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parking brake caused my viper 5900 alarm to go off for hours

 
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k6ng6r00
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PostPosted: Tue Sep 15, 2009 2:47 pm    Post subject:  parking brake caused my viper 5900 alarm to go off for hours Reply with quote

OK guys here's one for you: Why would having the parking brake set cause my new viper 5900 two way alarm to off about 15-20 minutes after i arm it? I got out of class today and there was a group of kids standing around my car, i guess my alarm had been going off for an hour and a half right outside the window of their classroom. I went straight to the place that installed it after that and looked like a fool because we couldn't replicate the problem, but then i got home about a half an hour ago i set the parking brake and made sure all the doors were shut, and we must not have waited long enough at the shop because about 15 minutes ago low and behold there goes my alarm again. It shows the door trigger on the remote and code 3 on the led inside the car which is door switch trigger. I set the alarm again without the parking brake this time and it hasn't gone off yet. It definitely has something to do with the brake, but i just got off the phone with the installer shop and he has no idea what would cause it. Anyone have any ideas? I cant be using this thing if its going to sit in the parking lot and go off for hours when i'm out of range with the 2-way remote...

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stu89
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PostPosted: Tue Sep 15, 2009 3:02 pm    Post subject:   Reply with quote

I have a compustar 2 way alarm and remote start, and something similar happened to me. First, i would set the alarm, and exactly 10 min. after, the alarm would go off, and the remote would show the trunk open. I went back to the shop, and they "flashed" the computer on the alarm, which solved that.

2 weeks later, ten minutes after i armed it, it goes off and the remote shows its the doors, but it only happens some times. I went back to the shop again and of course i couldnt get it to go off again. They said sometimes the heat has an effect. He also told me that some GMs, like impalas and malibus are common for these things. I'm glad he told me after i paid...

Not sure if this helps, but good luck

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k6ng6r00
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PostPosted: Tue Sep 15, 2009 3:10 pm    Post subject:   Reply with quote

well i think my problem is different because i have nailed it down to the parking brake causing the problem, so the question is, to someone who knows the electronics of these cars fairly well, what changes electronically when the parking brake is on compared to when it is off? Somehow its confusing my alarm to thinking that a door is open, which also happens if i leave my dome light on, but that's not a big issue. I can deal with making sure my dome light is off, but there are some times when i am going to need to use my parking brake...

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GOTIT4CHEAP16
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PostPosted: Tue Sep 15, 2009 3:40 pm    Post subject:   Reply with quote

Hey k6ng6r00, i have been having this same exact problem with my viper 5900 alarm for the past 2 months. i recently went to a shop and got modifications to my doors and they check it out and fixed it for me. Whenever i would park my car in my driveway, i would put my parking brake on and arm my car. Then 10-15 minutes later, my alarm would just start going off and my remote reciever would show that the driver door has been ope. I then would go outside and it is closed. So it is a glitch with the driver door switch and (i guess) the parking brake.

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Frank
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PostPosted: Tue Sep 15, 2009 4:49 pm    Post subject:   Reply with quote

It has nothing to do with the parking brake...about ten minutes after the last door is closed, the BCM goes into sleep mode and sends a signal through the circuits, causing the alarm to think a door has opened as it's monitoring the door inputs. Why it does it three times - I don't know, but it's the BCM doing its normal thing.

There's a diagram on Direct Electronics installer website that has instructions on how to fix the issue using diodes, taps, and splices. Your installer obviously didn't bother to look at it. Wink

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NUTSgoWEEE
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PostPosted: Tue Sep 15, 2009 5:01 pm    Post subject:   Reply with quote

I have the same issue with mine. it's an older model viper and until just now I thought i was insane. I never noticed the issue with the parking brake but if I leave anything on in the car dome light, map light etc, about 10 minutes after leaving the car, the alarm goes off... I don't usually use my parking brake though because it needs to be adjusted and does nothing.

Got mine installed at Best Buy so maybe next time I have some spare time I'll look up the fix and make them do it. (Lifetime warranty on labor there)

Why does the BCM only do that when something is left on? Maybe i'm not fulling grasping what it's doing?

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PostPosted: Tue Sep 15, 2009 6:56 pm    Post subject:   Reply with quote

NUTSgoWEEE wrote:
I have the same issue with mine. it's an older model viper and until just now I thought i was insane. I never noticed the issue with the parking brake but if I leave anything on in the car dome light, map light etc, about 10 minutes after leaving the car, the alarm goes off... I don't usually use my parking brake though because it needs to be adjusted and does nothing.

Got mine installed at Best Buy so maybe next time I have some spare time I'll look up the fix and make them do it. (Lifetime warranty on labor there)

Why does the BCM only do that when something is left on? Maybe i'm not fulling grasping what it's doing?


Because it's turning it off so it doesn't kill your battery?

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NUTSgoWEEE
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PostPosted: Tue Sep 15, 2009 7:00 pm    Post subject:   Reply with quote

right... but why does it need to "turn off" when the parking brake is engaged?

I'm assuming this is the battery run-down protection we're talking about... which makes sense when a light is left on but when the parking brake is engaged shouldn't the BCM shut itself off immediately just like it would when the parking brake is not engaged?

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PostPosted: Tue Sep 15, 2009 7:33 pm    Post subject:   Reply with quote

The BCM never shuts down immediately....

BBEngineer

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NUTSgoWEEE
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PostPosted: Tue Sep 15, 2009 7:56 pm    Post subject:   Reply with quote

This is all fantastic information... but none of it answers the question.

Why does the BCM set the alarm off when something is left on but doesn't when not? There's obviously something the BCM does different when it shuts off when something is left on. What and why?

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k6ng6r00
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PostPosted: Tue Sep 15, 2009 8:03 pm    Post subject:   Reply with quote

I think were asking the wrong question, the installer said that the dome lights setting off the alarm is normal, because thats how the alarm figures out if a door is open, and it is delayed because some cars leave the dome lights on after you shut the door. So i dont think its the bcm setting the alarm off at least when the lights are left on. Thats why it doesnt make any sense for the parking brake to do anything.. or did i miss something?

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Sabrewings
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PostPosted: Tue Sep 15, 2009 8:05 pm    Post subject:   Reply with quote

Why not just have the installer implement the proper diode fix?

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NUTSgoWEEE
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PostPosted: Tue Sep 15, 2009 8:16 pm    Post subject:   Reply with quote

Sabrewings wrote:
Why not just have the installer implement the proper diode fix?


Eventually I will... personally I just want to know out of curiosity because I always just thought the car was possessed and got angry when i left the light on.

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PostPosted: Tue Sep 15, 2009 8:23 pm    Post subject:   Reply with quote

Depending on where the alarm is attached to monitor the doors, when the BCM cuts the interior light off, it likely leaves the line floating which the alarm sees as a door opening

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