H2 - Factory radio drawing excessive current

[Scooter911]

Hi.

I searched for a similar problem to mine, and found MANY, but no solutions. So I thought that if I provide more info then someone might have a better understanding.

My 2003 H2 battery dies almost every other night.

I thought that it was the old analogue OnStar unable to connect to the new digital cell towers, so I popped out the INFO fuse. No go.

Current draw is around 3 amps with the truck off.

I used an ammeter and disconnected one fuse at a time (from the fuse box located under the hood). Here are some of the culprits:

UPC/DIC = 480mA
TBC BATT = 60mA
TREC = 10mA
RADIO AMP = 950mA
INFO = 120mA
RADIO = 1.28A

If I pop out the RADIO and RADIO AMP fuses, the current drops to 700mA. I'm not sure if 700mA is within spec, but it sure beats 3 amps!

My truck is completely stock.

Does anyone know why the stock radio would draw so much current?

With the truck running, I even tried turning off the radio via the switch, but current draw remains the same. So basically, whether or not the radio is physically on or not, it is drawing lots of current.

If I don't get a fix soon I'll likely just rig up a DPDT switch under the dash so that I can kill the amp and radio during the night - just so that I don't have to keep boosting the truck in the morning.

Thanks in advance!

Scooter

[HUMTECH]

Need a new radio. Seenthis problem quite a few times, radio is staying awake and the only fix is to replace or have someone that knows how to repair them fix it. Should only draw somewhere around 50-80mA once all the modules in the truck have powered down and the key is not just turned off but pull it out of the ignition

[Scooter911]

Thanks. I figured as much.

I measured ~700mA with the radio fuses out, but I read that I should have waited for at least 4 hrs after removing the key before measuring the current because it takes that long for some modules to settle. I'm hoping that 4 hrs the current draw goes much lower than 700mA or I might have more problems.

I would like to install a computer with touch screen so this might be the push I need! For the time being a toggle switch will be a cheap fix.

Scooter

[Scooter911]

Hi.

Well, it's been a while since I last posted but I think I found the culprit. I simply unplugged the fuse to OnStar and have not had a dead battery since.

Scooter

[VegasGuy]

Good fix. Plus, Government Motors cannot track your every move.

[OrangeCrush]

Just out of curiousity, why would onstar draw so much amperage? Doesn't it shut off if the truck is off?

Do you actually have Onstar or is it on the truck but you don't have a subscription. I'm just wondering if when you have a subscription, perhaps it runs all the time to keep GPS going...

Mark