2003 BMW 745LiFACTORY OEM SERVICE PROCEDURE

Review Questions

  1. Why is it possible for the SIM to react faster than the previous MRS system?
  2. Where does the power supply (B+) to the satellites originate from? What happens to the power supply (B+) if a fault is logged in one of the satellites?
  3. Where is the system time for the ISIS system stored? What is this time used for?
  4. What two signals must be received by a satellite before a pyrotechnic actuator (airbag, seatbelt tensioner etc.) can be deployed? How do these signals arrive to the satellite?
  5. Which satellite is responsible for deploying the BST? What other actuators or devices does it control?
  6. When an AKS is deployed what components must be replaced?
  7. What function must be carried out when a new control module is fitted to the ISIS system?
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.

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