556U interfering w/ Viper 791?

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ampere

Member - Posts: 40

Joined: October 15, 2004

Posted: December 13, 2004 at 8:27 AM / IP Logged

This is officially the second Ford vehicle I've seen this problem in. When the car is remote started, sometimes (about 80% of the time), the remote fails to work afterwards. I can have it 3 inches away from the antenna and still nothing. I get the out of range icon. The moment the car start timer goes off, the remote is 100% functioning again!!!!!

Could the 556U (RF) security bypass be interfering with the remote's RF???

I am so confused!!!! Plz help!

meltingplastic

Copper - Posts: 225

Joined: November 08, 2004

Location: United States

Posted: December 13, 2004 at 2:44 PM / IP Logged

i can tell yuou that on my uncles 97 f150 that i put a remote start in... on the factory fob.. if the truck was running and you tried to use the keyfob.. it wouldnt do anything. so check to make sure where u are tapping in for lock and unlock... if the viper fov doesnt even let you stop the vehicle.. then i have no idea were to help you with that

Driving a Bagged, Caddied 02 s10

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ampere

Member - Posts: 40

Joined: October 15, 2004

Posted: December 13, 2004 at 3:40 PM / IP Logged

Unfortunately, the fob doesn't let me do anything. It's like it cannot communicate with the alarm brain at all. Sometimes if I press a button (arm or disarm) repeatedly for 15 seconds or so, it will work.

Any other ideas/suggestions I could try? Anything would help, thanks!

auex

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Posted: December 13, 2004 at 3:57 PM / IP Logged

Try and make sure that no part of the alarms antenna is anywhere near the box for the bypass. Also check the alarm's ground.

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kgerry

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Posted: December 13, 2004 at 4:19 PM / IP Logged

i've had a few weird vehicles like that....when running, something generates this weird RF blanket... last one i tracked down to it being the blower motor... it sounds like something is running on the same frequency.... you may want to buy an RF sniffer and put it to the test

Kevin Gerry

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ampere

Member - Posts: 40

Joined: October 15, 2004

Posted: December 13, 2004 at 4:21 PM / IP Logged

auex wrote:

Try and make sure that no part of the alarms antenna is anywhere near the box for the bypass. Also check the alarm's ground.

Thanks for the reply.

I made sure the antenna and it's wire is not routed anywhere near the box bypass.

The ground is good.

Is this theory of the security bypass affecting the remote even a plausible idea? I mean, could there technically be some RF interference?

meltingplastic

Copper - Posts: 225

Joined: November 08, 2004

Location: United States

Posted: December 13, 2004 at 4:24 PM / IP Logged

did you try using the fob when started with the key.. not the remote start... that way the 556u wouldnt be activated and would tell you if it possibly has something to do with the 556u unit

Driving a Bagged, Caddied 02 s10

ampere

Member - Posts: 40

Joined: October 15, 2004

Posted: December 13, 2004 at 4:29 PM / IP Logged

kgerry wrote:

I am going to turn on/off a number of different components and report back shortly.

ampere

Member - Posts: 40

Joined: October 15, 2004

Posted: December 13, 2004 at 4:29 PM / IP Logged

meltingplastic wrote:

did you try using the fob when started with the key.. not the remote start... that way the 556u wouldnt be activated and would tell you if it possibly has something to do with the 556u unit

I'm going to try this and report back shortly.

ampere

Member - Posts: 40

Joined: October 15, 2004

Posted: December 13, 2004 at 4:40 PM / IP Logged

ampere wrote:

kgerry wrote:

I am going to turn on/off a number of different components and report back shortly.

Well I tried it a few times with evey component I could think of turned off, HVAC, Radio, any lights, and i still have the same problem.

I think my next step might be to get a RF sniffer.

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