Originally Posted by Mark Fahey
Not much action in the Electrical section so I thought I'd try here. The display part of my DIC works but none of the buttons have any effect. I tried using dielectric grease on the connector but that didn't help.
Any ideas on what to try?
I'll assume you have already tried what BoneZ suggested first and will continue on from that point.
You should not use dielectric grease on these types of connectors. This is generally reserved for connectors that are exposed to moisture (underhood, outside body, etc). This will not help "make" a connection where one doesn't exist.
If none of the buttons work, you may have a bad ground. These buttons work by grounding various inputs on the instrument cluster. This circuit ultimately grounds at a splice pack on the driver side, behind the trim cover that goes around the hood release handle. It is bolted to the body and looks like a small black module. Ground problems are relatively uncommon on the 2000+ Bonneville because GM became much smarter about where they are located. The ground wire also runs through one of the two large, 40 cavity connectors behind the knee bolster in front of the steering column. You may want to make sure nothing was disturbed here.
You may also want to remove your instrument cluster and re-seat it making sure it is fully engaged in the dash. You may have a defective cluster. There is a way to clean the connectors that plug into the cluster, but I'm not convinced this is the problem. I would be if it was just one or two switches and the problem was intermittent.