Summer went on so long and I really didn't drive at night, that now when I drive in the morning and HAVE to turn the lights on, I noticed the controls for the heater controls are dark. I cant remember, old age I guess, but are these supposed to illuminate? All the other dash lights seem to work. And if they are to illuminate, how do I replace or access the light.
2004.5 2500 Cummins 6 Sp Thank in advance to all that answer
Yes, there are three mini bulbs inside the heater control module. Unfortunately, it doesn't look like they're servicable. But, to check it, remove the center bezel by removing the one screw above the trach bag hook (just to the left of the glove compartment). The bezel is then held in place by spring clips. Grasp the bag hook, and pull straight out. Work your way around the perimeter of the panel, popping it loose. But, before doing this, lower the ash tray and drink holder - otherwise, the spring clips on the center bezel will gouge the face of them while you're disconnecting the electrical connectors.
Once the panel is off, rest it on the cupholders, and disconnect the various electrical connectors. They're all different, so there's no chance of mixing them up later.
The power to the heater control lamps is on pin 8 of the large connector going into the heater controls. It's an orange wire with a gray stripe. Check for voltage on this pin with the interior lights turned on. If that's good, you might have a ground. Pin 5 on the same connector, a black wire with a light green stripe, is the ground. Check for continuity between this pin and a known good ground (the dash frame will do fine). You can then try supplying voltage directly to the pins on the heater control that correspond with those on the connector. A 9V battery will do. If you can't get them to light that way, it's pretty sure you've got a burned-out panel.
As I said, I've never tried taking one apart before - it might not even be possible. You could chance it and try and see if you can replace the bulbs, you can live with it, or you can buy a replacement control from either the dealership or possibly a junk yard.
Thanks so much for the DETAILED response.........I will work on this and report back..............
Lots of luck trying to find the trach bag hook. :)
beekeep
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