2025 Alfa Romeo Tonale DASM Update for ACC/Highway Assist Faults

Owners of the 2025 Alfa Romeo Tonale may encounter issues with their vehicle's advanced driver-assistance systems. These problems, including specific warning messages and a Diagnostic Trouble Code (DTC) C1409-97, are linked to the Driver Assistant System Module (DASM) software. Technical Service Bulletin (TSB) 08-295-25, issued on September 4, 2025, outlines a procedure to update the DASM software to resolve these concerns.

This bulletin applies to 2025 Alfa Romeo Tonale vehicles built on or before June 30, 2025, specifically those equipped with Full Speed Fwd Collision Warn Plus (Sales Code LSU) for the North American market. The primary cause of these issues is identified as the DASM software.

Symptoms

Owners may notice a Malfunction Indicator Lamp (MIL) illumination on the dashboard. In addition to the warning light, the following specific messages or conditions may be experienced:

• "ACC not available" message displayed on the Instrument Panel Cluster (IPC).
• "Highway Assist not available" message displayed on the IPC.
• Highway Assist steering wheel vibration.

Fault Codes / DTCs

The presence of these symptoms is typically accompanied by a specific Diagnostic Trouble Code (DTC) stored in the vehicle's system:

Code	Description
C1409-97	Radar Sensor Blind Component or System Obstructed or Blocked

Diagnosis

To properly diagnose the issue, a technician will use a Scan Tool, such as wiTECH, along with the appropriate diagnostic procedures available in DealerCONNECT/Service Library. The technician will verify that all related systems are functioning correctly. If any DTCs or symptom conditions other than those listed in TSB 08-295-25 are present, they must be addressed before proceeding with the DASM software update. If the customer's concerns match the described symptoms, the repair procedure should be followed.

Important Warnings

Several critical warnings must be observed during the repair process to prevent damage and ensure a successful software update:

• "Do not allow the charging voltage to climb above 13.5 volts during the flash process." Maintaining the battery voltage between 13.2 and 13.5 volts is crucial.
• "If this flash process is interrupted/aborted, the flash should be restarted." Any interruption could lead to module corruption.
• "Removal of the Brake Booster Vacuum Pump fuse is necessary for this Repair Procedure. Failure to remove the 30 Amp fuse may result in damage to the Brake Booster Vacuum Pump." This step is essential to protect vehicle components.

Repair Procedure Summary

The repair involves updating the 2025 Alfa Romeo Tonale DASM software. Before beginning the software flash, technicians must inspect the front radar/fascia for any mud, dirt, or obstructions that could affect its function. Any aftermarket components that might interfere with the radar should be removed, and the fascia cleaned if necessary.

Next, a battery charger must be installed to maintain the vehicle's battery voltage between 13.2 and 13.5 volts throughout the process. A critical step is to remove the 30 Amp fuse for the Brake Booster Vacuum Pump from the Power Distribution Center (PDC) in the engine compartment. Following this, the Driver Assistant System Module (DASM) is reprogrammed using the latest available software via the wiTECH Diagnostic Application. After the software update, all Diagnostic Trouble Codes (DTCs) that may have been set during reprogramming must be cleared. Finally, the 30 Amp fuse for the Brake Booster Vacuum Pump is reinstalled.

Required Tools or Parts

• wiTECH Diagnostic Application
• Battery charger capable of maintaining 13.2-13.5 volts

Owner Action

If your 2025 Alfa Romeo Tonale exhibits the symptoms described, such as the "ACC not available" or "Highway Assist not available" messages, or if you suspect an issue with your 2025 Alfa Romeo Tonale DASM software, it is recommended to schedule an appointment with an authorized Alfa Romeo dealership. The repair, identified by Labor Operation Number 18-80-95-9B, involves a software update and is reimbursable under the provisions of the warranty. The estimated labor time for this procedure is 0.3 hours.

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Source: NHTSA ID: 11023068