2012 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Component Description

Component Function
ABS actuator and electric unit (control unit) ABS operation signal is received from ABS actuator and electric unit (control unit) via CAN communication.
ADAS control unit Intelligent brake assistance operation signal is received from ADAS control unit via CAN communication.
Air bag diagnosis sensor unit
  • Detects a collision and supplies power supply for deployment to air bag module and pre-tensioner seat belt.
  • Performs the deploy judgement of passenger air bag based on the information from Occupant Detection System control unit
BCM Ignition ON signal, sleep/wake up signal, and door switch signal are received from BCM via CAN communication.
Brake pedal stroke sensor
  • It changes voltage according to brake pedal depressed amount and sends the signal to pre-crash seat belt control unit.
  • There are 2 signals (brake pedal stroke sensor 1 and 2) sent from the brake pedal stroke sensor. Pre-crash seat belt control unit judges the stroke amount and the speed of the brake pedal according to the voltage of the signal sent by each side.
Combination meter
  • Transmits vehicle speed signal to pre-crash seat belt control unit (driver side).
  • Turns the seat belt warning lamp ON when the seat belt is unfastened.
Occupant detection system control unit Judges the passenger seat condition based on the information from occupant detection unit.
Pre-crush seat belt control unit (driver side)
  • Total control of pre-crash seat belt system is operated according to transmit signal.
  • Driver seat belt retractor integrates pre-crash seat belt control unit (driver side), driver seat belt motor, and tension reducer.
  • Seat belt motor operates each operation of pull, return, and hold.
Pre-crush seat belt control unit (passenger side)
  • Control of passenger pre-crash seat belt is operated according to transmit signal.
  • Passenger seat belt retractor integrates pre-crash seat belt control unit (driver seat), driver seat belt motor, and tension reducer.
  • Seat belt motor operates each operation of pull, return, and hold.
Seat belt buckle switch (driver side)
  • Fastening or not fastening of seat belt is judged. This judgment is used for control of driver pre-crash seat belt system.
  • Seat belt warning lamp on combination meter turns ON when seat belt is not fastened while ignition switch is ON.
  • The seat belt buckle switch is installed in the seat belt buckle.
Seat belt buckle switch (passenger side)
  • Fastening or not fastening of seat belt is judged. This judgment is used to control passenger pre-crash seat belt system.
  • The seat belt buckle switch is installed in the seat belt buckle.
Steering angle sensor Steering angle sensor signal, steering angle speed signal, steering angle sensor neutral position adjustment completion signal, and steering angle sensor malfunction signal are received via CAN communication.
Factory Service Tools

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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.