I had an issue where the service battery charging system would come on intermittently. I have a good battery, alternator is good, replaces the BMS and checked and cleaned all the ground cables.

I finally located the draw down to fuse #42 in the engine bay of my 2009 Chevy Suburban LTZ which turns out to be a 15A fuse for the RDO (radio).

I need assistance to locate the wiring diagram from the fuse block to the radio so I can locate the issue. Does anyone have information on where I can locate the schematic?

TIA

 

I will stick along here as my 07 suburban is also draining battery after battery. I have checked the fusebox with my uncles heat seeking camera and found the headlight relay coil being hot/active though no headlight is on. I know for a fact that the gmt 900 suvs have 2 seperate relays for the daytime running lights and silverados and other trucks have 2 power 1 relay system. Now enough about that, i pulled the relay to hooefully stop the drain, but it did not stop. Im guessing BCM as the relay gets its power from there.
2 more things to know, i live in europe so i have had to add a rear foglights, is wired with the front ones, so it cant activate whenever it wants. 2 my trailer turn nignal decoder went bad(no more seperate left blinker and brakes were permanently onn) at this day it is all disconnected so it should not use any power. But im out of energy with this car, havent had it for a year and had to replace:
gearbox
brakes and pads
2 front drive axles
that stupid oil pump seal and thus prevantative also the oil pump to the higher pressure one from melling, most engine gaskets.
that headlight **** left of the steering wheel with fog light button

to do
make front brakes stop dragging
electtical drain and sometimes engine rpm reads 0 anf you get no power
rear 13 pin trailer electrical + new usa to eu taillights module
Trans oil leak at some seal near the radiator.
and lastly if i keep this car when it is fixed i also need to got to inspection for my trailer hitch, get some new tires, wax it and get that teeny tiny scratch gone and replace the speakers.

i have the basic electrical plans, i think pinouts are on them, but i have no schematics of certain seperate modules like the bcm for instance. So if you need the little bits i have hit me up. It is 7-8 electrical plans for each seperate model of gmt 900 family including: 1500,2500 silverado, 1500 tahoe and suburban, 2500 suburban, escalade, avalanche and escalade pickup etc

 

Update, it’s not the fuse for the battery.

while moving wires around I must have moved a wire away from a short possible at the dash fuse box for a while but the battery warning message came back and continues to come back intermittently.

Any help on a schematic for wire would be helpful.