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Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 20598
Experience:  BEng hons Mech engineering, in auto industry 22 years
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2oo3 clk mercedes battery is flat. Stick key in key fob

Customer Question

2oo3 clk mercedes battery is flat. Stick key in key fob won't unlock door.how do I open car to open the bonnet?
Submitted: 3 months ago.
Category: UK Car
Expert:  Matt replied 3 months ago.

Hello

A flat battery means you can't get the deadlock or alarm system to release its grip

I'd start by charging the battery you should be able to do this via the cigarette lighter / accessory socket. You'll need the appropriate attachment for your charger but car accessory shops sell these- Alternatively if you can't get into the car the other way to do this is jack the car up so you can get under the front.

Locate the starter motor and the large power cable that runs to it - connect the positive battery charger lead to this terminal

then connect the charger negative lead to the metal of the engine block

This should complete the charging circuit and get some power into the battery allowing you into the car

Expert:  Matt replied 3 months ago.

Hi

do you still need help?

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