Well it took information from a couple of sites but I finally got it.
the unlock code to the 1997 GMC Jimmy is 1651.
1&4 or 2&3 buttons together for 6 - 9 seconds a 3 digit number appears (xxx). Hold the AM FM button a second 3 digit number appears (yyy). If the number does not change it is the same. The code was 022 in mine. so I called 1800-537-5140 when recording started I pressed 106010# and then 022022* and it gave me the code.
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A quick call to a dealer should get you some type answer on what is required to get the code I will only guess & say there is a possiblitiy that you will need a scan tool to get the factory code or whatever is in the radio now. Most likely will have to pay for that Call first,I'm only guessing
You will need to contact your local dealer with the Vin number of your truck & possibly the make of your radio. When a radio locks the dealer has the code to unlock the radio, just give them a call & you should have your radio working in no time.