If the bass has active pickups, then you will have to replace them with passive pickups. If the bass has an active pre-amp, then you can bypass the pre-amp with the proper switch.
+1
There are three types of "active basses"
- Active pickups with passive controls (small value pots for vol & tone and small preamp circuits built right into the pickups)
- Passive pickups with an active preamp. This is the most common "active bass" from large manufacturers.
- Active pickups with an active preamp. Rare and will usually have two or more batteries, one for the pups and one or two for the pre.
So, you probably have passive pickups with an active preamp. With the big manufacturer basses, the preamp usually makes up for some less than stellar pickups. If you are up to the soldering... find a passive wiring diagram for your bass - looks like the Fender Lyte has 4 controls, so you could do vol vol tone tone or traditional vol vol tone and have a dummy pot just for looks. Buy the pots and caps - lots of threads here about that or you could just go to a site like stewmac or guitarpartsresource etc.
Remove the existing preamp and battery. You can reuse the 1/4" jack but you will not connect anything to the "Ring" section. You probably won't be able to reuse any of the existing pots bc their ratings are too small and will bleed massive amounts of tone out to ground. Plus, it's easier just to remove the whole preamp, disconnecting the pups and jack.
Solder and install the new parts per the diagram. You may even be able to find a prewired one online and just wire the pups and jack.
Check out the sound. If you don't like the sound, get some new pups - lots of threads on TB about that too.