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Can someone please tell me how to enter diagnostics on the information panel on a 1999 Seville STS? Also do the same codes for a 1995 STS pertain to the 1999 STS?
 

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1989 Sedan DeVille is now just a fond memory ....
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The codes will be different I believe because 95 may still be OBDI while 96 and up are OBDII. On my old 89 I just simultaniously push and hold Off and Warmer to enter the self diagnostics, it's similar with the newer ones but I think there is a slight difference.

Someone will be along shortly to give you the proper buttons to push.
 

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'87 Jeep, '10 Thruxton, '00 Duc 748, '01 748R (853cc)
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Press and hold the On/Off and Info Up buttons at the same time until all the dash lights go on. It will then display "All?". Press the On/Off button and it will say "All Codes?". Press the On/Off button once more and it will begin to read off the codes. Get a pen or pencil ready. If you miss any, you can always use the info button to scroll back through the menu and read the codes off again, using the On/Off button to select each option.
 

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1989 Sedan DeVille is now just a fond memory ....
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Thanks Danbuc!
 

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'87 Jeep, '10 Thruxton, '00 Duc 748, '01 748R (853cc)
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Sure, no problem. If your curious as to what any of the codes mean, just post them here, and we'll tell you what they mean. Good Luck.
 
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