04 silverado electrical problems

[hs1970bug]

Started out service brakes in message board then Abs light comes on then guages not working or radio battery light on and door locks dont work would come in and out now gone replace ignition switch

[jdl]

I'd probablt check the feed circuits to and from the ignition switch, maybe you already did? Will the vehicle start and run? Have the codes checked.

[hs1970bug]

Originally Posted by jdl

I'd probablt check the feed circuits to and from the ignition switch, maybe you already did? Will the vehicle start and run? Have the codes checked.

Truck runs good cant check the codes it wont comunicate withe scan tool unpluged bcm and truck still runs

[j cAT]

Originally Posted by hs1970bug

Started out service brakes in message board then Abs light comes on then guages not working or radio battery light on and door locks dont work would come in and out now gone replace ignition switch

too many different circuits going bad ,,,,must be a ground circuit...

you need to use a meter to verify if its the positive or ground circuits at fault.

[hs1970bug]

could you give me example on testing circut for positive fault i took my multi meter and checked all the fuses if it was a positive short would it blow the fuse

[j cAT]

Originally Posted by hs1970bug

could you give me example on testing circut for positive fault i took my multi meter and checked all the fuses if it was a positive short would it blow the fuse

when checking circuits you must check for proper grounds/return...

having a positive connection/feed is only half the circuit...if you don't have a proper ground these issues like yours occur..

[Bob B]

Originally Posted by hs1970bug

Truck runs good cant check the codes it wont comunicate withe scan tool unpluged bcm and truck still runs

------------------------------------------------------------
Hi,
When my 97 wouldn't communicate with the scan tool, It was caused by a blown fuse for the lighter socket.
Bob B

[hs1970bug]

the cigarette lighter ok checked some wires at bcm Im not sure where to trace back from insterment panel or ignition or door locks got to be some ground I had an aftermarket remote starter took it out no change it acts like security problem

[j cAT]

Originally Posted by hs1970bug

the cigarette lighter ok checked some wires at bcm Im not sure where to trace back from insterment panel or ignition or door locks got to be some ground I had an aftermarket remote starter took it out no change it acts like security problem

since you had an after market remote starter installed this could be part of the problem...these people use in most cases , poor connections that are not to be used in any application never mind a vehicle ...


gm vehicles have a well known defect with the ground connections throughout the vehicle.. normally in the rust belt regions..

the ground points through out the vehicle need be removed cleaned to shinny metal re-installed then coated with a undercoating product...

engine compartment,under the driverseat under the vehicle, frame rail next to the fuel tank, behind the engine,,,,etc....

[hs1970bug]

Having no luck finding wire will have to take to repair shop in near future I wont stop looking

[hs1970bug]

appointment weds. for my truck I tried my best thanks for help whatch it be something stupid

[hs1970bug]

Well I got a call from the auto electric shop and it turns out THAT THERE WAS A SHORT IN THE AIRBAG MODULE so remedy unplug until I get the money to fix cost $500 So it only cost me $65 to find out

[j cAT]

Originally Posted by hs1970bug

Well I got a call from the auto electric shop and it turns out THAT THERE WAS A SHORT IN THE AIRBAG MODULE so remedy unplug until I get the money to fix cost $500 So it only cost me $65 to find out

I dont see how this air bag module could short out the non related electrical equiptment..

for 500.oo they obviously made a written guarantee , that This is the problem ..

[hs1970bug]

yep all the guages work radio door locks work now cant argue that all that was done to bring things back up If I dont post anything else that means its still working I just dont have airbag now im going to look at all data print they told me $390 for airbag Module and $120 to program it I dont know if it needs programed

[j cAT]

Originally Posted by hs1970bug

yep all the guages work radio door locks work now cant argue that all that was done to bring things back up If I dont post anything else that means its still working I just dont have airbag now im going to look at all data print they told me $390 for airbag Module and $120 to program it I dont know if it needs programed

thinking about this it is possible,,, the BCM gets screwed up when this module shorts out...

these circuits are GM top secret...so it is impossible to say for sure ...