Suggestions for 2003 GMC Envoy with a parasitic amp draw

[cbrew4dash20]

I have a 2003 GMC Envoy SLT 4.2L. As far as I know, there is no aftermarket equipment. The radio/CD player is OEM. My problem is that every morning I have to use my jump charge to start the vehicle. Throughout the day, I am able to start my car without issue.

As the 78 battery was 8 years old, I replaced with a Duracell battery from Sams Club. I had the same dead battery issue the next morning.

I suspect there is a current draw when the vehicle is not in operation. I used the EverTough Hound Tester from a local auto parts store to measure amperage across each fused circuit. I am aware that components have a wake condition. Therefore, prior to shutting the vehicle off and removing the key, I rolled down the windows and opened the hood. This way I could measure the current draw at each fuse without (hopefully) causing a wake condition.

After two hours, I measured these values:
Engine compartment:
Fuse 10 (Powertrain Control Module B) =410 mA
Fuse 24 (Instrument Panel Cluster/Driver Info Center =440MA
Fuse 30 (Air Conditioning) =50mA
Cabin (under back seat):
Fuse 10 (DDM) =60mA
Fuse 12 (PDM) =50mA
Fuse 27 (Onstar) =210mA
Fuse 41 (Radio) =610mA

Is there any refenence material that notes the expected amp draw of circuits? I might be ok with the circuits at 50-60mA. However the PCM B, IPC/DIC, Onstar, and Radio appear excessive.

If you have any other comments regarding the amp draw, I'm all ears.

Thanks in advance!

 

[budwich]

the "1.5 amp" draw from those three components are going to kill any battery in a 12 hour period / over night.

my first suggestion is disconnect the Onstar unit. That unit maybe causing some issue resulting in ongoing "wake" type messaging going to the radio... which in turn maybe be causing messaging to go to the IP panel (eg. status type things). Not sure about the PCM but would expect it to be "sleeping" at about 125ma.

i am sure others will have additional info on expected draws. I believe there have been a number of "parasitic drain" posts.

 

[cbrew4dash20]

the "1.5 amp" draw from those three components are going to kill any battery in a 12 hour period / over night.

my first suggestion is disconnect the Onstar unit. That unit maybe causing some issue resulting in ongoing "wake" type messaging going to the radio... which in turn maybe be causing messaging to go to the IP panel (eg. status type things). Not sure about the PCM but would expect it to be "sleeping" at about 125ma.

i am sure others will have additional info on expected draws. I believe there have been a number of "parasitic drain" posts.

Budwich,

After observing the amp drags on these fuses, my thought was to pull the fuses for OnStar and the radio. Then, remeasure to see if there are changes.

I did not consider the Onstar amp draw may cause the other circuits to be "awake" and cause drains on their circuit.

Thank you for your perspective. I'll update the thread with my measurements tomorrow.

Thanks!

 

[Mooseman]

I would unplug the OnStar module rather than pulling its fuse. It may power other circuits.

This thread, once resolved, showed a normal draw or .08-.15A (or 80-150 mA) when asleep.

SOLVED! - Parasitic battery drain

I'm thinking this interface may be bad, before even connecting it to the radio the interface was already warm to the touch as if it was powered on. Re-checked all the wiring connections, and its wired just like I did with the Trailblazer's radio I installed using the same setup. PAC Interface...

gmtnation.com

I can't think that all those modules are defective. Something is keeping them awake.

As a test, try unplugging the ignition switch to see if everything goes to sleep and the draw drops. Since you have so many draws, I would use the meter between the battery post and battery cable to watch all the draws at the same time.

 

[Sqrly]

Mine was caused by the IPC, it had silver migration between the solder joints.

I did put a meter between the battery and cable. There I could see the current drop as things went to sleep one by one, or did not. It takes a few minutes.

When I unplugged the IPC and checked again, everything went to sleep. If you find the same issue, don't send your IPC to the guy I did

 

[Mike534x]

I would unplug the OnStar module rather than pulling its fuse. It may power other circuits.

This thread, once resolved, showed a normal draw or .08-.15A (or 80-150 mA) when asleep.

SOLVED! - Parasitic battery drain

I'm thinking this interface may be bad, before even connecting it to the radio the interface was already warm to the touch as if it was powered on. Re-checked all the wiring connections, and its wired just like I did with the Trailblazer's radio I installed using the same setup. PAC Interface...

gmtnation.com

I can't think that all those modules are defective. Something is keeping them awake.

Haven't had my morning coffee yet, sitting here going "oh hey that thread looks oddly familiar! wait....that's me"