Start Button

Fig 1: Locating Start Button

Courtesy of VOLVO CARS CORPORATION

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