Date registered: Oct 2013
Vehicle: 2005 E320 CDI *black on black with nearly every option*
Location: Lansing Michigan
Mentioned: 19 Post(s)
Quoted: 195 Post(s)
Typically circuit boards dont short to POSITIVE, so due to the water intrusion problem these vehicles are known for near the rear sam, my thought was that water on the circuit board is causing the short between circuits.
So i took the rear SAM out last night to inspect for water, and sure enough, the rear SAM was WET, water all around sitting in the bottom of that well. i removed the board, cleaned the whole thing with electrical parts cleaner and a soft bristle brush, and dried it at 120f in the oven. cleaned the whole area out where the SAM sits, and put everything back together. Problem solved! No DTC's in the rear sam anymore. There was what looked like corrosion all over the board, but given how easily it cleaned off, i think it was actually mineral scale left behind from water intrusion. the board cleaned up very nicely.
trying to find where the water was getting in, im completely stumped. the tail light seal when removed was forming a perfect seal, and the sealing surface was dry and spotless. there WAS however water INSIDE the right side tail light. no visible signs of cracks or broken seals on the tail light housing, so i'm not quite sure where the water is coming in.
"Concentrated power is not rendered harmless by the good intentions of those who create it."
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