I like how you can open and close the windows in my car with the remote by using the lock/unlock buttons.. However the only time it works is when im 2 feet from the car... The lock and unlock feature for the door locks work from a very far distance but not the windows... any idea how i can correct this?

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2001 Mercedes-Benz C320 3.2
1991 Mercedes-Benz 300E 3.0