Radio/Audio System Circuit Description. Chevrolet PJJ 2000

For 1990-2009 cars

### Radio

The radio receives battery voltage at all times through the RDO/LAMPS fuse to keep the clock and preset station memory alive when the ignition switch is off. With the ignition switch in the accessory or on position, voltage is applied through the Body Control Module to enable radio operation. The radio is grounded through the radio ground circuit. When the ignition switch is in the accessory or on position, the Vacuum Fluorescent (VF) display illuminates to display the time or radio frequency setting.

### Compact Disc (CD) and Cassette Player

If equipped, the Compact Disc (CD) or cassette player is part of the radio unit. When operating, the same power required by the radio is necessary for tape or CD player operation.