2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

RAS Function

WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
RAS FUNCTION TABLE

Part name Function
RAS control unit
  • Calculate the vehicle speed signal from CAN communication and the signals from steering angle sensor and rear wheel steering angle sensor by a computer, and then control the rear wheel steering angle.
  • Fail-safe function is activated when the electrical system is malfunctioning. The output signal to the actuator is turned OFF during this mode. At that time, the RAS warning lamp illuminates and indicates the system is malfunctioning.
  • It performs the communication control function with other control units via CAN communication.
  • This enables system diagnosis with CONSULT-II.
RAS actuator The efficiency of the rear wheel steer improves by locating the electric motor actuator into the lower link of rear suspension.
Steering angle sensor
  • Measure the steering angle and send it to RAS control unit via CAN communication.
  • It is shared with the steering angle sensor for VDC.
Rear wheel steering angle sensor
  • It sends the rear wheel steering angle status to RAS control unit. The accuracy of rear wheel steer improves by comparing the vehicle speed signal from CAN communication with the rear wheel steering angle target value calculated from the wheel angle sensor signal, and it controls them.
  • There are 2 types of rear wheel steering angle sensors (main/sub). If one of them is malfunctioning, the other operates the fail-safe mode and stops the control.
RAS warning lamp
  • It turns on when the fail-safe function is operated and indicates that a RAS control malfunction has occurred.
  • It turns on when ignition switch turns on and turns off after the engine is started.
  • It indicates the suspect system by blinking when performing the self-diagnosis (without CONSULT-II).
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.