BenzWorld Junior Member
Date registered: Oct 2009
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Parasitic Battery Drain Solved!
It took a while but patience paid off.....
After going through the procedure of checking each fuse for battery drain it showed that when fuse #8 was removed the drain dropped from 130ma down to 20ma. This took quite a while though - probably 5/10 minutes for the system to stabilise but it was evident that something positive was happening as there was an immediate reduction of drain after the fuse was removed. The fuse info sheet indicated that #8 was allocated to "convenience locking, anti theft alarm and remote trunk release". It occurred to me that I had not heard the alarm siren for a year or two and frankly hadn't thought much about it - UNTIL NOW!
So the next step was to find the alarm, isolate it and check the drain. Easier said than done.....lots of false starts here. After looking behind the fog lamps etc. it was found exactly where Keyhole described "behind the REAR wheel arch panel on the RHS, which in my case being in British Columbia was on the passenger side of the car.
I unbolted the alarm, disconnected it and Shazam! draw dropped to 20ma after about 5 minutes.....
The alarm is supposedly a sealed unit and I needed a hacksaw to cut the seam through to split the unit in half. There was the problem staring me in the face...a totally corroded the circuit board - so much for being sealed...
I have spent a lot of time in coastal Mexico so I imagine it was the salt air that somehow got into the unit and hastened the corrosion. No I will not replace it...I just taped up the connections and put the panel back. So ends dozens of hours of poking, probing, rolling around on the garage floor, replacing fried multi testers etc. etc. Rewarding though - the local Stealership wanted $113.00 per hour and said there were no estimates what it might cost - they had just had a similar problem (that was a defective locking system) and they billed 10 hours for that!'
The old alarm module? Well it might wind up on the Christmas tree!
Thanks everyone for your help!