Airbag control unit with part number 5WY79320

What is the function of Airbag Control Unit 5WY79320?

The airbag control unit with part number 5WY79320 is the central control module for the passive safety system (SRS) in the first-generation Chevrolet HHR. It is also known under the alternative numbers 25938061, 15839792, and 95160, and processes signals from crash sensors to precisely deploy airbags and seatbelt pretensioners in the event of a collision.

As the “brain” of the restraint system, this component continuously monitors all connected sensors and actuators, including the acceleration sensors at the front and sides of the vehicle, as well as the seatbelt pretensioners and individual airbag modules. Its task is to assess the severity of an impact within milliseconds and activate the appropriate safety systems.

Compatibility with part numbers 25938061, 15839792, and 95160 means these units are technically identical and perform the same function in the vehicle. Proper operation of this control unit is critical for occupant safety, since a malfunction will disable the entire airbag system.

Why does control unit 5WY79320 fail?

A failure of the airbag control unit 5WY79320 is usually caused by internal hardware defects. Common causes include stored crash data after an accident, damage from moisture or overvoltage, and wiring issues that lead to malfunctions in the electronic circuitry on the board. Error code B1000 directly indicates such an internal defect.

After a crash, the unit stores so‑called crash data—a safety measure that locks the control unit to prevent unintended deployment following the incident. This lock can only be resolved through specialized repair and resetting of the stored data.

Electronic faults are another frequent cause. Overvoltage in the vehicle’s electrical system—such as from jump-starting—or ingress of moisture can damage sensitive components on the circuit board. This often results in error code B1000, signaling an irreparable internal electronics failure and rendering the entire device inoperable.

External factors like broken wires or faulty connectors leading to the control unit can also cause malfunctions. Although the root cause lies outside the unit itself, it may result in secondary damage to internal electronics or complicate accurate diagnosis.

How do you recognize a fault in 5WY79320?

The most obvious symptom of a fault in control unit 5WY79320 is a lit or flashing SRS airbag warning light on the instrument cluster. Often, the fault memory cannot be read because communication with the diagnostic tool is impossible. A B1000 error code stored in the fault memory (control unit defective) confirms internal damage.

The persistently illuminated SRS warning light is the primary indicator, alerting the driver that the entire passive safety system has been deactivated. In the event of a crash, airbags and seatbelt pretensioners will not deploy, posing a significant safety risk.

Another clear sign is the lack of communication: when a specialist workshop attempts to read the fault memory, the diagnostic tool cannot establish a connection with the airbag control unit. The unit no longer responds to requests, making further troubleshooting impossible and pointing to a total failure of the internal electronics.

If error code B1000 is detected, the diagnosis is unequivocal. This code signifies that the control unit has identified an internal, non‑removable hardware fault. CAN bus errors may also occur if the unit disrupts communication within the vehicle network.

In which vehicles is control unit 5WY79320 installed?

The airbag control unit with part number 5WY79320, along with its mechanically identical counterparts 25938061, 15839792, and 95160, is specifically designed for the first-generation Chevrolet HHR. At Airbag24, we offer professional and reliable repair services for control units installed in this vehicle model.

At Airbag24, we repair the control unit for the following specific model:

Chevrolet HHR (1st generation, model years 2006–2011)

How does the repair of 5WY79320 proceed at Airbag24?

The repair process at Airbag24 is designed for maximum safety and efficiency. Upon receipt of the removed control unit, our technicians conduct a thorough diagnosis to verify the reported fault—such as error code B1000. Defective components on the circuit board are then expertly repaired or replaced, and any stored crash data is erased.

After submission to Airbag24, a detailed initial inspection takes place. Using specialized diagnostic tools, the fault memory is read and communication with the unit is tested to pinpoint the exact cause of the failure.

The actual repair is performed at the component level. Our mechatronics specialists address identified hardware defects through precise soldering and the replacement of faulty components. If crash data has been stored due to an accident, it is completely and securely erased, ensuring the control unit is fully functional again.

Upon completion of the repair, each control unit undergoes a rigorous functional test to guarantee flawless operation. Of course, you receive 2 years' statutory liability for defects on the completed repair.