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1991 Buick Riviera Questions & Answers
Intermittent digital dash operation
The 1991 Riviera and Reatta had power supply modules which we often had problems with at the dealership when they were still under warranty. Sometimes you could tap on them and make the problem come and go to diagnose.
Intermittent Digital Dash
check the dash is sitting right, push on the dash. if this fixes it then you have a bad connection to the board pins on the back. if not there is a board in the dash that has failed usually down to a capacitor going, this age being a 91 model it dont cost a;lot for the capacitor/s to be changed but you will need some sodering skills to replace it/them.
Left turn signal
Check for blown bulbs. If both front and rear are blown you may have a bad socket or wire causing a the circuit to ground out. Or it could be a bad t/s switch.
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