Mercedes W203 Sometimes EZS and central locking not working
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  1. #1
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    Default Mercedes W203 Sometimes EZS and central locking not working

    Hello,
    I have here a Mercedes W203 with a strange problem.
    Sometimes you insert key on EZS / EIS and it will not recognize. Then you take out key and insert again and it works.
    Same thing with the central locking. Sometimes it work, sometimes it doesnīt work.
    Car has 2 keys. Same behavior with both.
    Original EZS is 2035450108. This EZS is usual problem on this cars.
    So, I read eeprom on both processors inside EZS and wrote eeprom contents inside another similar EZS part number 2035450608.
    With the EZS I programmed the behaviour is exactly the same.
    After that I already open both keys, change batteries, solder all key inside, check fuses, check battery car,...

    I think that on w203 EZS and central locking are different systems, right ? So, why I have both problems...

    Also, on diagnostic I donīt have error codes on any system.

    Thanks for your help.

  2. #2
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    wissamshaat's Avatar
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    Default

    did you checked esl?

  3. #3
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    If your W203 EZS is with HC08 mask 4j74y mask probably there is chip fault.
    You better check EZS and ESL on the bench , there can be CAN fault also .

 

 

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