Well the title describes the issue.
The 04 XJ8 presently refuses to go into the test mode.
Has always worked before, but not now
Does anyone know why, & how to remedy the situation ?
The 07 will not either, ever since it was purchased.
Being a later year, is it supposed to?
Apprecite any & all assistance in advance

 

Decided to remove the steering wheel & adjust it yeaterday.
Was a bit off center from when the a/c pump was replaced.
Did a hard reset, while the battery was disconnected, to remove the air bag.
Everything is back to normal now,
Am at a loss to understand why it stopped working in the first place.
Just glad it works again, almost like having a built in reader from the factory.

 

How do you get it in test mode?

 

Press trip button in & hold, then turn ignition on, release the button five to eight seconds later.
Scroll through the information by pressing the trip button .
Hope this helps

 

I think the instrument test mode was removed, possibly after 2006. I know it doesn't work on my 2008 X358.

Pete M

 

Tried that but unfortunately 2004 would not cooperate.

 

Have you tried doing a hard reset?
If not read my second post.
Other than that i'm at a loss for information.

 

Thanks. Will try the hard reset. Have not done one for a while.