B1BD0 - Internal rollover sensor fault airbag control unit fault

What does error code B1BD0 mean in the airbag control unit?

Error code B1BD0 reports an internal fault in the rollover sensor at Lancia, and the airbag control unit stores this fault in the fault memory. The rollover sensor is therefore the affected component, as part of the restraint system (SRS), so it is a component that helps protect the occupants, and the airbag warning light comes on.

The rollover sensor is a sensor in the restraint system. If the control unit reports an internal fault in this sensor, the entry remains in the fault memory until the fault has been read out and resolved.

How do you recognise error code B1BD0?

Error code B1BD0 shows itself when the airbag warning light stays on permanently and the code is stored in the fault memory. The code cannot be permanently cleared, because the internal fault in the rollover sensor is still present. It is read out with a diagnostic tool that retrieves the fault memory.

As long as the fault is stored, the airbag warning light stays switched on. Whether the fault lies in the sensor itself or in the control unit is only shown by reading it out with the diagnostic tool and the subsequent inspection.

What causes error code B1BD0?

At Lancia, an internal fault in the rollover sensor can arise from crash data after an accident, from ageing electronic components, solder joints or moisture. Connectors, cables, the control unit itself and voltage spikes caused by a weak battery or jump-starting are also possible causes.

• Crash data after an accident
• Ageing electronic components in the rollover sensor
• Solder joints in the rollover sensor or the control unit
• Moisture or corrosion at the connections
• Voltage spikes caused by a weak battery or jump-starting

Whether the sensor itself or the control unit is the cause can only be established after the fault memory has been read out and the inspection carried out.

In which vehicles does error code B1BD0 occur?

Error code B1BD0 is known for Lancia vehicles, namely the Lancia Flavia JS and Lancia Thema LD models. The meaning of this code has not yet been recorded for other makes, and the information is limited to the Lancia make.

The meaning may differ for other vehicles, and the list is not complete. Only reading out the fault memory with a diagnostic tool shows whether a particular vehicle is affected.

How is error code B1BD0 resolved?

First have the fault memory read out with a diagnostic tool. Afterwards, have the rollover sensor, connectors and cables checked at a specialist workshop, because these parts may be the cause. If the cause lies in the control unit, create a repair order online and send in the unit.

Disconnect the battery before removing the control unit. Only after that is the control unit removed.

Checking, repairing and testing usually take 3–4 working days. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required. Work on the airbag system should be left to qualified specialists.