (CAN) Fuel Receiver Gauge Fuel sender gauge sends gauge data to meter display from rear junction block ECU (CAN) HINT: *1: for U.S.A. *2: except U.S.A. *3: w/ Cruise control system *4: w/ Dynamic radar cruise control system *5: w/ Pre-collision system Warning/Indicator: WARNING/INDICATOR REFERENCE CHART Item Detail A/T P shift position indicator Receives P signal from ECM (CAN) A/T R shift position indicator Receives R signal from ECM (CAN) A/T N shift position indicator Receives N signal from ECM (CAN) A/T D shift position indicator Receives D signal from ECM (CAN) A/T S (1 to 8) shift position indicator Receives S (1 to 8) signal from ECM (CAN) Turn signal indicator light (LH/RH) Receives turn signal from flasher relay (Direct line) BEAM indicator light Receives beam signal from main body ECU (CAN) Fr. FOG indicator light Receives front fog light signal from main body ECU (CAN) Rr. FOG indicator light*1 Receives rear fog light signal from main body ECU (CAN) CHARGE warning light Receives malfunction charge signal from ECM (CAN) MIL Receives malfunction check signal from ECM (Direct line) DOOR indicator light Open door indicator illuminates when receiving signal from main body ECU (CAN) Driver side seat belt warning light Receives driver seat belt signal (unfastened) from main body ECU (CAN) CRUISE main indicator light*2,*3 Receives cruise actuation signal from driving support ECU*2 (ECM*3) (CAN) SRS warning light Receives airbag warning signal from center airbag sensor (CAN) SLIP indicator light Receives slip actuation signal from skid control ECU (CAN) ABS warning light Receives ABS warning signal from skid control ECU (CAN) Brake warning light/red (malfunction) Receives warning signal from skid control ECU (LIN) Brake warning light/yellow (minor malfunction) Brake hold standby indicator light Brake hold operated indicator light Receives warning signal from skid control ECU (CAN) TEMS SPORT indicator light Receives sports mode signal from suspension control ECU (CAN) TEMS COMFORT indicator light Receives comfort mode signal from suspension control ECU (CAN) ECT POWER indicator light Receives power mode signal from ECM (CAN) ECT SNOW indicator light Receives snow mode signal from ECM (CAN) AFS OFF indicator light Receives AFS OFF signal from AFS ECU (CAN) HEAD indicator light*4 TAIL indicator light*1 Receives taillight or headlight malfunction signal from main body ECU (CAN) PARK indicator light Receives park warning light signal from electric parking brake ECU (CAN) EPS warning light Receives power steering warning signal from power steering ECU (CAN) Tire pressure warning light Receives tire pressure warning signal from tire pressure warning ECU (CAN) PCS warning light*5 Receives pre-collision warning signal from seat belt control ECU (CAN) HEIGHT HIGH indicator light Receives height control switch/height control warning signal from suspension control ECU (CAN) Master caution indicator light Receives warning signal from each ECU (CAN) HINT: *1: except U.S.A. *2: w/ Cruise control system *3: w/ Dynamic radar cruise control system *4: for U.S.A. *5: w/ Pre-collision system
  2. MULTI-INFORMATION DISPLAY When the DISP switch is pressed, the multi-information display is changed between the following modes: standard mode, cruise information display mode, radar cruise mode, warning mode.
  3. MULTI-INFORMATION DISPLAY FLOWCHART Multi-information display flowchart Warning display flowchart The warning displays are automatically scrolled. The warning sound is emitted simultaneously with the warning display only when the warning first occurs. (Preparation delay is within 210 milliseconds.) When a warning first occurs, it is displayed as a new warning. When several warnings occur, each warning is displayed for 2 seconds. However, when a new warning is first displayed, the display lasts for 6 seconds. For the "Moon Roof Opened" and "To start, depress the brake pedal, and push the engine switch" symptoms, the ECUs of the respective systems cannot send signals with the engine switch on (IG). As a result, the meter cannot display information for these symptoms with the engine switch on (IG). Conditions for master warning illumination (for situations with several warning displays). The master warning blinks or illuminates according to the highest priority warning. Even if each individual warning would not cause the master warning to illuminate, the cyclic display causes the master warning to illuminate. Even if a warning has its own indicator, the warning is still cycled in the multi-information display. Outside temperature and driving monitor display flowchart HINT: *: As there is no designated screen for this vehicle, this screen is skipped. Door warning display flowchart

FAIL-SAFE CHART

Engine coolant temperature gauge

ConditionFail-safe OperationFail-safe Deactivation Condition
Engine coolant temperature data is interrupted for 3.1 secondsGauge needle indicates below "C"Engine coolant temperature data is received

FAIL-SAFE CHART

Fuel signal (Fuel injection signal)

ConditionFail-safe OperationFail-safe Deactivation Condition
While engine switch is in on (IG) position, fuel injection signal is interrupted for 60 secondsFuel gauge calibration is performed using average fuel consumption dataEngine switch is turned from off to on (IG) and normal data is received

FAIL-SAFE CHART

Fuel signal (Gauge signal)

ConditionFail-safe OperationFail-safe Deactivation Condition
While engine switch is in on (IG) position, sender signal is interrupted for 60 seconds and malfunction signal is received from one of the gauges for 10 to 20 secondsNeedle indicates "E", and warning light comes onEngine switch is turned from off to on (IG) and normal data is received

FAIL-SAFE CHART

Odometer

ConditionFail-safe OperationFail-safe Deactivation Condition
Vehicle speed pulse signal integration value is interrupted for 0.12 secondData received most recently remains displayedNormal data is received

FAIL-SAFE CHART

A/T shift position indicator

ConditionFail-safe OperationFail-safe Deactivation Condition
"P to D" data is interrupted for 3.1 secondsAll data can be displayed: Shift position comes on All data can not be displayed: Shift position indicator goes offNormal data is received
"P" to "D" data is interruptedData received most recently remains displayed (when data is interrupted for 3.1 seconds, shift position indicator goes off)Normal data is received

FAIL-SAFE CHART

Sports shift position indicator

ConditionFail-safe OperationFail-safe Deactivation Condition
Gear position signal is interruptedData received most recently remains displayed (when data is interrupted for 3.1 seconds, shift position indicator goes off)Normal data is received
Sports mode indicator and sports mode enable signals are interruptedData received most recently remains displayed (when data is interrupted for 3.1 seconds, shift position indicator goes off)Normal data is received

FAIL-SAFE CHART

SRS warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
While engine switch is in on (IG) position, SRS warning light on/blink request signal (9.0 V or higher) is interrupted for 10 seconds or SRS warning light on/blink request signal (below 9 V) is interrupted for 60 secondsSRS warning light comes on until engine switch offNormal data is received

FAIL-SAFE CHART

ABS warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
While engine switch is in on (IG) position, ABS warning light signal is interrupted for 1 secondABS warning light comes on until engine switch offNormal data is received

FAIL-SAFE CHART

BEAM indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
Headlight HI on instruction signal is interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: BEAM indicator light condition is maintained Engine switch is off: BEAM indicator light is offNormal data is received

FAIL-SAFE CHART

Brake warning light/Yellow (Minor malfunction)

ConditionFail-safe OperationFail-safe Deactivation Condition
Brake warning light/yellow (minor malfunction) signal, brake level warning light and PKB switch signals are interrupted for 1 secondBrake warning light/yellow (minor malfunction) comes on until engine switch offNormal data is received

FAIL-SAFE CHART

CRUISE main indicator light (w/ Cruise control system, Dynamic radar cruise control system)

ConditionFail-safe OperationFail-safe Deactivation Condition
CRUISE activate indicator, cruise control warning and radar cruise warning signals are interruptedDisplay condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

Driver side seat belt warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
Driver side seat belt buckle switch signal is interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: Driver side seat belt warning light condition is maintained Engine switch is off: Driver side seat belt warning light is offNormal data is received

FAIL-SAFE CHART

DOOR indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
Driver side courtesy switch, front passenger side courtesy switch, rear door LH courtesy switch, rear door RH courtesy switch and luggage courtesy switch signals are interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: DOOR indicator light condition is maintained Engine switch is off: DOOR indicator light is offNormal data is received

FAIL-SAFE CHART

Brake warning light/Red (Malfunction)

ConditionFail-safe OperationFail-safe Deactivation Condition
Brake warning light/red (malfunction) signal is interruptedBrake warning light/red (malfunction) condition is maintained until engine switch offNormal data is received
While engine switch is on (IG) position, electro-mechanical parking brake warning light signal is interrupted for 1 secondElectro-mechanical parking brake warning light comes on until engine switch offNormal data is received

FAIL-SAFE CHART

Fr FOG indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
Front fog light on signal is interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: Fr FOG indicator light condition is maintained Engine switch is off: Fr FOG indicator light is offNormal data is received

FAIL-SAFE CHART

Rr FOG indicator light (for Except U.S.A.)

ConditionFail-safe OperationFail-safe Deactivation Condition
Rear fog light on signal is interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: Rr FOG indicator light condition is maintained Engine switch is off: Rr FOG indicator light is offNormal data is received

FAIL-SAFE CHART

HEAD indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
Headlight LO on instruct signal is interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: HEAD indicator light condition is maintained Engine switch is off: HEAD indicator light is offNormal data is received

FAIL-SAFE CHART

HEIGHT HIGH indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
HI light signal is interruptedHEIGHT HIGH indicator light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

Front passenger side seat belt warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
Passenger side seat belt buckle switch, passenger side seat occupied/unoccupied signals are interruptedFront passenger side seat belt warning light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

ECT POWER indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
ECT PWR indicator signal is interruptedECT POWER indicator light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

SLIP indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
Frame data (including SLIP indicator on/blink request signal) is interrupted for 0.9 secondsSLIP indicator light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

ECT SNOW indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
ECT SNOW indicator signal is interruptedECT SNOW indicator light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

TAIL indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
Taillight on instruct signal is interrupted for 10 seconds during CAN bus wake-up modeWhile engine switch is in on (IG) position: TAIL indicator light condition is maintained Engine switch is off: TAIL indicator light is offNormal data is received

FAIL-SAFE CHART

Tire pressure warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
While engine switch is on (IG) position, tire pressure warning signals are interruptedWhile engine switch is in on (IG) position: Tire pressure warning light blinks for 60 to 64 seconds Engine switch is off: Tire pressure warning light is offNormal data is received

FAIL-SAFE CHART

AFS OFF indicator light

ConditionFail-safe OperationFail-safe Deactivation Condition
AFS OFF indicator on request signal is interruptedAFS OFF indicator light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART

PARK warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
Communication data from electro-mechanical parking brake ECU is interrupted for 1 secondWhile engine switch is in on (IG) position: PARK warning light condition is maintained Engine switch is off: PARK warning light is offNormal data is received

FAIL-SAFE CHART

EPS warning light

ConditionFail-safe OperationFail-safe Deactivation Condition
EPS warning light signal is interrupted for 1 secondEPS warning light condition is maintained until engine switch offNormal data is received

FAIL-SAFE CHART