Just checked my Service Manual (for my 2001). There is a process for putting the Audio System in diagnostic mode:

"Push CD button three times with pressing 1 and 6 of TRUCK TUNE APS button at the same time while the audio power is OFF and ACC is on. In diagnosis mode, by pressing CD button for 2 seconds or turning the ignition key OFF, the diagnosis mode is released."

"After diagnosis start-up, the system enters service check mode when "TUNE-UP" switch is pressed."

"Error codes over connected equipment are displayed on the screen of the tuner."

This is followed in the manual by a page of explanation of results of checks, followed by four pages of flowcharts with button sequences to get at trouble codes in each checked area, followed by three pages of charts with trouble codes explained <img src="/forums/images/graemlins/scared.gif" alt="" />.

Recommend you get or borrow a manual, take a chance with the local stealer, or go with an aftermarket deck. Good luck. <img src="/forums/images/graemlins/cheers.gif" alt="" />