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Is it the immobiliser?

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by DougMb, Jan 13, 2020.

  1. DougMb

    DougMb Active Member

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    Location:
    Tunbridge Wells
    Your Mercedes:
    Cls 320 diesel 2006
    When i try to start my Cls for the first time it turns over but won't start until you take the key out lock it and unlock it and then it will start. i don't have the problem starting for the rest of the day .
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    UnMercs BMW i8 Volvo XC90
    Sorry you’re not getting any replies so far...maybe this will prompt !
    Your message to me confirmed you’d checked key fob batteries and car batteries were ok, saves someone else asking!
    Have you more than one key, forgot to ask that bit....?
     
    DougMb likes this.
  3. OP
    DougMb

    DougMb Active Member

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    Joined:
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    Location:
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    Your Mercedes:
    Cls 320 diesel 2006
    Key fob batteries are fine and have tried it with the spare key as well batteries are fine in that as well. Both car batteries are also good. just been out this morning and instead of taking the key out and locking and unlocking it i just turned the ignition on and off three times and it started fine. I had a new set of glowplugs installed not long ago so it cant be that. Maybe the relay module could be at fault ?
     
  4. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    I'd be more inclined to suggest the electronic ignition switch is failing.
     
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  5. OP
    DougMb

    DougMb Active Member

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    How would I test that
     
  6. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    You'd need diagnostic kit to view the live data to see if drive authority is granted and that the signal from the key is correct.
     
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  7. John Laidlaw

    John Laidlaw Senior Member

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    Indeed sounds like EIS now you’ve confirmed , have you a Mercedes independent you’re using yet to get the diagnostic LK mentions ?
     
  8. OP
    DougMb

    DougMb Active Member

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    Not at the moment.
     
  9. John Laidlaw

    John Laidlaw Senior Member

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    AMF Dartford is a forum sponsor on here, Alex regularly contributes - excuse my geography if too far
     
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  10. OP
    DougMb

    DougMb Active Member

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    Your Mercedes:
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    Thank you John.
    I've been reading that it's better to get them repaired then get a new one because you don't have to reprogram then.
     
  11. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
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    Before repairing anything have it correctly diagnosed by looking at codes and live data.
    Diagnose, don't pay through the nose.
     
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