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Home >> Lexus >> 2011 >> GS 350 AWD >> Repair and Diagnosis >> Steering >> Power Steering >> Power Steering System (Diagnostics - Introduction) >> Power Steering System >> System Diagram >> System Diagram
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System Diagram

Fig 1: Electronic Power Steering System Diagram (1 Of 2)
GTY106697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Electronic Power Steering System Diagram (2 Of 2)
GTY106711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Transmitting ECU
(transmitter)		 Receiving ECU Signals Communication method
ECM Power Steering ECU Assembly T/M variation information signal CAN
ECM Power Steering ECU Assembly Engine speed signal CAN
ECM Power Steering ECU Assembly Ambient temperature signal CAN
ECM Power Steering ECU Assembly Intake air temperature signal CAN
ECM Power Steering ECU Assembly Engine variation information signal CAN
ECM Power Steering ECU Assembly Vehicle destination information signal CAN
Skid Control ECU Power Steering ECU Assembly Output command value (to EPS) signal CAN
Skid Control ECU Power Steering ECU Assembly Additional torque target signal CAN
Skid Control ECU Power Steering ECU Assembly Vehicle speed (SP1) status signal CAN
Skid Control ECU Power Steering ECU Assembly Target steering angle and additional torque valid signal CAN
Skid Control ECU Power Steering ECU Assembly Vehicle speed (SP1) signal CAN
Skid Control ECU Power Steering ECU Assembly Test mode signal CAN
Skid Control ECU Power Steering ECU Assembly VSC controlling signal CAN
Skid Control ECU Power Steering ECU Assembly ABS controlling signal CAN
Steering Angle Sensor Power Steering ECU Assembly Data continuity (valid/invalid) signal CAN
Steering Angle Sensor Power Steering ECU Assembly +B open circuit signal CAN
Steering Angle Sensor Power Steering ECU Assembly Sensor malfunction signal CAN
Steering Angle Sensor Power Steering ECU Assembly Steering angle signal CAN
Steering Angle Sensor Power Steering ECU Assembly Zero point memory (in sensor) valid/invalid signal CAN
Steering Angle Sensor Power Steering ECU Assembly Zero point (stored in steering angle sensor) signal CAN
Cowl Side J/B RH ECU
(Body ECU)		 Power Steering ECU Assembly Vehicle model signal BEAN, CAN
Power Steering ECU Assembly Skid Control ECU EPS pinion angle invalid signal CAN
Power Steering ECU Assembly Skid Control ECU EPS assisting current invalid signal CAN
Power Steering ECU Assembly Skid Control ECU EPS torque sensor value invalid signal CAN
Power Steering ECU Assembly ECM EPS idle up request signal CAN
Power Steering ECU Assembly Skid Control ECU EPS torque sensor value signal CAN
Power Steering ECU Assembly Skid Control ECU EPS pinion angle signal CAN
Power Steering ECU Assembly Skid Control ECU EPS assisting current signal CAN
Power Steering ECU Assembly Combination Meter EPS light ON request signal BEAN, CAN
Power Steering ECU Assembly Combination Meter EPS diagnostic information signal BEAN, CAN
1UR-FSE:

Transmitting ECU
(transmitter)		 Receiving ECU Signals Communication method
Absorber Control ECU Power Steering ECU Assembly Damping force control mode signal (normal mode or sports mode) CAN
Skid Control ECU Power Steering ECU Assembly Target steering angle signal CAN
Skid Control ECU Power Steering ECU Assembly VDIM control permit status signal CAN
Skid Control ECU Power Steering ECU Assembly Target relative angle 2 signal CAN
Skid Control ECU Power Steering ECU Assembly Target momentary gear ratio signal CAN
Skid Control ECU Power Steering ECU Assembly Automatic reverse steering controlling signal CAN
Skid Control ECU Power Steering ECU Assembly Reverse steering controlling signal (*1) CAN
Skid Control ECU Power Steering ECU Assembly Momentary gear ratio controlling signal CAN
Skid Control ECU Power Steering ECU Assembly Braking force moment signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS fail signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS cooperative control permit signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS data output response signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS relative angle signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS relative angular velocity signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS relative angle invalid signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS target turning angle sensor signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS communication distinction information signal CAN
Steering Control ECU Power Steering ECU Assembly VGRS warning light signal CAN
Power Steering ECU Assembly Skid control ECU
Steering Control ECU		 EPS cooperative control permit signal CAN
Power Steering ECU Assembly Skid control ECU VGRS detection signal CAN
Power Steering ECU Assembly ECM VGRS detection signal CAN
Power Steering ECU Assembly Skid control ECU
Absorber Control ECU		 EPS pinion angle invalid signal CAN
Power Steering ECU Assembly Skid control ECU
Absorber Control ECU		 EPS assisting current invalid signal CAN
Power Steering ECU Assembly Skid control ECU
Absorber Control ECU		 EPS torque sensor value invalid signal CAN
Power Steering ECU Assembly Skid control ECU
Absorber Control ECU		 EPS torque sensor signal CAN
Power Steering ECU Assembly Skid control ECU
Absorber Control ECU		 EPS pinion angle signal CAN
Power Steering ECU Assembly Steering Control ECU EPS assisting current signal CAN

*1: Transmitted when the vehicle detects different levels of friction between the tires and road surface due to road conditions.

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