gas/battery/temp/oil gauges and power windows/locks quit working.

Pro quality scan tool can run functional test on the instrument cluster .. This will determine if it’s an input signal failure or the cluster itself is the culprit .. There are numerous test that can be performed with the proper scan tool ... For accurate and successful diagnostic testing - There is *absolutely nothing* that can take the place of an experienced technician with a high quality scanner! This equipment can cost in excess of 10k dollars .. I’m not referring to some sort of code reader here!

Omg! Thank you. I have a 2004 Yukon Denali and had the same issues. Battery, fuel, temp, oil, indicators all on right side not working after super cold night and alarm went off when I tried to use my aftermarket auto start in the morning. Also windows, door locks, driver buttons didn't work either. Said unknown driver and abs light was on also. I touched the pos and negative battery cables together for 10-15 seconds and a everything works again. I'm a middle aged female, not a mechanic. Problems are fixed! Your awesome.

I know this is posting on a thread from the dead. But, thank you! This just fixed my 03 Escalade. I recently had electrical work done at the dealership and things were fine for a couple of weeks until today. Slow crank followed by ABS/Battery/SRS lights on along with dead IPC and no power to windows or locks. When checking fuses and relays I found the + cable loose. I tightened it with no change. Then tried this. Fixed immediately.