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Discussion Starter #1
I have a 95 W124 E220 Saloon. There are 2 problems which have really started to get to me and it seems that not even mercedes benz dealers or "specialists" have a clue about these.

1) First problem is with the rear headrests. When the engine is off, you can lift the rear headrests and they will click into place. There is a button on the centre console panel which if pressed, releases the headrests and they retract. Even with the engine running, the rear passengers should be able to pull up the headrests and it will click into place. The problem I have is with the engine on, there is no "click" if you lift the headrests and just flops back down again. When the engine is off and you lift it, it will click into place and stay up. When you turn the engine on, automatically it will just flop down again without even pressing the retract button on the centre console. Any one have any ideas as to why this is happening?

2) Second problem lies with the aerial. Its electric so when you switch the radio on, its supposed to go up and when you switch it off, its supposed to go down. My one just doesnt go up when you switch the radio on so I went to a MB dealer to ask why. I was told I needed a whole new aerial including the motor. So went ahead and purchased one. I fitted it in myself correctly making sure everything was as it was on the previous one. Alas I face the same problem, whole brand new aerial and when you switch the radio on, it picks up signals (very poorly) but doesnt come out! Any one have any ideas?

Would appreciate the help on this one guys as im all out of ideas and steam now :(
 

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In the headrest case the answer is fairly obvious. The solenoid assembly used to direct engine-generated vacuum to the headrest release servos is defective. The solenoid should allow vacuum to pass only when you depress the console switch. Apparently the solenoid is stuck in the energized position so vacuum reaches the heqadrest servos as soon as the engine starts.
The solenoid is located under the rear seat cushion on the left side (at least on USA cars). I'd post a pic but can't access my site right now.
The other possibility (remote) is that the switch on the console is somehow defective and therefore keeping the solenoid energized. This is unlikely since it would a) drain the battery and b) probably melt the solenoid.

Antenna thoughts later.
 

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Discussion Starter #3
Thanks for the advice augapfel, that really is helpful and way more than any MB dealers could help me out with. If you can try and post a pic of the solenoid then that would be great as I could try and locate it on my car and replace it and see if it possibly works. It would be pretty unlikely that the switch itself is defective since ive never opened the console. All I have done is replaced the stereo with a new one and I dont remember pulling or yanking any wires.

If you do have any thoughts about the aerial then it would be great to hear from you again.

Thanks
 

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You just mentioned a key element with the antenna problem. You replaced the head unit. Most of the modern ones have a separate hot lead for the antenna. You might go back through the installation instructions to see if something has been missed in the process. It should connect to the provided factory lead.

Good Luck,

Jayare
 
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