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1982 240D, 1986 560SL, 1987 560SEC, 1990 300SE, 2002 E320, 2002 SA 500SL, 2005 S500, and others
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Discussion Starter #1
My 2005 S500 remote door locking system just works in the IR mode (and poorly at that) with no RF function. The batteries in both key fobs are new and the radio reception in AM and FM is fine.

Based on my searches and reading here, the issue is likely the amplifier that gets its signal from the rear antenna. The antenna would seem fine since I have no radio reception issues. It may just be a loose connection but the consensus seems to point to the amp.

As I understand it this amp in under the headliner at the top of the rear glass. Has anyone attempted this repair or have removed the headliner for any other reason? It seems like a pain to remove so I’m looking for pointers from anyone that has done it.

Thanks,
John
 

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Outstanding Contributor - Always Remembered, RIP
Zotye Auto 1.5T T600 2016
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52,804 Posts
It is a huge job to get to this unit, I would look for an indie or specialist with SDS and run the diagnostics on this first off, I would not want to do all this work and find the connections are ok, then still need sds to test the amp.
 

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