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W211 estate RF remote not locking/unlocking

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Andyn666, Dec 15, 2017.

  1. Andyn666

    Andyn666 Active Member

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    Joined:
    Aug 11, 2017
    Your Mercedes:
    2003 W211 E320 CDI estate
    Hi,

    I have a 2003 Eclass and today the remote lock/unlock stopped working. The fob will work using the ir sensor but not the RF.

    I have checked fuse 8 and it is fine, I even changed it incase I couldn't see the break. I assume it is the antenna amp that has stopped working as the radio signal has dropped off too.

    I have removed the antenna on the c pillar, A2118202989, all looks fine on the inside.

    I have all so removed what looks like an existing, 2118200885, from under the right side of the boot floor. I don't know what this part does but it was so hot I couldn't touch it. Does anyone know what this part does and if it could be my faulty part?

    Thanks in advance
    Andy
     
  2. LostKiwi

    LostKiwi Senior Member

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    Joined:
    Aug 25, 2006
    Location:
    Midlands / Charente-Maritime
    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500, 04 Smart Roadster Coupe
    Won't be that - it's the Bluetooth control module.
    Most likely it's your key - have you tried the other key?
     
  3. OP
    Andyn666

    Andyn666 Active Member

    Messages:
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    Joined:
    Aug 11, 2017
    Your Mercedes:
    2003 W211 E320 CDI estate
    I've checked the radio signal from both keys and there both working fine, why would I have a Bluetooth module when the car doesn't have Bluetooth? I have a phone harness in the arm rest that works but no bluetooth?

    It's definitely at the car end, and I'm assuming the antenna as the radio signal has gone to pot at the same time, that's assuming they both work off the same aerial
     
  4. OP
    Andyn666

    Andyn666 Active Member

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    Joined:
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    Your Mercedes:
    2003 W211 E320 CDI estate
    I thought I would update this post incase anyone else has the same issue.

    My problem was with the aerial amplifier that is located behind the head lining on the left side D piller of the car. After testing everything I found three was no continuity in one of the 3 power inputs to the amp.

    On the back of the fuse box in the boot there is a green plug with the same colour wires as going to the amp (Red/yellow, Pink/blue and Grey/yellow). In may case the red/yellow wire was at fault, I put a new write in from fuse box to amp and all functions note work perfectly again costing me nothing but a little time.
     
    mersum1es and Frosty149 like this.
  5. John Laidlaw

    John Laidlaw Senior Member

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    Joined:
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    Location:
    Wirral
    Your Mercedes:
    W212 E63 ///AMG V8 Biturbo Volvo XC90 2018
    Great work Andy and thanks for the feedback
     
    Andyn666 likes this.

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