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Contact roller

Contact roller


To distribute test and detonating current to the steering wheel airbag, there is a contact roller between the steering wheel and the steering wheel bracket. The contact roller also distributes current to the horn through two separate leads.

The contact roller consists of a fixed and a moving part. Between the fixed and the moving parts is a coiled plastic strip with four conductors molded into it.

The moving part of the contact roller (coil spring) can be rotated about 5 turns, i.e. about 2.5 turns in either direction from the centre position. If it is turned further the spiral strip will break, rendering the airbag system inoperative. This is detected by the control module and the warning lamps will come on.