Date registered: May 2009
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Smart Key Problem
I got a problem with using my smart keys and while I have found a great many posts that talk about smart key issues, I have yet to see one that discusses the specific issues I am having. Here is what I know:
Info: 2003 C32 4-Door Sedan
Symptoms: After the car sits for a while 1+ hours the smart key fails to unlock/lock the car. After manually unlocking the car and placing the key in the ignition, regardless of whether I started the car or not, the key will work once again.
1. At first I thought it was the batteries in the key so I checked them. I also tried my spare key....the problem persisted with both keys, which points to the problem being in the car.
2. I thought I had an issue with the battery in the car. I had the charging system tested and it seems to be working fine.
3. I thought there could be a draw or short on the battery, so last night I record the battery voltage when I parked the car 12.87V, this morning I went out and checked the voltage to see how much it had been drained but it showed 12.47V.
4. Since the smart key works part of the time, I doubt it's the IR or RF antenna.
There is something wrong with the EIS or the receiver in the the car? Has anyone else experienced something like this?