2000 s70 GLT se, gave to my daughter. light switch burnt up, took out an engine relay, son in law fixed everything, all lights come on except the tail lights, they will work with a jumper wire from the battery, he checked all the fuses, any ideas? brake lights work,

 

Check the rear bulb failure warning module in the trunk. If I remember correctly, it is on the left side of the trunk, behind the carpet, by the power antenna.