Power draw

Tiny
MR.ELDRIDGE
  • MEMBER
  • 2002 OLDSMOBILE ALERO
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
Have a power draw. Just started pull the bfc battery fuse 10 amp on driver side dash fuse location stops 90% draw this is on maxi fuse l/h bec battery 2. Then pull fuse radio battery on passenger side to stop all voltage draw this is on maxi fuse r/h bec battery. Now my question is, where are the ground location at for these so I can check and make sure they are good? Best I can find is g202 but I do not know where that is located at or if I am even on the correct one.
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Monday, April 27th, 2020 AT 12:12 PM

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Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

Voltage does not cause a draw, current flow causes a draw.

You need to remove the negative cable put a voltmeter in line. Red lead on the battery and black on the cable. Set your meter to DC amps and measure the draw. If you have greater than 50-75 milli amps, it is too much. Then pull the fuses one at a time until the draw drops to normal. Then you have isolated the circuit causing the draw.

https://www.2carpros.com/articles/car-battery-dead-overnight

Roy
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Monday, April 27th, 2020 AT 12:35 PM
Tiny
MR.ELDRIDGE
  • MEMBER
Okay, my bad I put voltage in there.
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Monday, April 27th, 2020 AT 12:43 PM
Tiny
ASEMASTER6371
  • EXPERT
With voltage the results did not matter. It is immaterial.

I want to help but you need to follow the directions I suggested.

I did read all you posted and none of it made sense checking voltage.

Roy
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Monday, April 27th, 2020 AT 12:47 PM
Tiny
MR.ELDRIDGE
  • MEMBER
I have pulled that stops the draw and exactly what locations they are and what maxi fuses the correlate to under the hood.
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Monday, April 27th, 2020 AT 1:00 PM
Tiny
KEN
  • ADMIN
Hello,

If I could jump in here, the BFC fuse runs the BCM which could have an issue causing the battery draw. Here is the wiring diagrams for the BCM and ground wires. If it checks out I have included the BCM replacement instructions as well. The ground wire is under the dash on the left side. (check the diagrams below)

1. The body control module BCM must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes, the BCM will not control all of the features properly. Ensure that the following conditions exist in order to prepare for BCM programming:
The battery is fully charged.
The ignition switch is in the ON position.
The Data Link Connector (DLC) is accessible.
All disconnected modules and devices are reconnected before programming.
2. To setup a new BCM, access the SPECIAL FUNCTIONS menu on the scan tool to program the BCM. Select NEW BCM SETUP and follow the instructions on the scan tool.
3. If the BCM fails to accept the program, perform the following steps:
Inspect all BCM connections.
Verify that the scan tool has the latest software version.

Passlock Learn Procedures

IMPORTANT: If any module or device listed is replaced, programming of the module must be done prior to performing the Passlock Learn procedure.

Perform the Learn Procedure if any of the following components have been replaced:
The body control module, BCM
The Passlock sensor
Refer to Programming Theft Deterrent System Components in Theft Deterrent for the proper procedure.
The powertrain control module PCM
Refer to Powertrain Control Module (PCM) Programming in Computers and Control Systems for the proper procedure.

IMPORTANT: After programming, perform the following to avoid future misdiagnosis:
1. Turn the ignition OFF for 10 seconds.
2. Connect the scan tool to the data link connector.
3. Turn the ignition ON with the engine OFF.
4. Use the scan tool in order to retrieve History DTCs from all modules.
5. Clear all history DTCs.

To be sure you can do a CAN scan to confirm the issue if the ground is good. But to be sure lets do a CAN scan which is the future of automotive repair you can get a CAN scanner from Amazon for about $50.00 here is a video to show you how.

https://youtu.be/InIlnsjOVFA

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, April 27th, 2020 AT 1:46 PM
Tiny
MR.ELDRIDGE
  • MEMBER
Thank you ken. I will track that down and follow up if I need more assistance.
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Monday, April 27th, 2020 AT 4:20 PM

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