Bonnet lock

Bonnet locks in late-model BMWs aren’t a common mechanical issue—but we do frequently sell pyrotechnic bonnet locks for use in collision repairs.

Most modern BMWs are now fitted with pedestrian protection systems called ‘Active Hood’ or ‘Active Bonnet’.

These systems use sensors to preemptively detect a collision with a pedestrian, triggering pyrotechnic actuators located on the bonnet hinges (and sometimes bonnet locks) to raise the bonnet before impact. This creates a cushioning effect, and increases the distance between the hood and hard components in the engine bay, potentially reducing the severity of injuries to the pedestrian.

Once the pyrotechnic actuators are triggered they cannot be reused.

Most model generations will typically have only one variant of pyrotechnic bonnet lock for each side, but occasionally BMW introduces a new system mid-generation.

The best way to confirm fitment compatibility of these actuators is to match the BMW part numbers from the catalogue. This can be done by decoding your vehicle’s VIN in a BMW EPC (electronic part catalogue.)

If you don’t have access to an EPC, provide our team with your vehicle’s 17-digit VIN—and we’ll check our stock for a compatible match.

There is some interchangeability of pyrotechnic bonnet locks between vehicles.