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Mercedes C300: I have a 2010 c300 Mercedes Benz it want crank....all

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I have a 2010 c300...
I have a 2010 c300 Mercedes Benz it want crank....all the lights work and radio but no horn and new battery
Submitted: 1 year ago.Category: Mercedes
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Answered in 21 minutes by:
5/19/2016
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 5,083
Experience: 15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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Hello, there are quite a few issues that can cause this, sometimes we can figure this out without a scan tool, but keep in mind there is a possibility it may need towed to a shop. can you tell me how this started and if you replaced any parts?
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Customer reply replied 1 year ago
It started with the key not working at times..I would have to remove the key then lock and unlock the doors reinsert the key and the car would start
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
ok how many keys do you own?
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Customer reply replied 1 year ago
2
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
ok good and you tried both keys?
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Customer reply replied 1 year ago
same thing with both keys
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
ok, so open the fuse box cover on the driver side of the engine bay, turn the ignition key on, use a test light and test each fuse for power, if i am right you will have a good majority without power indicating circuit 15 (key on power) is NOT active. if this is the case we need to swap the circuit 15 relay with another relay to see if the relay is the issue, if not then the issue is the ignition switch. let me know what fuses do not have power and i can then check the diagram to confirm. Lou p.
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Customer reply replied 1 year ago
All fuse's were good
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
explain what you mean by good?
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Customer reply replied 1 year ago
No bad fuses all working they all light up
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
OK so far so good, next we need to swap the starter relay to see if it cranks. ill get you the location
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 1 year ago
ok the green relay is the starter relay when you pick it up on the fuse box you will see the letter M so you know you have the correct one. you need to use a test light and a small wire and make sure you have power at 2 of the 4 pins on the fuse block where the relay goes to ,
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Lou P. master tech
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 5,083
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Experience: 15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.

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