Start Button

Courtesy of VOLVO CARS CORPORATION

The starter button has two switches, switch 1 and switch 2. Switch 1 is directly connected to Central electronic module (CEM), Keyless vehicle module (KVM), and Engine control module (ECM). Switch 2 is only directly connected to Central electronic module (CEM).

Both switches should close when starter button is pushed. It is enough for one switch in the starter button to be closed for the vehicle to start. If the signals from the switches show different status on the starter button a fault code is set in Central electronic module (CEM), and the function for autostart is lost.