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BCM settings
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ken729
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PostPosted: Fri Jul 31, 2009 3:14 pm    Post subject:  BCM settings Reply with quote

My 2000 LS will not remember my programmed radio settings for automatic door locks, alarm, chirp, etc. As soon as the retained power goes off they all revert back to the default settings with the displayed asterick. Anyone have any idea what causes this? Is there a constant 12v line to the BCM for memory that has a fuse or maybe a connection problem?
Thanks for your help
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NUTSgoWEEE
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PostPosted: Fri Jul 31, 2009 4:06 pm    Post subject:   Reply with quote

I would start by checking your fuses. With the drivers door open, pop off the panel at the very end of the dashboard. Pull out any fuses that involve the BCM (there's a key on the backside of the panel you pull off) and test them with a meter or you can usually just look at them and see that the fuse is not broken.

There are more fuses on the passenger side (same place) but I don't know if any deal with the BCM.

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ken729
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PostPosted: Fri Jul 31, 2009 4:41 pm    Post subject:   Reply with quote

I did take a look at all the fuses that are associated with the BCM and they are all good. The problem is that everything works fine while the car is running or the ignition switch is on. Its when I turn it off that it loses its memory and all of my programmmed setiings for door loclks, alarm, etc. are lost. and revert to the default settings. It acts like it has a volatile memory
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bbengineer
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PostPosted: Sat Aug 01, 2009 5:58 pm    Post subject:   Reply with quote

There are 5 fuses associated with the BCM...

Check these 3 (they are constant): The Door Lock Fuse, the Left Heated Seat/BCM Fuse and the Cluster/BCM fuse

If they are all good, I would guess the BCM is shot...

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ken729
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PostPosted: Sat Aug 01, 2009 8:02 pm    Post subject:   Reply with quote

Thanks for the info - I checked the fuses and they are all good. I think at this point only a schematic diagram would reveal how the memory operates.
I'd settle for just being able to change the default setting so the automatic door locks can be turned off and kept off without constantly working the radio keypad,
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PostPosted: Sat Aug 01, 2009 8:46 pm    Post subject:   Reply with quote

ken729 wrote:
Thanks for the info - I checked the fuses and they are all good. I think at this point only a schematic diagram would reveal how the memory operates.
I'd settle for just being able to change the default setting so the automatic door locks can be turned off and kept off without constantly working the radio keypad,


The memory is non-volatile (it's internal to the processor in the BCM), so if it isn't sticking, it's likely that the BCM is on the way out... pretty common problem (bad BCMs)

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NUTSgoWEEE
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PostPosted: Mon Aug 03, 2009 9:06 am    Post subject:   Reply with quote

I replaced my BCM last summer. Bought one from NAPA (which I've since been told was a bad choice as their stuff is refurbed), installed it myself in the dealer parking lot and they charged an hour of labor to program it.

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ken729
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PostPosted: Mon Aug 03, 2009 9:45 am    Post subject:   Reply with quote

I like that idea . Thanks.
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NUTSgoWEEE
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PostPosted: Mon Aug 03, 2009 10:58 am    Post subject:   Reply with quote

I can't remember the full details on this but I know only a GM dealer can do the program, they need to use a Tech2 for it.

Once you swap out the BCM, you cannot try to start the car. I don't recall the exact consequences, but I believe the BCM will lock itself permanently if you try to start the car before it's programed.

Talk to the dealer first and make sure they are okay with you swapping out the BCM in their parking lot then programming it for you. They told me I could do it and they would push my car into the service bay when they were ready to program it.

The BCM is under the dashboard right above the pedals. It's not very difficult at all, the plastic guard just pops off with two clips. There's something like 3 wiring connectors going into it. Only trouble I had was maneuvering it around to get everything unplugged.

Contact ZSpot, he can get parts cheaper than the dealer- I think the dealer here wanted $220 or something for the BCM

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PostPosted: Mon Aug 03, 2009 3:26 pm    Post subject:   Reply with quote

I think what i'll do is get a quote from a dealer to install a new BCM (that I will provide) and have them program it with the tech2 . I can't see how that would be any more than 1 hour of work, total. If there was another shop with a tech 2, other than a dealer, I'd be inclined to take it there .
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NUTSgoWEEE
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PostPosted: Mon Aug 03, 2009 4:33 pm    Post subject:   Reply with quote

AFAIK, a Tech II is only available direct from GM and only dealers have them... but that's just what the guy at PepBoys told me so I could be wrong.

The GM dealer near me wanted 1 hour labor for install and 1 hour labor for programming (plus $220 for parts). Which is absurd... it took me less than 5 minutes to locate, pull out, replace and put it back in and I'm sure the programming only consists of plugging in the computer and pressing a few buttons then walking away for a bit.

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PostPosted: Mon Aug 03, 2009 4:44 pm    Post subject:   Reply with quote

NUTSgoWEEE wrote:
AFAIK, a Tech II is only available direct from GM and only dealers have them... .


Anyone can buy a TechII... Frank bought one and I have been thinking about buying one

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Tim
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PostPosted: Tue Aug 04, 2009 12:22 am    Post subject:   Reply with quote

The BCM reprogramming for these impalas is pretty cool, you chose whether or not you want DRL's, Security System Enable, "Police Mode", etc.

I've messed around with a couple Tech II's.

FUN!

But EXPENSIVE!

(They were the high school auto shops, not mine)

Wish the BCM's didn't lock themselves once programed, I'd like to be able to change some settings now and then.

Never figured out why GM made some of their BCM's reprogrammable, and some (ours) only programmable once. 2 Cents

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Frank
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PostPosted: Tue Aug 04, 2009 1:59 am    Post subject:   Reply with quote

Certain 'personality' settings are reprogrammable...the ones that really shouldn't be...aren't. (country settings, DRLs, etc).

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Khipset
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PostPosted: Tue Aug 04, 2009 7:38 am    Post subject:   Reply with quote

Is it possible to program outside of the vehicle, or must it be in contact with the PCM?
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