Remove Bumper <br>Remove Passengerside Headlight <br>Remove Passengerside Fender <br>Its hidding right there <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <p>Thats at least where the car alarm siren is ...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>baxteR</b> »</i></TD></TR><TR><TD CLASS="quote">Holy crap <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> you have to do all that? What exactly is its purpose?</TD></TR></TABLE><p>Its the alarm when someone breaks into your car it goes off . <p>But the module .... not sure where that is but IIRC when the module goes bad the door locks and central locking doesnt work . <p>But I think there both the same but not 100%
My siren internal electronics got fried and I've heard others having the same problem. Mostly 01s I think. The symptoms you get are<p>- Alarm Triggered message for no reason<br>- Sunroof sometimes don't close<p>If you leave the windows down, lock your car and reach in to open the door without the alarm going off. I think that is also a symptom this is bad.<p>As for fix, no need to remove fender. Basically remove passenger side tire, drill out 5 rivots, pull the wheel liner back, use dremel tool and cut a slot for flat head screw driver on the security bolt, disconnect electrical plug and remove. More details in the link below. Scan down and find "Alarm Service, Alarm Triggered...."<p><A HREF="http://www.freewebs.com/howardsvolvos/electricalelectronics.htm" TARGET="_blank">http://www.freewebs.com/howard...s.htm</A>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Chilled Man</b> »</i></TD></TR><TR><TD CLASS="quote">then why / who says you need a new one and whats not working ? </TD></TR></TABLE><p>BVV says I need one. I get a message every time I start the car (Alarm system service required). I still don't know what it does. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0">
The task of the control module is to supply the car with the siren sound. The siren control module can activate the siren noise in three ways:<p>- The central electronic module transmits information via the controller area network to the upper electronic module to deploy the alarm. The upper electronic module transmits information via serial communication (Volcano Lite) to the siren control module, which starts the siren.<p>- The siren control module has an integrated battery which is used as a backup in the event of an alarm. The battery charges via an integrated charger. The siren control module monitors the power supply from the car battery to the control module. If the voltage from the car battery suddenly stops (open circuit in cable) the siren is activated.<p>- The siren control module monitors the communication cable from the upper electronic module (life pulse) and if the communication ceases the siren is activated.<p>The siren control module transmits information about the status of the internal battery to the UEM via serial communication.<p>Or something to that effect...
The siren module obviously has either reported a problem to the UEM or stopped communicating. That's about as much as can be deduced. <p>Try tripping the alarm, and if you don't hear the siren you probably want a new one.
I get same message. Battery has been going dead. Another posting said the computer is trying to charge the battery in the alarm module and thus draining the starting battery. Every once in a while alarm works, so battery must take partial charge. I'm not locking car at the moment, after three calls to AAA. Installing new module next week. Stupid that the siren battery is not sealed and replaceable.
Backup battery in the module gets fried & leaks acid onto the circuit board. This board communicates with the sunroof module & causes problems with the roof & locks. <p>check this: <A HREF="http://www.matthewsvolvosite.com/forums/viewtopic.php?f=11&t=17479&hilit=siren+module" TARGET="_blank">http://www.matthewsvolvosite.c...odule</A>