02 Astro AWD battery drain

02 Astro AWD battery drain

Postby dhimme1045 [OP] » August 24th 2017, 6:58am

I have a short in my 02 Astro Van. Seems to be associated with fuse 19 inside, which is labeled in owners manual as instrument Panel,Radio: ATC (Main Feed), 2000 Series (Standby). Fuse 15 TBC Module, Headlamp Relay also seems to affect the draw on battery. Can anyone tell me where to go from here? Assuming ATC is automatic transfer case, but not sure what to check. No idea what 2000 Series is. Info is much appreciated. Thanks, Dennis
Original Poster [OP]
dhimme1045
Fueling (Empty tank)
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Van Model Year: 2002
Van Make/Model: Chevrolet Astro
Extra Info: 4.3 AWD

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Re: 02 Astro AWD battery drain

Postby AstroWill » August 24th 2017, 3:25pm

Welcome to the site!

First, I would recommend getting the GM Techline eSI(link in sig) as it will have the wiring diagrams that you will need.

Could you describe your testing methods? How much parasitic load are you reading?

Trolls take away from productive work, best to ignore them & go about your business.
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Re: 02 Astro AWD battery drain

Postby dhimme1045 [OP] » August 24th 2017, 4:06pm

Thank you for your reply. Can you tell me where to find the GM Techline eSI that you reference? I've had a friend helping me with this as electric is a very weak area for me. As I recall, the load is about .6. when fuse 19 is removed, it drops to .2 and then when fuse 15 (TBC Module) is removed it drops to .0007. When fuse 15 is reinstalled, drain does not increase but remains at the .00. Hope this makes some sense. Testing is using a little meter thing hooked in at the positive battery post (I believe) Thanks again
Original Poster [OP]
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Fueling (Empty tank)
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Extra Info: 4.3 AWD

Re: 02 Astro AWD battery drain

Postby AstroWill » August 24th 2017, 4:21pm

dhimme1045 wrote:Thank you for your reply. Can you tell me where to find the GM Techline eSI that you reference?

Towards the bottom: https://sites.google.com/site/astrosafa ... owilllinks
https://goo.gl/n8dJkS

dhimme1045 wrote:I've had a friend helping me with this as electric is a very weak area for me. As I recall, the load is about .6. when fuse 19 is removed, it drops to .2 and then when fuse 15 (TBC Module) is removed it drops to .0007. When fuse 15 is reinstalled, drain does not increase but remains at the .00. Hope this makes some sense. Testing is using a little meter thing hooked in at the positive battery post (I believe) Thanks again


During startup(when you first connect the battery) there will be a much higher load, it takes about 2.5minutes to settle down. See the results from my 03 at the bottom of https://sites.google.com/site/astrosafa ... tery-drain

Also, 2000 and up have RAP(retained accessory power), so when you turn the ignition key off, the radio/accy circuits are powered for about 20minutes or until a door opening is detected.

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Re: 02 Astro AWD battery drain

Postby dhimme1045 [OP] » August 24th 2017, 5:01pm

Yes I understand the loads on start up and the time it takes to "go to sleep" These draws are 20 min-1hr after shutdown. Bottom line is, I'm on my 3rd battery. Battery now goes dead over night if not on the charger. Current battery is approx. 3 mos old. Last one was about 6 mos when replaced. Definitely have a draw. Thank you
Original Poster [OP]
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Fueling (Empty tank)
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Re: 02 Astro AWD battery drain

Postby AstroWill » August 24th 2017, 5:06pm

dhimme1045 wrote:Definitely have a draw. Thank you

Most welcome, definitely if you are measuring a .6a or .2a draw, those should be easy to nail down.

Any aftermarket alarms or radios? After that, the BCM is suspect. But it sounds like you have a grasp on it, good luck and let us know how you make out.

Trolls take away from productive work, best to ignore them & go about your business.
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Re: 02 Astro AWD battery drain

Postby dhimme1045 [OP] » August 24th 2017, 5:33pm

No aftermarket currently. There was a remote starter which I removed and I did replace the ignition switch to clean up the splices from that starter. Thanks
Original Poster [OP]
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Fueling (Empty tank)
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Years of Membership: dhimme1045 has been a member for 3 full yearsdhimme1045 has been a member for 3 full yearsdhimme1045 has been a member for 3 full years
Posts: 4
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Van Model Year: 2002
Van Make/Model: Chevrolet Astro
Extra Info: 4.3 AWD


 
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