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Parktronic two red lights and beep - SOLVED

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Parktronic two red lights and beep - SOLVED

 
Old 01-14-2019, 01:40 PM
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2007 Mercedes E350 Avantgarde
Parktronic two red lights and beep - SOLVED

Just thought I'd share this info it might help someone (doesn't just apply to W246 model).

My wife's 2013 model B180 has had an intermittent problem with the rear parking sensors where as soon as you would put it into reverse, two red lights show on the parktronic display and it beeps then the system turns off. This progressively got worse until it started happening everytime.

Mercedes in the workshop manual states that two red lights and NO beep is a malfunction (dirty or misaligned sensor), but two red lights WITH beep is a fault (bad sensor, wiring, control unit etc). So my wife's car had a fault.

I removed the rear bumper bar and found that where the parking sensor wiring loom connects to the car, moisture had got into the plug and corroded some of the pins (in particular, the ground wire).

I cut the plug off and directly soldered the wires to each other and now the problem is fixed!

Hope this helps someone


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