Airbag control unit with part number 15887042 SK

What is the function of the Airbag Control Unit 15887042 SK?

The Airbag Control Unit 15887042 SK is the central control module of the Supplemental Restraint System (SRS) in certain Pontiac and Saturn models. It processes data from acceleration and crash sensors and, within milliseconds, determines whether and which restraint systems—such as airbags or seatbelt pretensioners—should be deployed.

As an SRS control unit, it is responsible for monitoring all safety‑related components. It continuously performs self‑tests to ensure the system operates flawlessly in the event of a crash. Upon detecting faults, it illuminates the airbag warning light on the instrument panel to alert the driver.

This control unit is specifically tailored to the vehicle architecture of models like the Pontiac Solstice and Saturn Sky and communicates via the CAN bus with other ECUs in the vehicle to ensure a coordinated safety response.

Why does the 15887042 SK control unit fail?

The most common cause of failure for the 15887042 SK control unit is the storage of crash data after an accident, which results in the system being locked out. In addition, internal electronic malfunctions, water damage, or issues with the power supply can lead to total or partial failure of the module.

After a crash, crash data is permanently stored in the unit’s memory. This lockout is intentionally designed by the manufacturer to prevent reuse without professional inspection and reset (crash reset). Once locked, the airbag warning light remains illuminated.

Internal electronic defects are another frequent source of failure. These include damaged SMD components, faulty voltage regulators, capacitors, or MOSFETs. Corrosion at the CAN bus connectors, broken pins, short circuits, or reverse polarity during jump-starting can also irreparably damage the sensitive electronics.

The part number 15887042 SK belongs to a hardware family that includes compatible numbers such as 15774620, 15838918 SL, or 25865978. The fault patterns across these units are often identical, as they share a similar technical platform.

How do you recognize a defect in the 15887042 SK?

A defect in the 15887042 SK control unit primarily manifests as the airbag or SRS warning light remaining constantly illuminated in the cockpit. Additionally, the control unit may become unresponsive during diagnostics, failing to communicate with the workshop diagnostic tool.

The most obvious symptom is the persistently lit airbag warning light. It does not extinguish after starting the vehicle, indicating a serious fault stored in the system.

During workshop diagnostics, specific fault codes are read. Typical codes include U1XXX (communication errors), B1XXX (internal system faults), or manufacturer‑specific codes such as FC1, which directly point to an internal malfunction of the control unit.

Another clear sign is complete loss of communication. When attempting to access the airbag control unit via a diagnostic device, the connection fails. The unit no longer responds to requests, often signaling a severe internal hardware failure.

In which vehicles is the 15887042 SK installed?

The airbag control unit with part number 15887042 SK is found in sporty roadster and coupe models from General Motors’ Pontiac and Saturn brands dating back to the late 2000s. At Airbag24, we repair this control unit for the specific vehicle models listed here.

At Airbag24, the 15887042 SK control unit is refurbished for the following models:

Pontiac:

- Pontiac Solstice Roadster (2005–2009)

- Pontiac Solstice Coupe (2005–2009)

Saturn:

- Saturn Sky Base (2006–2009)

- Saturn Sky Red Line (2006–2009)

How does the repair process work at Airbag24?

The repair process at Airbag24 begins with a thorough incoming inspection of the 15887042 SK control unit. Stored crash data is then reset, and any defective electronic components on the circuit board are replaced. A final functional test ensures full operational readiness.

Once the removed control unit arrives at Airbag24, our technicians perform a comprehensive diagnosis. All stored fault codes and crash data are read and documented to pinpoint the exact cause of the issue.

The next step involves professional repair, which includes carefully resetting the stored crash data to factory settings. Defective electronic components—such as capacitors, resistors, or processors—are identified and replaced with new, high‑quality parts. Removing corrosion damage and repairing circuit traces are also standard procedures.

After repair, the control unit undergoes a comprehensive functional test. Only once all tests have been successfully passed and the device is operating flawlessly will it be approved for return shipment. We provide 2 years' statutory liability for defects on every repair.