The following components supply voltage to the radio at all times:
| • | The RDO BATT fuse 19 |
| • | CKT 340 (ORN) |
CKT 340 (ORN) provides voltage for the radio station and clock memory storage. Turn the ignition switch to the ACCY position or the RUN position in order to supply voltage to the radio through the RDO IGN fuse 24 and CKT 1301 (DK GRN). CKT 1050 (BLK) provides the ground path to G203 and G204.
When the headlamp switch is in the PARK position or the HEAD position via the following components, the radio display illumination voltage is variable:
| • | The instrument panel dimmer switch |
| • | The ILLUM fuse 5 |
| • | CKT 1220 (GRY) |
CKT 1050 provides the ground path to G203 and G204.
Speed compensated volume, if equipped, is controlled by a vehicle speed signal provided by the powertrain control module (PCM)/vehicle control module (VCM) to the radio and through CKT 389 (DK GRN). As speed increases, so does the volume. Each notch of the control ring of the radio allows for more volume compensation.
