I have the right brake lamp out issue. 4 volts at orange/yellow wire. I found on the forum the diagram for a 2000. Wire colors don't match those on my taillight. Also, while 2000 diagram shows taillight wires going to SLCM in boot fuse box, mine go into the passenger compartment.

 

The X308 Sedan Range Electrical Guide is the same from 2001 to 2003.
Every year we got a new paper package with the electrical guides to put in out 3 ring binders.
The 2002 guide was just a replacement cover to the front page stating 2001/2002.
Again in 2003 we just got a new front cover page 2001-2003.

Gus (jagrepair,com) will have S2001_XJ8 Electrical Guide on his site for download.

 

Thanks for the info. However, it doesn’t match mine. The wire colors to my taillight are different.

 

The taillight wire colours changed from the Y2000 models. I attach taillight diagrams for 1999 and 2000. One of them should be applicable to your car.

 

It says 2001 on the cover, the pdf says 2003, ...but as Bob states, its the same 2001- mid-2003.