B1916 airbag control unit fault

What does error code B1916 mean in the airbag control unit?

Error code B1916 indicates a specific issue within the airbag control unit, particularly affecting vehicles such as the Rover Freelander Adventurer. Typically, this code signals that irreversible crash data has been stored in the internal memory following an accident. This data prevents the system from functioning normally and cannot be erased using standard workshop diagnostic tools.

Technically, during an accident, a specific area of the control unit’s memory—often an EEPROM chip—is marked as ‘locked.’ This is a manufacturer‑imposed safety measure to ensure the system is inspected after a crash. Error B1916 is triggered when the system self‑test detects this permanent lock entry.

In some cases, the error code may also point to a communication fault. The control unit enters a protected mode and refuses to communicate with external diagnostic equipment, making troubleshooting more challenging. Less frequently, defects in internal components—such as the memory chip itself or the backup battery—may be responsible.

How can you recognize error B1916?

The most obvious symptom of error B1916 is a continuously illuminated or intermittently flashing airbag warning light on the instrument cluster. Often, the code stored in the fault memory cannot be cleared, and repeated communication failures occur between the diagnostic tool and the control unit.

The airbag warning light indicates a critical malfunction in the restraint system. This means that, in the event of another accident, the airbags and seatbelt pretensioners might not deploy correctly—or at all—posing a significant safety risk.

When attempting to read and clear the fault memory at a workshop, the command is rejected by the control unit. The diagnostic tool typically reports that the error cannot be erased, which strongly suggests the presence of stored crash data.

What causes error B1916?

The primary cause of error code B1916 is the storage of crash data in the airbag control unit after an accident. Other potential reasons include internal hardware defects, such as a faulty memory chip or a defective backup battery. Power supply issues, wiring problems, or an internal software glitch are also possible—but less common—causes.

Even minor collisions where the airbags did not deploy can result in the control unit storing crash data. This information remains permanent and serves to trigger a full system check.

A defect in internal components is another key factor. Over time, the memory chip may become unreliable, or the internal buffer battery responsible for maintaining certain data may lose its capacity. These internal malfunctions are interpreted as error B1916.

An unstable power supply or corrosion at the control unit’s connector terminals can likewise lead to data corruption and internal functional failures that trigger this error code.

Which vehicles experience error B1916?

Error code B1916 is highly specific and occurs primarily in vehicles manufactured by Rover. It is especially well‑known in the Rover Freelander Adventurer. While airbag control unit issues can arise across many brands, this particular error code is closely associated with this specific model. At Airbag24, we specialize in repairing these control units.

At Airbag24, we repair error code B1916 for the following model:

Rover: Freelander Adventurer

How is error B1916 repaired?

Professional repair of error B1916 begins with the careful removal of the airbag control unit from the vehicle. Upon receipt at Airbag24, an initial inspection is performed. Next, the stored crash data is erased at the chip level, and internal components—such as the memory chip or the backup battery—are examined and replaced if necessary. A final functionality test ensures full operational readiness.

Before removal, it is recommended to read the fault memory and back up the log to confirm that B1916 is indeed the root cause.

At Airbag24, repairs are carried out at the component level. Our technicians directly access the memory chip to safely remove the crash data. If analysis reveals additional defects—such as a faulty backup battery or memory chip—the affected parts are replaced with high‑quality genuine components to ensure long‑term reliability.

After repair, the control unit is tested on a specialized test bench to verify correct communication and flawless functionality. We provide 2 years' statutory liability for defects on all repairs.