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Was told that I needed to replace the siren by a dealer. Don't think that they used the MB diag tool. Think that they thought it was drawing power.
Siren is a over designed thing that has 2 rechargable batteries sodereed onto a circuit board inside it's shell. Had the dealer install a new one.
Now, it intermittely sounds teh siren for no reason. It does not matter if the door is locked or not, happens independantly of the the doors being locked.
Was told that the sirens pop off randomly when teh internal batteries hit end of life.
Dealer can't tell me how long the new part sat on a shelf. Suspect that it sat so long that the batteried hit end of life.
Suggestions ?
Car is telling all my neighbors not to buy a mercades. It's popping off at night. Has does it at daytime too.
Does the MB diag tool keep sensor history ?
Does teh MB diag tool test the siren's internal battery state ?
Do not suspect that the shop guys know how to use the diag tool. ( Prefer not to go there at teh moment)
Is there a diag tool that I could get that could read the sensor histories that feed teh siren processing ?
Is tehre a fuse that I can pull that would shut the thing off?
Found that a fob's batter was reading 2.1 ( should be 3 something). Replaced it. Had a few days with no problems. Siren's going off again.
Am reading the links that others have suggested.
Reminds me of the issue with my W204 parking lights. If I have the switch set to Off the passenger side parking lights will turn on/off on there own randomly when parked at night. This seems to be due to a faulty light switch, the passenger side parking lights feature on the switch is right next to the Off, one click to the left.
I think you may have a faulty sensor that is randomly being triggered. I cant see if you said you scanned the car for any faults or maybe see if tells you which specific sensor was triggered?
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
