This information can be found in your owner's manual. If you don't have one, you can order one from a dealer. You may also find one at a salvage yard.
AnswerThere is a keyhole between the "X" and the "K" of the "XK8" logo on the back of the car. Enjoy!
On the 1997 XJ6 and I am assuming the 1996 & 1995 XJ6 to the right of push button to open the truck is the XJ6 logo and the hole just left of the logo is the keyhole.
If the battery is totally dead, the key will NOT work. Open the hood, on the drivers side is a positive pole (covered be a black plastic cap) next to the fuse box. Use this pole with a jumper cable. Red to this pole, black to a ground...Walla!
In the trunk, on the right hand side. Remove the trunk covering to expose the spare tire; then remove the panel on the right to get to the battery.
In the trunk
What do you mean by "valet mode"? If you mean the trunk release button won't work, there's a valet switch inside the glove compartment that activates and deactivates it. Just turn it off. OR You use the black key in the trunk keyhole which is located in the xk8 emblem. The Keyhole is located between the x and k. That should take it of valet mode.
its in the trunk under the tire..
In the trunk number 4relay
The CD changer is in the trunk on the right side.
Its in the trunk
it is located in the trunk
In the right compartment of your trunk.
Key
Try the trunk under the mat next to the spare.
Call a locksmith.