viper 5901

Hi, since i want to install the antenna module in the back of the car and the brain module in the front i need to extend the factory 6 wire cable. I don't need led nor the button on that antenna module, so i'm guessing i only need to extend the wires what feed the antenna. Can someone perhaps know the pinout? The best option for me would be removing those two antennas and hooking up an external 900mhz gsm antenna but as far i've learned its not a plug and play job. any advices appreciated, thanks.

How far do you need to extend it and how long is the wire now? Personally I wouldn't f with it. If the wire is too long it won't work reliably or at all. Alarm manufacturers also warn against shortening it, which can produce the same issues. Changing the antenna itself is a whole 'nother bag of worms. A 900Mhz GSM antenna is only good on the 900Mhz GSM cell phone band, so if your remote isn't a cell phone the antenna would perform poor at best.

Thanks for your response. I didn't measure the original DEI cable but i would need like 6 meters and the DEI one is definitely shorter, maybe 3 meters. I thought for digital transmission the length shouldn't matter. The instructions manual only states not to wind the excess of the cable because it might create some interference.     Don't know maybe i will install the brain unit at the back too then.

Is it digital transmission? How about moving the alarm brain?

In digital transmission it all depends on what communication protocols are being utilized and what voltages the system is running at. Some setups are very tolerant of tripling the cable length, others have issues. If you really need the antenna at the back you can try it out. It won't fry anything, unless you get the wires crossed. IMHO it's alot of work for not much benefit. From an aesthetic stand point, the rear view mirror typically conceals the antenna. Only way I'd bother trying extending the antenna to the back is if a customer was paying me at least $100 to make it happen.

I agree 100% with catback, seems like a lot of effort for not much return. I have done this on some vehicles, Porsche 911 and MR ll spring to mind although note the vehicle layout and I've gone for an under seat position for the brain, gives me the option of front or rear.

X3 with howard and catback!  Besides no real benefits, i don't believe rthat unit has inputs for off board led and valet switch! Could be awful discomforting in the event of system failure!commit your way to jehovah and he will act in your behalf. psalms 37:5

i was planning to hide an antenna inside the 3rd stop light at the rear window, it seems like a great spot. I just don't like the general idea of placing the antenna with an alarm disable button in a visible place on the windshield, especially with that led blinking. Well maybe i will mount it under the dash but the reception will drop probably.

Behind your rear view mirror is a great spot! The led faces the exterior and kinda makes it look like those bmw's with the factory system that has the led to the rear or the rear view!  Do this only of your rear view has an arm from the celing and not stuck onto the windshield, this way the cable is concealed behind the arm and shield it with a couple inches of 1/4" loom!commit your way to jehovah and he will act in your behalf. psalms 37:5

it took me two days to figure out why the engine dies right after remote started.    For some reason Viper 5901 activates: H1/12 ORANGE (-) 500mA GROUND WHEN ARMED OUTPUT right after the engine is started with a remote, even if its unlocked, with a door open, thus it was cutting off my fuel which i previously separated with a relay.    Anybody else also run into this issue?    why does it ground H1/12 wire after remote start, even if its unarmed?