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Old 03-06-2015, 11:12 AM
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Join Date: Apr 2011
Posts: 5
1999 c230 Kompressor Software Bug?

About a week ago my keyfob did not work. Replaced batteries, keyfob, and it still did not work. All my fuses were good but I moved a couple around and the keyfob worked again but both front windows and side mirrors were not working.

Then I did a complete system reset, disconnected the battery, and everything started working again. This worked for about 2 days and this morning the drivers window and side mirror and not working but everything else is. Sound like some kind of software bug or issue....any ideas?


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Old 03-06-2015, 07:44 PM
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Join Date: Jan 2012
Posts: 7,515
Most everything on these cars ( 98 and up ) goes through CAN bus. Water or a failure in one of the modules can cause all sorts of issues. ( my C280 is a 97 so I can't offer any specifics )

The key fob will start the car even if the battery is missing, the bat is just there for remote locking / unlocking.
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Old 03-06-2015, 07:53 PM
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Join Date: Jan 2012
Posts: 7,515
Also, if the cars cranking battery is failing, it can scramble the fob. If cranking voltage drops too low, the challenge / response activity with the key does not complete leaving things in a limbo. The key must be replaced and if too many keys are issued, the EIS ( Electronic Ignition Switch , the place that you insert and turn the fob ) replaced unless you get a hold of a china e bay programmer.

I have had cranking batteries that would crank forever but drooped too far under a load. Rather than a 12 V battery they were a 10 due to a shorted cell.

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