2025 BMW Convertible Alarm System Malfunction SIB 65 04 26

Owners of certain 2025 BMW Convertible models may encounter issues with their vehicle's alarm system, as detailed in BMW Service Information Bulletin SIB 65 04 26. This bulletin addresses various symptoms indicating a BMW Convertible alarm malfunction, providing a specific procedure to resolve these concerns.

Symptoms of Alarm System Malfunction

Customers may report several issues indicating a BMW Convertible alarm malfunction. These can include:

• "Missing confirmation sound" (the function cannot be selected or deselected in the Central Information Display (CID) menu).
• The alarm system is deactivated, often indicated by the interior mirror light remaining off.
• The alarm does not function at all.
• The DWA LED (anti-theft alarm system indicator) is without function after locking, meaning it does not flash.
• "Acoustic acknowledgement is unavailable" or cannot be enabled/disabled via the CID menu under doors/windows.
• The "Tilt alarm sensor 'SINE' cannot be reached via diagnostics."

Diagnosis and Trigger Conditions

If the tilt alarm sensor, designated as "SINE," cannot be accessed or communicated with through diagnostic tools, it is a strong indicator of the alarm system issue. This condition, along with the other reported symptoms, points to a potential fault in the alarm system's functionality.

Repair Procedure Summary

BMW recommends a specific procedure to reset the Siren and tilt alarm sensor (SINE) to correct the alarm system malfunction. This involves:

1. Accessing the luggage compartment: First, remove the flap from the luggage compartment wheel arch trim panel on the right side of the vehicle.
2. Fuse removal and reinstallation: Locate and remove the 5A fuse labeled F244 from the rear power distribution box. After waiting for approximately 10 seconds, re-install the fuse.
3. System reset: Following the fuse reinstallation, the alarm system Siren and tilt alarm sensor should reset.
4. Further diagnosis: If the alarm system's functionality is not restored after this procedure, technicians should proceed with further diagnosis using the ISTA system.

This repair is categorized as "MOBILE FRIENDLY," meaning it can be performed outside of a traditional workshop setting if necessary.

Important Warnings for Owners

• Parts Replacement Not Recommended: BMW explicitly states that a parts exchange will not provide a solution for this specific alarm system malfunction. Owners should be aware that replacing components will not resolve the underlying issue.
• Software Solution in Development: A software solution for this issue is currently in development. This suggests that while the fuse reset is a temporary fix, a more permanent software update may be released in the future.

Owner Action

If you are experiencing a BMW Convertible alarm malfunction with any of the described symptoms, it is recommended to visit an authorized BMW service center. The repair, identified by Repair Code 6575401500 (Horn / emergency current siren / antitheft tilt alarm sensor (DWA) Permanent malfunction), is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks. The specific labor operation for performing the fuse reset is 61 99 000.

Source: NHTSA ID: 11030310