Aftermarket Radio Unit

The design consists of a signal input and four signal outputs on the accessory electronic module (AEM).

The input signal is an analogue +12V mute signal, from either the reverse warning system or the non-integrated hands free system.

Two output signal are pulse width modulated signals for the lighting rheostat signal position and the speed sensitive volume signal.

One output signal is a digital 12V mute signal to the radio unit.

One output signal is a +30 supply for an external aerial amplifier.

When installing an after market radio unit, the car must be configured using new software. Configuration is carried out via VIDA (Volvo scan tool).

Information regarding which production plant a car is manufactured in can be found in the VIN number. The seventh position from the right in the VIN specifies the production plant.

There are diagnostics for the system.