Amplifier Interface

To respond quickly to audio input and control signals, the amplifier is ON in all vehicle power modes except OFF and CRANK Request. However, when the amplifier is asleep it still must allow chime functionality. The internal amplifier bridges are fully powered and unmuted when the amplifier receives the switched 12-volt input.

The radio provides a remote radio control signal circuit for overall muting of remote non-GMLAN amplifiers. The amplifier receives PWM signals on the circuit at varying duty cycle percentages for controlling the muted and unmuted functions of the amplifier. The audio mute function is disabled in the Pontiac Solstice, Saturn Sky and the Chevrolet HHR however the circuit still exists and can set a DTC.