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#1
01-25-2010, 12:37 PM
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Tbl with BCM, causing a battery drain!
Could the Body Control Module (BCM) give a battery signal to a fan through a Retained Power Relay (RPR) on this car?
I'am thinking there's a stuck on relay, causing the power drain. 
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#2
01-25-2010, 01:49 PM
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Re: Tbl with BCM, causing a battery drain!
If your car is an '04 or newer, when the HVAC blower speed control module fails, they will continue to run even with the key off. This has nothing to do with the RAP or BCM.
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#3
01-25-2010, 02:41 PM
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Re: Tbl with BCM, causing a battery drain!
Thanks, I never touched a Grand Prix befor!
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#4
01-26-2010, 12:34 PM
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Re: Tbl with BCM, causing a battery drain!
you're welcome. I assume your car is '04 or newer?
__________________
Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#5
01-28-2010, 02:38 PM
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Re: Tbl with BCM, causing a battery drain!
Yep!
My friend has a 2004, found these threads http://www.automotiveforums.com/vbul...d.php?t=760675 http://www.automotiveforums.com/vbul...d.php?t=747767 It look's like a new cabin filter, clean HVAC dain tube, and a capacitor for the control module connector might do the trick. A 12vdc battery-capacitor circuit for the HVAC control module. Also Google ''#05-01-39-001A'' Last edited by danielsatur; 01-30-2010 at 03:17 PM.
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#6
01-30-2010, 03:20 PM
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Re: Tbl with BCM, causing a battery drain!
Would a Radio shack 35vdc 470muf capacitor work, instead of 50vdc 330muf ?
It act's like a small battery with ignition off, so the HVAC control module doesn't lose control.
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#7
01-30-2010, 06:34 PM
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Re: Tbl with BCM, causing a battery drain!
You can also order the capacitor from Digikey, Mouser, or Mcmelectronics.
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#8
01-30-2010, 07:48 PM
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Re: Tbl with BCM, causing a battery drain!
If a 50v capacitor came out, don't put a 35v in or you'll end up back where you started.
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#9
02-03-2010, 07:26 PM
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Re: Tbl with BCM, causing a battery drain!
The under hood fuse box, Batt 4 fuse supplys battery for the blower motor control circuit, it stays on with the ignition switch off.
Bingo! We actually Isolated Batt 4 fuse from the circuit, and used a ignition switch battery instead.
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#10
02-04-2010, 10:35 AM
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Re: Tbl with BCM, causing a battery drain!
why didn't you just replace the blower speed control module?
__________________
Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#11
02-04-2010, 12:58 PM
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Re: Tbl with BCM, causing a battery drain!
I do alot of stuff for free, but not going to buy parts!
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