1997 Pontiac Grand Am Interior lights

The dome lights on my car will not shut off until the battery save feature kicks in, after 20 minutes. The dash board lights will not dim with the dimmer switch on the dash.

So far I have replaced: the fuses, in the interior and under the hood, that could affect this; the dimmer switch on the dash; and the PCM (with a used PCM), and had the PCM reprogrammed at the dealer.

Is there anything else that could cause these lights to bahave like this?

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