2024-2025 Alfa Romeo Tonale / Dodge Hornet Alarm Siren Not Functioning

Owners of certain 2024-2025 Alfa Romeo Tonale and Dodge Hornet vehicles might encounter an issue where the vehicle's alarm siren does not function. This problem is often accompanied by a specific diagnostic trouble code (DTC) that points to a component failure within the alarm system. This technical service bulletin, S2508000016, provides guidance for technicians to diagnose and resolve this issue, specifically addressing the "Alarm Siren Does Not Function" symptom, which can affect the 2025 Alfa Romeo Tonale alarm siren. This communication was released in February 2025.

Symptoms

The primary symptom reported by owners is that the vehicle's siren is not working, leading to the general complaint that the "Alarm Siren Does Not Function." When a technician investigates this complaint, they typically find that the Body Control Module (BCM) has set a Diagnostic Trouble Code (DTC) indicating a problem with the alarm siren system. This directly relates to the 2025 Alfa Romeo Tonale alarm siren issue.

Fault Codes / DTCs

When the alarm siren is not functioning, technicians will likely observe the following Diagnostic Trouble Code (DTC) stored in the Body Control Module (BCM):

• U1412-09: Alarm Siren Unit (ASU) Component Failure

This code specifically points to an issue with the alarm siren unit itself, often triggered by electrical connectivity problems, and is a key indicator for the "Alarm Siren Does Not Function" condition.

Diagnosis / Trigger Conditions

The root cause of the "Alarm Siren Does Not Function" symptom and the associated DTC U1412-09 is often an improperly seated connector at the siren unit. This poor connection can prevent the siren from operating correctly. Additionally, a loose or improperly seated fuse F090, located at the Body Control Module (BCM), can also contribute to this issue. Technicians are advised to inspect these areas as part of their diagnostic process.

Repair Procedure Summary

To address the "Alarm Siren Does Not Function" condition and clear DTC U1412-09, manufacturer communication S2508000016 outlines a specific repair procedure:

1. Inspect the Siren Connector: Technicians should first inspect the electrical connector directly at the alarm siren unit for any signs of improper seating or damage. The document specifically references the "Hornet black 3-way connector D5907A" as an example.
2. Disconnect and Reconnect: The involved connector at the siren should be disconnected and then reconnected securely. This action helps to ensure a proper electrical contact.
3. Secure the Connector: After reconnecting, verify that the connector is firmly seated and secured to prevent future disconnections.
4. Check Fuse F090: Ensure that fuse F090, located at the Body Control Module (BCM), is securely in place. A loose fuse can interrupt power to the siren.
5. Retest Operation: After performing the above steps, retest the alarm siren's operation to confirm the issue is resolved.
6. Further Diagnostics: If the DTC U1412-09 remains active after these steps, technicians are directed to continue with the service diagnostics available within the Service Library (SL). This includes referring to Figure 1 and Figure 2 provided in the communication for detailed wiring and component location information.

Visual Aids and Diagrams

Manufacturer communication S2508000016 includes two figures to assist technicians with diagnosis and repair:

• Figure 1: VEHICLE THEFT SECURITY SYSTEM This diagram provides a detailed wiring schematic for the vehicle's theft security system, illustrating the connections between the siren, the Body Control Module (BCM), and related components like the hood ajar switch and various fuses (e.g., F36, F090). It helps technicians trace the electrical path and identify potential points of failure.
• Figure 2: This figure shows an example of the "Hornet black 3-way connector D5907A" and its general location within the Dodge Hornet (GG) vehicle, aiding in the physical inspection and manipulation of the siren connector.

Important Warnings for Owners

It is crucial for owners to understand that this manufacturer communication, S2508000016, explicitly states: "This document does not authorize warranty repairs." This means that while the document provides diagnostic and repair guidance for the "Alarm Siren Does Not Function" issue, any associated repair costs may not be automatically covered under warranty. Owners should discuss potential costs and coverage with their dealership.

Owner Action

If you own a 2024-2025 Alfa Romeo Tonale or Dodge Hornet and experience your alarm siren not functioning, or if you suspect an issue related to the "Alarm Siren Does Not Function" or DTC U1412-09, it is recommended to schedule an appointment with your authorized dealership. They have access to the full manufacturer communication S2508000016 and the necessary diagnostic tools and procedures to properly inspect the siren connector, fuse F090, and perform any required repairs for your 2025 Alfa Romeo Tonale alarm siren.

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Source: NHTSA ID: S2508000016