Remember, there is an oval plastic hole plug in the back end of the door below the level of the handle. This can be removed and there is a three prong plug for the wiring going to the switch in the lock cylinder. You can have a quick look through this hole to see the wiring without taking the door panel off.

Good luck! I know you can find the problem!

Scott@lajollaaudio

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The Mercedes Specialists Since 1986