1990 Buick Reatta interior lights

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In my 1990 Buick Reatta none of my interior lights work. Is this a common problem and what would be the best way to go about tracing it. 

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Key on, engine off- only 1 door open at a time, do you hear a CLICK when you release the door jamb (near hinges) plunger switch? If not- check your fuses. The 27 year old relay could also be tired. With engine running, take out of park. Do doors lock automatically? Any DOOR AJAR warning if you open a door while out of park?


On the headlight switchpod- if you move the PANEL LIGHTS selector all the way to INT- do you hear a CLICK? Do the courtesy lights come on?



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