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Ask Lou P. master tech Your Own Question
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4814
Experience:  15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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My command knob on my C300 stopped working along with the

Customer Question command knob on my C300 stopped working along with the arrow buttons on either side. I can press the button down and it access Sirius XM. I had my battery replaced and it worked fine prior to that and became disabled after. Is there something simple we can check please?
JA: Have you tested the battery with a voltmeter? And can you see if it's leaking or not?
Customer: Battery is fine and was replaced by Mercedes service
JA: What year is your C300?
Customer: 2009
JA: Are you fixing your C300 yourself? What have you tried so far?
Customer: Have tried nothing so far...was looking online to see if there were any easy things to check for
JA: Anything else you want the mechanic to know before I connect you?
Customer: No, that is the only issue...thanks!
Submitted: 1 year ago.
Category: Mercedes
Expert:  Lou P. master tech replied 1 year ago.

Hello, if all worked before the battery was replaced then the controller may have just glitched, let me get you a fuse location to pull so we can see if we can reset it

Expert:  Lou P. master tech replied 1 year ago.

Hello, did you try to pull fuse 11 in the front fuse box? i dont see my last post where i instructed that, sorry if there was an issue, my computer was giving me issues i noticed some posts did not post :( let me know if you still need help or not . Lou P.