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My key fob wont work. It was giving me hard time to open the…

Customer Question
My key fob wont...

My key fob wont work

Mechanic's Assistant: Have you checked the fob's battery?

Yes. It was giving me hard time to open the vehicle but last night stop working. I change the battery and I can see the red light when I push the keys. I can also see the infra red light working inside the fob key.

Mechanic's Assistant: What is the model/year of your Mercedes?

I call a locksmith and they open the car for me but now the security system lock the stering whel

Mechanic's Assistant: What year is your Mercedes?

2007 Mercedes C230

Mechanic's Assistant: Are you fixing your C230 yourself? What have you tried so far?

I also check fuse No. 8 on the trunk and its fine.

Submitted: 9 months ago.Category: Mercedes
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Answered in 11 minutes by:
11/16/2017
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 5,760
Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago

Hey how are you, I will try to help you with this issue, if the battery died in the fob it will trigger the anti theft system but since you replaced battery now we need to RESET the system and hopefully when it wakes up it will see new battery and should work if no other issues in the system

Master reset Procedure

1- Disconnect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if battery cables don't reach .

2- Hold cables Together for 60 secs ,then let go

3- Wait 30 minutes

4- Make sure all doors are closed

5- Reconnect battery Cables

6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)

7- Enter the vehicle and attempt to start

lets start here and we go from there

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 9 months ago
Thank u. Ill do that but I cant lock the doors because the key fob wont work and I dont have the blade key. I can close the doors but they would remain unlock. It thats ok ?
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago

actually , the driver door part is important , where the blade we need the blade system has to see that lock close and open, but try it if not fix that lock

You are very welcome :)

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Customer reply replied 9 months ago
Hello sir. I didnt work. The system anti theft system wont let me crank/start the car. The key fob still dont work.
Customer reply replied 9 months ago
Hello sir. It didnt work. The anti theft system wont let me crank/start the car. The key fob still dont work. I can see the red light on the remote but wont open/close the car. I check all the fuses and they good. Please advise.
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago
At this time we need a star mercedes scanner to retrieve fault codes or we will be guessing
But in a lot cases resyncimg fob using correct scanner should do it but we need to have it scanned
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Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 5,760
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Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles

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