Airbag control unit with part number 15107555

What is the function of Airbag Control Unit 15107555?

The airbag control unit with part number 15107555 is the central SRS module (Supplemental Restraint System) for the Saturn Relay 1 (model years 2004–2008). It processes signals from crash sensors, deploys airbags and seatbelt pretensioners in the event of a collision, and then stores crash‑related data, which results in deactivation of the system.

As a core component of the passive safety system, this control unit continuously monitors all connected sensors and actuators, such as seat‑occupancy detection mats, seatbelt pretensioners, and the airbag modules themselves. It is a specific part designed for the GM platform on which the Saturn Relay is based and closely related to models like the Chevrolet Uplander or Pontiac Montana.

A technical feature of GM control units of this generation is the permanent storage of crash data after deployment. The module locks itself to prevent reuse without professional inspection and repair. This lockout is the most common reason for requiring a repair.

Why does control unit 15107555 fail?

The most frequent cause of failure for control unit 15107555 is the storage of crash data following an accident, which causes the module to self‑lock. Other causes include internal electronic faults indicated by error codes such as 65535 (control unit defective), as well as communication issues via the CAN bus or peripheral problems like cable breaks.

After an airbag deployment, so‑called crash data are recorded in the control unit’s internal memory. This process is intentionally designed by the manufacturer and leads to permanent deactivation of the entire airbag system, signaled by the SRS warning light. The unit is then marked as “exhausted” and must be professionally reset.

Independent of accidents, internal hardware defects can also occur. These include cold solder joints, faulty memory chips (EEPROM), or damaged capacitors. Such defects often result in internal errors logged in the fault memory or complete loss of communication with diagnostic equipment.

Rarer causes are external influences, such as overvoltage in the vehicle’s electrical system or physical damage to cables and connectors—especially in the area beneath the front seats, where connections to sensors like the seat‑occupancy mat frequently run.

How do you recognize a defect in Airbag Control Unit 15107555?

The clearest symptom of a defect in control unit 15107555 is a permanently illuminated or flashing airbag warning light (SRS lamp) in the instrument cluster. Often, diagnostics tools can no longer communicate with the control unit, or specific error codes such as 65535 (internal error) are read out.

The active SRS warning light is more than just an indicator; it signals that the entire restraint system has been deactivated. In the event of another collision, airbags and seatbelt pretensioners would not deploy, posing a significant safety risk.

Another clear sign is the inability to perform diagnostics. When a workshop attempts to read the fault memory, the diagnostic tool reports “no communication” or “control unit unresponsive.” This points to a serious internal fault.

Specific error codes directly linked to the control unit are also a reliable indication. Code 65535 is a common sign of an irreparable internal defect, making repair or replacement of the module unavoidable.

In which vehicles is control unit 15107555 installed?

The airbag control unit with part number 15107555 is specific to the U.S. market and was primarily used in General Motors (GM) vehicles. At Airbag24, we specialize in repairing this module, particularly for first‑generation Saturn Relay minivans.

Specifically, this control unit is found in the following model:

Saturn Relay 1 (model years 2004–2008)

Since the Saturn Relay is built on a GM platform also shared with other models like the Chevrolet Uplander or Pontiac Montana SV6, the technical principles and repair methods for control units from these vehicles are often transferable. However, verifying the exact part number remains crucial before any repair.

How is control unit 15107555 professionally repaired?

Professional repair of control unit 15107555 at Airbag24 includes diagnosing the fault memory, precisely erasing stored crash data, and addressing any underlying electronic defects. The module is then thoroughly tested to restore full functionality and ensure a plug‑and‑play solution.

After being sent to Airbag24, the control unit undergoes a standardized process. First, an initial inspection is performed, during which the fault memory is read out to identify the exact cause of the defect—whether it’s an internal hardware failure or stored crash data.

The core of the repair is resetting the internal memory to factory settings using specialized software. This ensures that all crash data is completely and thoroughly erased. If electronic components such as capacitors, memory chips, or solder joints are damaged, they are professionally replaced or resoldered.

Since GM modules are often tied to the Vehicle Identification Number (VIN), repairing the original part is the best solution. It eliminates the need for time-consuming re-coding that would be required with a used replacement part. We offer 2 years' statutory liability for defects on all repairs.