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Old 09-15-2011, 09:36 PM   #1
ac_2007
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Cheap Alarm Solution! (Installation + Pics & Video)

A few days ago I stumbled upon the $5 lock beep thread here, and thought I would try something similar to substitute my vehicle not coming with a factory alarm. The installation is very easy and requires only 2 main components:

1) An alarm siren - I pulled mine off a vehicle at the junkyard for $10.
2) A method to program your vehicle to flash corners when locking/unlocking.







To prep, I extended the wires of my alarm siren with blue 24 gauge wire and used excess amounts of electrical tape to secure the connection







Next, I removed the cabin air filter, its cover, and its housing. There are 3 twist clips for the air filter and 4 T-30 Torx screws holding the housing in place. At this point you will also have to detach the bottom part of the wire casing to free the housing (pictured at the bottom).





After the housing has been taken out, you will encounter another HVAC air box panel, which is held in place by 2 T-30 Torx screws, one at each side. There may also be a twist clip present near the DME which needs to be removed.




Once you have removed the air box panel, start looking for the factory alarm harness. It will be located behind the drug bin, and most likely taped to a wire that leads behind the firewall. Hard to miss, once you find it, this is what it looks like:





The siren installation is next. I routed the blue positive/negative wires through a hole with a rubber plug located near the top of the drug bin. Simply remove the plug if you have one, if not, you can drill a hole (not recommended), or simply route the wire over the top and behind the rubber weather stripping.





Your positive wire should be connected to the top left hole, and negative in the bottom left hole as shown in the picture below (borrowed from tranceasia8)





After the connection is secure (I used an excessive amount of electrical tape, once again) tie back any loose wire to the original strand.





To keep the siren in place I positioned it on top of notch with a threaded hole, and found a bolt that fit the thread. My car has 3 of these notches in the drug bin.





The finished product






Now a video demonstration of my new cheap alarm. Hope this helps some of those who didn't want to spend hundreds of dollars on the OEM alarm!

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Old 09-15-2011, 09:45 PM   #2
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interesting and loud
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Old 09-15-2011, 10:27 PM   #3
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Excellent and thanks for sharing! I am going to give this a try once I can find a siren.

How did you activate the lights to flash?
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Old 09-15-2011, 10:20 PM   #4
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nice work
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Old 09-15-2011, 11:11 PM   #5
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Cool write up.
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Old 09-15-2011, 11:31 PM   #6
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nice work!
i wanna try out the Viper SmartStart with iPhone
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Old 09-15-2011, 11:44 PM   #7
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Great!
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Old 09-16-2011, 12:26 AM   #8
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after you have done this does the car need to be programmed?
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Old 09-16-2011, 01:18 AM   #9
ac_2007
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Yes, the car needs to be reprogrammed. There are very cost effective solutions that I can go in more detail only via PM.

I've added flashing high-beams and 4-ways with the alarm, which were not part of the video. There are many customizable options.
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Old 09-16-2011, 01:41 AM   #10
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the factory alarm system is fairly cheap installed and working...why not just go for that? it does a great job as well.
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Old 09-16-2011, 01:48 AM   #11
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Because this works just fine and costs a hell of a lot less
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Old 09-16-2011, 02:36 AM   #12
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another great thread by ac_2007
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Old 09-16-2011, 04:14 AM   #13
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Nice and loud

Was the siren from a salvaged e46? Do you know how loud the siren is in terms of decibels?
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Old 09-16-2011, 05:25 AM   #14
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Originally Posted by Apple4life View Post
Nice and loud

Was the siren from a salvaged e46? Do you know how loud the siren is in terms of decibels?
it's probably from another car, the oem e46 alarm looks a lot different
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Old 09-16-2011, 10:17 AM   #15
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Quote:
Originally Posted by Apple4life View Post
Nice and loud

Was the siren from a salvaged e46? Do you know how loud the siren is in terms of decibels?
eneka is right, the siren I used was pulled from a random car with an alarm system. I just based my decision on the fact that it was in good condition and single tone.


UPDATE: For those wondering what the setup options are (in the legitimate version of) PA Soft 1.4, I have taken a screenshot of my revised options which include the flashing high-beams and 4-ways not seen in above video:

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Old 04-04-2012, 01:37 AM   #16
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Quote:
Originally Posted by ac_2007 View Post
eneka is right, the siren I used was pulled from a random car with an alarm system. I just based my decision on the fact that it was in good condition and single tone.


UPDATE: For those wondering what the setup options are (in the legitimate version of) PA Soft 1.4, I have taken a screenshot of my revised options which include the flashing high-beams and 4-ways not seen in above video:

What are the central locking functions for ?
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Old 04-04-2012, 03:41 AM   #17
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Hi Guys,

I've got an RHD Australian 330i and can't find the cable. Does anyone know which side of the car the cable should be on in a RHD car? It might not be pre-wired at all, but I haven't given up yet.
My alarm connector was wrapped up in the same material as the wires in your picture. Don't remember exactly what it looked like, aside from the pictures on the first page. Check your trunk to see if you have those buttons that say "prewired for.."

Also, look up your car on realoem.com, choosing RHD. Then you'll be able to find out exactly which side the connector is situation at based on the diagrams.

Quote:
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What are the central locking functions for ?
I made my car lock/unlock all of the doors at once, instead of driver first then the rest.
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Old 04-04-2012, 06:50 AM   #18
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My alarm connector was wrapped up in the same material as the wires in your picture. Don't remember exactly what it looked like, aside from the pictures on the first page. Check your trunk to see if you have those buttons that say "prewired for.."

Also, look up your car on realoem.com, choosing RHD. Then you'll be able to find out exactly which side the connector is situation at based on the diagrams.
My car has no "prewired" tags in the boot at all. I don't think they did that with EUR/AU models.

I reckon I can do the bare minimum wiring by adding a new wire to the GM5 module (X254 pin 8) and feed it out of the firewall. Will it work?
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Old 09-16-2011, 07:04 AM   #19
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Good job OP.
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Old 09-16-2011, 08:31 AM   #20
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I have an extra siren lying around as well and have wanted to do this, but didnt want it to look non-stock. I was going to power the siren with a relay to make it even louder, but it seems like the stock wire output is good enough....
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