Antenna: Description and Operation

SYSTEM OPERATION
The power operated radio antenna is a whip type antenna, extended and retracted by a reversible electric motor.

The Automatic Power Antenna is controlled by a combination of an internal relay and limit switches which, are built into the antenna motor housing. This antenna is actuated when the radio is switched ON and the ignition switch in ON or ACCESSORY position. When the ignition switch or the radio is turned OFF the antenna mast should retract fully.

Many antenna problems may be avoided by frequent cleaning of the antenna mast. Clean the antenna mast with a clean soft cloth.

Before an antenna is removed, the antenna performance should be tested to decide if it is a reception problem or an operational problem.

Whenever a operational malfunction occurs, first verify that the radio antenna wire harness is properly connected. Check all connectors before starting normal diagnosis and repair procedures.

CIRCUIT OPERATION
The power antenna is used on the premium systems only. Battery feed for the antenna is provided from two different circuits.

One is the M1 circuit. The M1 circuit is used to supply power to the Body Control Module (BCM), Power Mirrors, and the Power Door Locks. This fuses also used in several other circuits. The IOD fuse is removed during vehicle shipping to prevent excessive battery draw.

The other circuit is the X60 circuit from the radio. This circuit is HOT when the radio is in the ON position. Ground for the antenna is a case ground.