Originally Posted by
onehundred80
The AA is the non beeping module when locking/unlocking the car, the AB beeps.
The difference in price is basically two times for the beeping one. The AA is now obsolete, a few may be around though. If you dig one up on eBay you may get one that is a few days from failing.
I am going to put new batteries in my old non beeper before they leak as explained by ala-xfire and maybe sell it.
Do not buy the part using the Chrysler part numbers, use the Mercedes part number as it will be cheaper by far.
Are you positive on that? The first post in this thread says, in bold:
"IF YOU WANT YOUR CAR TO CHIRP, REPLACE YOUR SIREN WITH PART#5124443AA.
Again, IF YOU WANT YOUR CAR TO CHIRP, REPLACE YOUR SIREN WITH PART#5124443AA. "
Per the thread below, Mercedes part # 1718202526 will chirp whereas 2038203826 will not. The one that doesn't chirp is attached with a bolt and the one that does uses a nut.
W203 - Alarm Problem (Fixed) - Mercedes-Benz Owners' Forums
I'm curious about what a dealer would order/install if you took in your SL-class or Crossfire to have this part replaced, since there's such limited availability of the part numbers we have.
I'm willing to bet that we can find something aftermarket, or at least used more recently, with the same or a similar/adaptable connector. In the mean time, found MB #1718202526 on EBay and won with best offer of $35.