Cadillac Repair: 1991 deville climate and fuel gage reading a letter d nothing else, climate control, severe pain

Question
QUESTION: OK my climate control and fuel digital gauges are displaying a lower case d and nothing else will show on these gauges but the d what does this mean and how do i fix this problem or what is causeing it? thanks!

ANSWER: You need to replace the BCM computer.

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QUESTION: what is a BCM computer, and where is it.    THANKS

Answer
It is located behind the glove box. Since multiple pictures are not allowed on this persons website you need to e-mail: cadillactech@hush.ai

as he can provide you with the information that you need.

I usually refer everyone to onlineautohelp but he is out sick with with severe pain.