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R350 component B86/2, obstruction sensors

R-Class (W251) 2006-Present: R320CDI, R350, R420CDI, R500

R350 component B86/2, obstruction sensors

Old 09-01-2018, 07:11 PM
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2008 R350
R350 component B86/2, obstruction sensors

My power rear liftgate opens fine, but will no longer power-down. It just ignores all button presses. I've power-cycled the rear SAM, pulled fuses, and tried the big button on the rear door, driver's control and the remote. All of them just ignore the close command.
Reading codes with my icarsoft, I see these errors:
Component B86/2 (Right rear-end door closing obstruction sensor strip) sticks in the switched state (contact sticking)
Plus the same message for the other side (B86/1).

My searches of the car and the web have not turned up these sensor strips, or their locations. Has anyone found them and replaced them?
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Old 09-02-2018, 06:04 PM
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Old 09-02-2018, 11:46 PM
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This is what I had. Itís for a 2010 GL450. It might help you find the required parts.

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Old 09-03-2018, 12:27 AM
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2008 R350
Thank you, that's good information.

I found the sensor on the R350, it was well hidden. It's built in to a trim piece along the vertical edges, that goes from up around the hydraulics down the vertical. The sensor strip is along the edge, and stops as the tail light assembly. I was able to open the rear access panels and find the wire (two wire, with red connectors) and verify that the icarsoft detects it as "missing" when I disconnect it, and "triggered" when it is plugged in. Resistance is about zero ohms, so it looks to be shorted.

Part number is A2516900730 D-Pillar cover V/W251 with APS for the left one. Found one on ebay, may give it a try but I think I'll call the dealer first. If that price is similar to the above, I may just go new (if it is still available).
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Old 09-04-2018, 08:55 AM
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How about just disconnecting the sensor? Will the lift gate still work?
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Old 09-04-2018, 11:05 AM
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2008 R350
I did not try it, but I'd think it would not power down with a missing sensor. I could figure out the resistance of the good one and patch in a resistor, but wouldn't want to disable a safety device.
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