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Wanted to see if I could repair my CLK320 Siren as it makes no noise. I saw the word Ni-MH on the case so figure why not open it up and see if I can just replace the internal battery. Well, this is what I found. The board shows major damage, even some of the chips are melted. Why would MBZ even design an internal battery model anyways? Anyways, this siren is toast.
2009 SL550 Roadster Diamond White, 2008 CLK550 Coupe Obsidian Black
This is a very common issue. They definitely did not design this properly as these issues happen way too often. From what I can guess, the battery is designed to run the siren even if the power to the vehicle is cut thereby still getting attention and annoying the would-be thieves (At least that's how the aftermarket ones I have operate). A lot of times this siren even causes battery drain issues when they start malfunctioning.
Hi MPDano, just some feedback from my experience so far.
My alarm siren started acting up and after researching this forum decided to disconnect and remove the alarm siren and disassembled it only to find relative mild acid corrosion on both sides of the circuit board. Using a toothbrush and soapy water I thoroughly scrub it clean and left it in the sun to dry. To determine whether the circuit board was still ok, I removed the old Varta batteries and I hooked up one set of 3x AAA in series(4.5V) and one set of 2x AAA(3V) in their place. Tested the alarm and it worked!! In the mean time I have sourced a replacement set of Varta batteries, around $25 for both(South Africa), and as soon as I get it, I will report back. I am including some pictures below.
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.
