The 2004 models were made of solid Mahogany and Walnut or Alder and Maple timbers and have a pair of Zone humbucking pickups powered by an 18V active 3-band preamp.
Part of the best-selling Fender American Deluxe Series, the Zone Bass replaced the Japanese P-Bass Lyte Deluxe (which featured a mahogany body, an active humbucking Jazz Bass pickup in the bridge position and a single 9V powered 3-band active EQ preamp), which was gone a year earlier.
The Mexican made Fender Zone bass is essentially the same design as the Fender Precision Bass Lyte, which was manufactured in Japan, except for the addition of a set of custom-wound hum-cancelling P/J pickups and a three-band active EQ powered by a single 9V battery.
The J-style bridge unit is a customized version of a pre-2004 Deluxe Active Jazz Bass pickup.
On the five-string Zone, it's a Vintage Noiseless Jazz Bass pickup with solid covers.