need help fast please

[bowtiebo]

I have a 2007 new body Silverado 1500. I hit a set off railroad tracks pretty hard and ever since then me electrical had been messed up my rear night time running lights do not work, all but 1 speaker don't work, my ac blows 90 degrees all the time while on, on the passenger side only, my front left tire pressure reads low when they all are equal pressure my horn when looking the doors with the key fob does not work. every now and again if I hit a pot or ajar the truck the will work for a split second. If anyone has any input or suggestions on where to start checking wire at it would be greatly appreciated thank u much

[txab]

Start by checking battery cable and connections for being tight and clean. Check body grounds as well

[&CDFiXER%]

Might also get the battery tested. Might have busted some plate(s) and/or connections loose in the battery if you hit hard enough.

 

Def +1 on the grounding and batt cables though...

 

Still no joy, then start checking the larger electrical connectors make sure they are all still tight. You are indicating issues with multiple systems that really only have the bus and power/ground connections in common. Get a schematic and start checking where these affected systems get their juice or return it to the frame. The bus may be ok or the CEL would be going nuts and you would have codes out the wazoo.

 

If it helps, the TPMS & remote door lock/unlock use the same module.

[gmtech4]

Alldata.com

 

You have real problems , unless you can read between the lines of a schematic you should just take it in bud

 

My 2 cents

[Zebrafive]

I would start with checking battery voltage. Low voltage could be causing your problems

[bowtiebo]

Thanks for the input everyone.... After checking everything asking around and lots of reading I think I've narrowed it down to the bcm. I have a new one on the way will give inputs on the results.

[SpecRacerDriver]

I would start by disconnecting the battery to reset everything in the truck's brain first. Next, check all of the fuses. If that doesn't do any good, I'd take it to a dealer.

[gmtech4]

I would start by disconnecting the battery to reset everything in the truck's brain first. Next, check all of the fuses. If that doesn't do any good, I'd take it to a dealer.

No he said he'd rather ask around and guess instead of doing the correct thing , I'll bet he did the BCM thing a month ago( which you need programmed by a dealer ) , it didn't work and he won't come back , imo