Central Electronic Module (CEM) (2004-2011): Function: Horn

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Fig 1: Identifying Horn

Courtesy of VOLVO CARS OF NORTH AMERICA.

The horn (16/10-11) is operated when the steering wheel module (SWM) (3/254) receives a signal from the switches in the steering wheel. The steering wheel module (SWM) transmits information via a directly connected cable to the central electronic module (CEM) (4/56) indicating that the switch is closed. The central electronic module (CEM) activates the relay (2/17) for power supply to the horn.