SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Door lock question

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Old Feb 3, 2026 | 03:11 PM
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Reddog378's Avatar
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From: Estero FL
2011 SL550
Door lock question

My 2011 sl550 doors lock automatically when driving but will not lock with key fob which indicates a vacuum n or Pse issue. Are the systems not related? I don’t understand the difference.
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Old Feb 3, 2026 | 05:26 PM
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Frederick NL's Avatar
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From: Netherlands
2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
When the locks work, they work. You need to concentrate your search on your key fob and the car's signal receiver.
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Old Feb 3, 2026 | 05:52 PM
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From: Estero FL
2011 SL550
Originally Posted by Frederick NL
When the locks work, they work. You need to concentrate your search on your key fob and the car's signal receiver.
The lights flas when I push the button on the fob so I assume the connection is good
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Old Feb 4, 2026 | 06:58 AM
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'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
There are differences in what it is trying to lock. I believe that the auto lock when driving will only lock doors, while the fob may try to lock everything depending on settings. You probably have leaks on the central locking circuit.
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