oem alarm sometimes goes off w viper 5900
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=104243
Printed Date: April 28, 2024 at 10:00 PM
Topic: oem alarm sometimes goes off w viper 5900
Posted By: slamdaccord
Subject: oem alarm sometimes goes off w viper 5900
Date Posted: April 24, 2008 at 3:13 PM
i have an 04 accord coupe v6 6speed. i installed the viper 5900 in my car about 2 months ago. every now & then, when i either remote start it or hit unlock/disarm on the VIPER 2way remote, the factory alarm will start going off (horn honking, headlight flashing) if i remote start it while its armed and it starts doing this, i hit the remote start (* button) again and it will shut down and the oem alarm will stop panicking as well. if i disarm it (not remote start it) with the viper remote, sometimes the oem alarm goes off as well, if i try hitting disarm on the viper remote again, nothing happens, only if i hit unlock/disarm on the factory keyfob it stops i did hook up the factory arm/factory disarm wires from the viper alarm to the factory alarm wires (inside drivers door) sometimes i can go a week without it doing it. sometimes it will do it right after. it happened today on the way to work. at work i disarmed to open the door, it did it again. do i need to use a bitwriter and go into programming-if i do, what settings do i need to change? or what else can be done?
Replies:
Posted By: enice
Date Posted: April 24, 2008 at 3:33 PM
I recommend using a relay to give a solid ground to that disarm wire on the accord. It may not get a consistent signal by just simply using the disarm wire on the viper.
Posted By: chriswallace187
Date Posted: April 24, 2008 at 10:27 PM
Ditto on the relay use - the factory disarm wire on Accords takes a lot of current, and the alarm doesn't shut off with ignition either.
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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: slamdaccord
Date Posted: May 21, 2008 at 6:46 PM
alright so i put a relay on it today and it made no difference. factory alarm still goes off SOMETIMES when i remote start it or unlock it from viper pad. any other suggestions? all the wiring is fine. i went through and double checked it
Posted By: chriswallace187
Date Posted: May 22, 2008 at 12:41 AM
How do you have the relay connected?
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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: slamdaccord
Date Posted: May 22, 2008 at 10:42 PM
what do you mean? i mean the relay works. i can hear it clicking and feel it when i hit unlock/disarm
Posted By: Big Dog
Date Posted: May 23, 2008 at 8:38 AM
I think what chris wallace meant was, you should use the light GREEN/ black factory alarm disarm of the 5900 to activate your relay - not the unlock wire. Also, make sure that you send a true ground, for example pin 30 to ground then pin 87 to the disarm wire in car.
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Prepare your future. It wasn't the lack of stones that killed the stone age.
Posted By: peterubers
Date Posted: May 23, 2008 at 10:31 AM
I've always been hit or miss as well with Accords and that "blue" disarm wire in the door... The extreme alternative is UNLOCK before starting and re-lock after start -- should be a selection in programming of the Viper Too much ground (longer than 750ms) to that disarm wire and you'll unlock the doors. I agree with the above, relay the -250mA disarm output to a relay with a good chassis ground connection -- try a separate ground site than the viper brain ground. ------------- The search function is your friend.
Posted By: chriswallace187
Date Posted: May 23, 2008 at 3:59 PM
slamdaccord, I was asking specifically where you have each terminal on the relay connected, and how(solder, butt connector, tape-n-twist, etc).
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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: slamdaccord
Date Posted: May 24, 2008 at 11:09 AM
everything is soldered, taped & zip tied. my the ground is at a different ground (kick panel) and it's wired like BigDog said to do
Posted By: chriswallace187
Date Posted: May 25, 2008 at 10:09 AM
Ok...another thing I just thought of. What color wires do you have arm and disarm connected to inside the door? Peterubers mentioned "blue" which isn't correct for '03-'07 Accords(the wire is blue on the '98-'02).
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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: slamdaccord
Date Posted: May 27, 2008 at 9:38 AM
chriswallace187 wrote:
Ok...another thing I just thought of. What color wires do you have arm and disarm connected to inside the door? Peterubers mentioned "blue" which isn't correct for '03-'07 Accords(the wire is blue on the '98-'02).
i'm not at work right now but from what i can remember the wires are WHITE/ red = arm white = disarm
Posted By: slamdaccord
Date Posted: May 27, 2008 at 9:40 AM
peterubers wrote:
I've always been hit or miss as well with Accords and that "blue" disarm wire in the door... The extreme alternative is UNLOCK before starting and re-lock after start -- should be a selection in programming of the Viper Too much ground (longer than 750ms) to that disarm wire and you'll unlock the doors. I agree with the above, relay the -250mA disarm output to a relay with a good chassis ground connection -- try a separate ground site than the viper brain ground.
even if i do this, this MIGHT help the factory alarm to not go off when i remote start it....BUT what about the random times when i only hit disarm/unlock on the viper (not remote start it) and the factory alarm goes off?
Posted By: chriswallace187
Date Posted: May 27, 2008 at 12:37 PM
slamdaccord, I think most of the above post which you've quoted applies to the '98-'02 Accords...their disarm was a bit more finicky.
I reread your statement that the factory alarm will stop going off when you shut the r/s down or lock the doors with the viper...this makes me think you might just have reversed your factory disarm and factory rearm wires.
Arm should be WHITE/ red, disarm should be white as you posted...but it's pretty easy to mix them up if you're only running 2 wires into the door.
I actually did that on my buddy's '95 maxima, only better...I was doing driver's priority unlock, and hooked the 2 wires from the unlock relay up to the lock motor lead. It took an hour or so to figure out why the remote worked fine and the doors didn't unlock at all.
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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: slamdaccord
Date Posted: May 27, 2008 at 10:17 PM
chriswallace187 wrote:
slamdaccord, I think most of the above post which you've quoted applies to the '98-'02 Accords...their disarm was a bit more finicky.
I reread your statement that the factory alarm will stop going off when you shut the r/s down or lock the doors with the viper...this makes me think you might just have reversed your factory disarm and factory rearm wires.
Arm should be WHITE/ red, disarm should be white as you posted...but it's pretty easy to mix them up if you're only running 2 wires into the door.
I actually did that on my buddy's '95 maxima, only better...I was doing driver's priority unlock, and hooked the 2 wires from the unlock relay up to the lock motor lead. It took an hour or so to figure out why the remote worked fine and the doors didn't unlock at all.
i doubt i have them backwards because like i said..it doesnt ALWAYS do this..only sometimes.
Posted By: chriswallace187
Date Posted: May 28, 2008 at 1:30 AM
It's conceivable to me that reversing the wires would cause an intermittent fault.
The factory alarm and lock control module (I think Honda calls it the MICU) on the Accord has several inputs, including but not limited to the position of the driver's door lock actuator(locked or unlocked), the lock/arm and unlock/disarm wires from the key cylinder, and the actual power lock switch inputs. The MICU contains logic circuitry which will evaluate those inputs and give an output(such as "lock doors", "sound alarm", "flash LED", "roll windows up", etc.) based on the inputs it's seen.
In all likelihood, the electrical engineers who designed it may have designed it to arm and lock when it received one or more of those inputs. They may not have designed the logic to properly deal with contradictory inputs (in electronic engineering parlance these are called "don't cares" because in theory they aren't supposed to happen, and they can be ignored if it means less complicated logic circuits inside the MICU).
Let's suppose you do have those 2 wires switched. When you push "unlock" on the Viper's remote, it sends out a (-) pulse to the arm wire(on the Honda) from the factory disarm output(Viper). It also sends out a (-) pulse to the unlock wire which I'm assuming you've connected to the wire from the passenger door lock switch, which will unlock all the doors.
Since the lock and alarm circuitry in the MICU was designed to treat this situation ("arm", "unlock switch", and "actuator unlocked", all at almost once) as something that can theoretically never happen, there's really no telling what it will do.
Also, there's a slight difference in the speed that either of those (-) pulses ("disarm" and unlock) get to their destination, and the MICU might just decide to go with which one it sees first(which isn't necessarily the same every time).
Anyway, the gist of what I'm saying is that it's definitely possible for reversed wires to cause an arbitrary problem like you're having and it'd be worth your while to switch them and see what happens.
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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: slamdaccord
Date Posted: May 28, 2008 at 7:27 PM
i wish there was a way to completely disable the factory oem alarm/keyless. reason i wanna do this is because, let's say someone "jimmys" the door and opens it, not only does viper go off, but oem as well, the horn honk IS hooked up to my viper but since the oem is going off, it honks slow, and it flashes my headlights, to which i have hid's in and i don't want to end up burning out the ballast. but someone told me the oem alarm is connected to my ecu/bcm and i couldn't disable it b/c it would love up something. is this true? or is it at all possible? if it was guaranteed to not mess with my BCM i would do it so i wouldn't deal with this headache anymore
Posted By: slamdaccord
Date Posted: May 29, 2008 at 9:46 AM
slamdaccord wrote:
i wish there was a way to completely disable the factory oem alarm/keyless. reason i wanna do this is because, let's say someone "jimmys" the door and opens it, not only does viper go off, but oem as well, the horn honk IS hooked up to my viper but since the oem is going off, it honks slow, and it flashes my headlights, to which i have hid's in and i don't want to end up burning out the ballast. but someone told me the oem alarm is connected to my ecu/bcm and i couldn't disable it b/c it would love up something. is this true? or is it at all possible? if it was guaranteed to not mess with my BCM i would do it so i wouldn't deal with this headache anymore
didnt know there was a curse filter. sorry. where it says "love up", i mean screw up
Posted By: slamdaccord
Date Posted: June 04, 2008 at 11:01 PM
just a little update on this.. so far so good! i haven't switched the arm/disarm wires...so far everytime i've hit disarm or remote start, not once has the oem alarm gone off. i haven't attempted to use the window roll up/down just because i have no point to but somethin tells me if i do that, it will set it off...the only time i will really use window up is if my car is somewhere and its about to rain and i dont feel like running to it
Posted By: enice
Date Posted: June 05, 2008 at 2:15 PM
I've had a similar issue..the solution that I came up with was giving the factory disarm wire 2 ground pulses instead of 1. I even tested the car when it went off and gave it a ground pulse and it still didnt disarm it. Until i gave it 2 pulses did it work 100% off the time.... This was also because I used the extended door locks(window roll up and down)
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