4: Front Airbag Sensors

R50, R52, R53
Front Airbag Sensors

Installation location
The 2 front airbag sensors are installed on the side members.

Side Member:

Key Explanation Key Explanation
1 Front airbag sensor
2 Side member
3 Bulkhead

Construction
The front airbag sensor comprises the following components:
- Longitudinal acceleration sensor (for detecting head-on and rear-end collisions)
- Electronic module (for signal processing and data transmission)

The left and right-hand front airbag sensors are identical.

How it works
The longitudinal acceleration sensor detects a head-on or rear-end collision.
The signals from the longitudinal acceleration sensor are digitally processed in the electronic module. The electronic module does not analyse the data, but sends a message to the MRS control unit on a cyclical basis.
The message is analysed in the MRS control unit.
The longitudinal acceleration sensor measures both acceleration and deceleration. This allows it to distinguish between a head-on collision (deceleration) and a rear-end collision (acceleration).