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That's probably the headlights coming on and going off, depending on light falling on the center of the dashboard near the windshield. When the headlights are on, the displays are on the headlight switch dimmer.

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That is goes totally dark is not normal, it could be the digital dash itself or a bad connection.. I had a digital dash go bad in an 86 Corvette and sent it to http://www.modelelectronics.com for repair, they do repairs for local GM dealers... You need a diagnostic for the digital dash from a 92 service manual before assuming its the dash however to do some testing..

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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