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System Diagram

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pre-Collision Safety - System Diagram
G04020873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Communication table: 

COMMUNICATION CHART

Sender ECU Receiver Signal Line
Distance Control ECU Seat Belt Control ECU
  • Relative vehicle speed signal
  • Vehicle-to-vehicle distance signal
  • Seat belt operation signal
 CAN
Skid Control ECU with Actuator (3GR - FSE) Skid Control ECU (3UZ - FE) Seat Belt Control ECU
  • Master cylinder pressure signal
  • Seat belt operation signal
  • Sudden braking signal
  • VSC control signal
  • Brake oil pressure signal
  • Brake assist signal
 CAN
Airbag Sensor Assembly Center Seat Belt Control ECU
  • Buckle switch malfunction signal
  • Driver seat belt buckle switch signal
  • Passenger seat belt buckle switch signal
 BEAN - CAN
Seat Belt Control ECU Combination Meter
  • Pre-collision safety system malfunction signal
 CAN - BEAN
Distance Control ECU Skid Control ECU with Actuator (3GR - FSE) Skid Control ECU (3UZ - FE)
  • Brake assist standby signal
 CAN
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