Where is the battery control module located?

1998 BUICK PARK AVENUE
99,999 MILES • 6.8L • 6 CYL • 2WD • AUTOMATIC
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DUSTY03
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battery won't start car sometimes like it has drained but it's not. On the display it says unknown drive.
Sep 22, 2022 at 11:10 AM
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JACOBANDNICKOLAS
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Hi,

To the best of my knowledge, this model/year vehicle doesn't have a battery control module. The system uses a voltage regulator to control output.

When the key is turned on, the PCM powers the regulator. Once the engine is running, the regulator varies the field current and the voltage output in conjunction with the PCM.

If you have concerns related to the alternator, here is a link that explains how to test the alternator's output.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Also, I attached a pic of the charging system circuit1
wiring schematic so you have a reference.

Let me know if this helps or if you have questions.

Take care,

Joe

See pic below.
Sep 22, 2022 at 9:20 PM