Checking Radio Antenna Mast
Unplug antenna lead-in at back of radio and plug a test antenna into radio. Make sure test antenna base is grounded to the vehicle chassis. Do not touch the mast. Check radio reception in an area away from tall buildings, metal structures, power lines, fluorescent lighting, and power tools. Tune to high and low ends of the dial on both AM and FM, checking weak and strong station reception. Refer to System Performance Check - Noise or Poor Reception . If reception is OK, the problem exists with antenna (verify the antenna mast is at the appropriate torque) and/or its lead-in antenna cable. If reception is still poor with test antenna, check for aftermarket equipment that may be causing complaint.