Shine a torch thru each hole and see what symbol lights up, then you can work out if your vehicle needs thatThank you Bex, I'll check that diagram out. I did find a video on YouTube that showed the bundled red, white, and blue wires on the back of the dash cluster go to a check engine reset switch. I did not have that plugged up, I'm curious if that caused it to burn the R221 check engine light diode.
Also, there seems to be a whole row of lights missing on the lower back section of the dash cluster is this normal (see photo).
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