Warning signs that your BMW or Rolls-Royce Theft Control Module might be failing include:
- The car alarm goes off randomly.
- The car won't start, even with a good battery.
- The remote key fob doesn't work to lock or unlock the doors.
- You see a security warning light on the dashboard.
- The car's immobilizer system is active, preventing the engine from running.
To test if the Theft Control Module is the problem, a mechanic will usually:
- Check the battery voltage and connections.
- Scan the car's computer for error codes related to the security system.
- Test the key fob signal.
- Inspect the wiring harness connected to the module for damage.
- Sometimes, they might temporarily bypass the module to see if the car starts.
Common reasons why these modules fail are:
- Water damage or corrosion.
- Electrical surges or shorts.
- Age and wear.
- Problems with the car's wiring harness.
- Physical damage from an accident.
