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parasitic draw


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Hanksix
Novice

Apr 22, 2023, 4:27 PM

Post #1 of 14 (1402 views)
parasitic draw Sign In

I have a 2002 Chevy Malibu 6cyc. I've done the test and have a draw of 1.7amps. Removed Maxi Fuse 2 (30amp) drop loss to .80 amps, removed Maxi Fuse 3 (30amp) draw dropped to .01. Manual states #2 fuse = right electrical center-fog lamps, radio, body function control mod, interior lamps. #3 fuse= left electrical center-stop lamps body function control mod. cluster climate control system. removed all fuses, one at a time from left side compartment, no change, also right side, no change in power draw. All fuses intact all accessories are working, what next? Thank you


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 22, 2023, 5:57 PM

Post #2 of 14 (1390 views)
Re: parasitic draw Sign In

First let me give you the instructions to test this correctly.


Quote
BATTERY DRAW PROCEDURE


There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 30 to 40 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
Note that the act of pulling fuses will often restart some timers so you may have to wait for them to expire if that happens


Next, you are pulling maxi fuses. That won't tell you anything because they are feeding dozens of smaller fuses and/or modules for specific circuits. You have to go for the smaller fuses.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hanksix
Novice

Apr 22, 2023, 7:21 PM

Post #3 of 14 (1369 views)
Re: parasitic draw Sign In

Thanks for the reply. Here's how I ran the test. All acessories turned off. Removed neg. bat cable placed one lead on cable second lead to neg side of bat. Reading 1.7 amps. Start removing fuses one at a time in engine compartment. Both maxi fuses #2, #3 brought ampeage down to .07. Replaced maxi fuses and removed one fuse at a time in interior fuse boxes. Amperage did not drop at any time with any fuse removed. What did I do wrong? or miss?
Thanks

In Reply To


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 22, 2023, 7:24 PM

Post #4 of 14 (1361 views)
Re: parasitic draw Sign In

You didn't expire the timers so the testing is invalid.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hanksix
Novice

Apr 27, 2023, 1:30 PM

Post #5 of 14 (1283 views)
Re: parasitic draw Sign In

Mr. Hamertime. I did the re-set as you outlined in your first post and found the body function control module, left side interior fuse box, to be the culprit. Replacement mods require flash programing or vehical specific on car programing must be performed to function. Is this something a shade tree mechanic can do or do I need a shop to do this? Thanks again for the guidance..


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 27, 2023, 1:35 PM

Post #6 of 14 (1278 views)
Re: parasitic draw Sign In

If in fact you replace this unit you will need dealer level equipment to program it.

I hate to burst your bubble but the BCM itself may not be at fault. There are many functions that run through the BCM that could be causing the draw through the BCM.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
Veteran / Moderator
Sidom profile image

Apr 27, 2023, 2:08 PM

Post #7 of 14 (1272 views)
Re: parasitic draw Sign In

What did you do to determine it was the BCM itself and not some other load controlled by the BCM?
How fast does the battery go dead, is it overnight or does it takes a few day to run down?
What is the current draw after all the modules time out/go to sleep?


Hanksix
Novice

Apr 28, 2023, 10:46 AM

Post #8 of 14 (1244 views)
Re: parasitic draw Sign In

replying to both, I drew down the mods, caps, by jumping the + and - batt. cables while off the battery for 1 hour. Re-connected the + side pulled the - placed amp meter neg lead to battery - positive lead from amp meter - battery post. Amp draw 1.7. started removing fuse's first from the paasenger side box then drivers side until draw dropped to .01 amps when pulling BCM BATT fuse 10amp from driver side. The battery goes dead after about 24+ hours,


Hanksix
Novice

Apr 28, 2023, 11:21 AM

Post #9 of 14 (1238 views)
Re: parasitic draw Sign In

I have no other issues with regard to the BCM. All accessories work as they should


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 28, 2023, 11:33 AM

Post #10 of 14 (1233 views)
Re: parasitic draw Sign In


Quote
I drew down the mods, caps, by jumping the + and - batt. cables while off the battery for 1 hour. Re-connected the + side pulled the - placed amp meter neg lead to battery - positive lead from amp meter - battery post.


If you disconnected those wires without leaving a jumper in place for even a split second, you restarted all the timers all over again



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hanksix
Novice

Apr 28, 2023, 1:09 PM

Post #11 of 14 (1218 views)
Re: parasitic draw Sign In

you got me confused now. I need to leave the jumper in place between the + and - cables while off the battery , then hook up the amp meter to the - cable and - battery post, then start pulling fuses???


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 28, 2023, 1:13 PM

Post #12 of 14 (1213 views)
Re: parasitic draw Sign In

Yes, you leave the jumper for the expiration period while the meter is also hooked up so when you remove the jumper, the meter is already turned on and in place. A disconnect of even a split second starts everything all over again.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hanksix
Novice

Apr 29, 2023, 6:12 PM

Post #13 of 14 (1182 views)
Re: parasitic draw Sign In

Thanks for your help. I think I got it fixed. 72 hrs without a need for a charge.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 29, 2023, 6:14 PM

Post #14 of 14 (1178 views)
Re: parasitic draw Sign In

What did you do to fix it?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







 
 
 






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