2001 silverado 1500HD No DIC, No PRNDL, No tach, No fuel gauge, No AC controls!!!!

king_strut · Oct 13, 2024

Ok, so here are the details of my truck and the issue I have. It is a 2001 Chevy SIlverado 1500HD 4wd with auto a/c. I went to my truck the other day and turned the key on, fired the truck up and went to turn on the a/c. Nothing happened at all, no blower motor no compressor no lights on a/c control panel other than a/c on light which got brighter when I tried to turn the fan speed up and which also would not turn off neither would the recirc. Then, I noticed that I had no tach and the fuel gauge and the temp gauge were neither one work along with the info center and the PRNDL! I checked every fuse and every relay I could find including the ones under the dash beside the brake pedal which have nothing to do with what I am having trouble with as far as I have ever know. I have been a mechanic for a very very long time and have never seen this issue before and have checked all the grounds I could remember the location of. I have two other trucks of the same gen tried the cluster from both same issue. Tried the a/c control panel from both and again same issue! Solus says no codes and gave no help at all GRRRRR!!!! Any ideas guys? I really want my truck back to full working order and am stumped! Thanks for any help you can offer in advance!!!

azswiss · Oct 13, 2024

If the fuses/relays are good, grounds are OK, no ~~network~~ codes, and swapping out cluster & HVAC modules does not make a difference then the next step is to verify if power is making it from the fuses to the modules & cluster. The links below provide power distribution info for the cluster & HVAC controller & blower. One *potential* culprit could be a broken trace(s) in the underside of the fuse block.

Instrument Cluster Schematics: IGN 1, IGN 0, Cruise, Radio Fuses

HVAC Schematics: Blower Controls - Primary (Primary Blower Controls)

Here is a link to a recent problem/solution involving broken traces underneath the junction block:
long crank after engine suddenly stops (see post #37)

Edit: Ignition switch should also be checked.

mrrsm · Oct 14, 2024

This issue is very reminiscent of a "Rodent Depredation" Issue occurring under similar circumstances:

Tachometer not working

Hello All, I have a new to me, 2001 Silverado 1500 2wd with 165K miles on it. Being 16 years old and 165K+ miles, it has it's share of gremlins that I am slowly fixing. One that has me stumped right now is the tachometer not working. I have read various threads about the instrument cluster and...

www.silveradosierra.com

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Tachometer not working

Hello All, I have a new to me, 2001 Silverado 1500 2wd with 165K miles on it. Being 16 years old and 165K+ miles, it has it's share of gremlins that I am slowly fixing. One that has me stumped right now is the tachometer not working. I have read various threads about the instrument cluster and...

www.silveradosierra.com