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R230 (2003) RF Central Locking + Keyless Issue

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by C A R S E, Apr 10, 2018.

  1. C A R S E

    C A R S E Senior Member

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    Hi,

    Hope someone can give me some needed help, please :(

    Symtoms:
    • Keyless Entry/Start (KG) NOT Working - 'Key Not Recognised' appears on dashboard
    • Remote Locking (RF) NOT Working - Cannot Lock/Unlock car at any distance
    • Infrared Locking (IR) is Working, I am able to Lock/Unlock the car if I point the key(s) directly at the IR sensor(s) on the door handles (Where Boot, Doors and Petrol Cap all lock/unlock), which means the PSE pump is working.

    So far I have:
    1. Replaced main battery in boot
    2. Charged Battery under bonnet (Was more or less already fully charged)
    3. Replaced batteries in both key fobs
    4. Checked all fuses (With 12v light tester)
    5. Tried a couple of steps to sync the keys (Not sure if any of them were correct)
    6. Connected to STAR, where there was no errors shown, however the '750 CGW. N93 (Central Gateway, Control unit)' was shown as 'NOT PRESENT' ??? (Not sure if this is normal or not)
    7. Disconnected both batteries (overnight) in the hope a shutdown of the system resolved it
    8. Unplugged all SAN connectors (Located behind drivers seat) one by one
    9. Tested all other electrics in the car and everything else works including the alarm.
    The car had been stored in the garage most of the winter, so cant be caused by a water leek (Boot and inside car is bone dry).

    My first thought is what links the KG and RF systems, are the reliant on each other if so what components do they share?

    Thanks in advance :)
     
  2. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Kg uses the same rf as the normal locking so if rf doesn't work then Kg won't either.

    Get it on star, and check to see if the key rf is being received, if not then suspect key or antenna amplifier.
     
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  3. OP
    C A R S E

    C A R S E Senior Member

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    Thanks for confirming RF and KG are linked.

    I did get it on a STAR but I dont think that was checked, might be wrong. There wasnt any errors shown I know that much.

    Sounds like I might need to get it plugged in again, I didnt realise that could be checked.
     
  4. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    You can check whether key signal is being received and whether its the right signal for the car so can test whether the key is outputting rf or if the antenna isn't receiving it.
     
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  5. LostKiwi

    LostKiwi Senior Member

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    Also check both keys (assuming you have two RF keys).
     
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  6. LostKiwi

    LostKiwi Senior Member

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    What year is the car?
     
  7. OP
    C A R S E

    C A R S E Senior Member

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    Thanks.
    It's a 2003 SL55.
     
  8. LostKiwi

    LostKiwi Senior Member

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    Do you have the KG built into the key or is it a separate credit card?
     
  9. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    03 should be all in one key
     
  10. OP
    C A R S E

    C A R S E Senior Member

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    One key has both KG And RF all in one.

    My second key has only ever worked with RF
     
  11. LostKiwi

    LostKiwi Senior Member

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    Here's a description of the KG system:
     

    Attached Files:

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  12. OP
    C A R S E

    C A R S E Senior Member

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    Thanks will
    Thanking you kindly.

    This doc refers to:
    • Remote control key, purpose/design/function GF80.57-P-4101R
    • Keyless go control module, location/purpose/design GF80.61-P-4104R
    • Keyless go antenna, location/purpose/design/function GF82.62-P-4100R
    If possible would you be able to send me these :)
     
  13. LostKiwi

    LostKiwi Senior Member

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    If I have them. That was from Malcolms library of documents.
     
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  14. LostKiwi

    LostKiwi Senior Member

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  15. OP
    C A R S E

    C A R S E Senior Member

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    Doh!

    When I click on any of the links, I get prompted for a user name and password to log on :(

    Thanks anyways was worth a try :)
     
  16. OP
    C A R S E

    C A R S E Senior Member

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    Malcolm help me out a few times, he was a very kind and knowledable guy.
     

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