When either locking or unlocking my 1995 mercedes benz C220 both LED lights at the rear mirror and the front doors will flash simulteneously instead of one at a time. It usually use to flash red to indicate locking and green for unlock.
If it blinks alternately it means that the immobilizer is engaged and you will not be able to start your car.
That system is part of D.A.S. 2( driver authorization system verson 2). the lights in the mirror will blink red when lock and green when unlock. during the self diagnoses portion they will blink simutanilusly when the remote key batteries are low and alternating when there is a malfunction with the key or other part of the driver authorization. it sounds like your remote key central locking batteries are low.
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same issue :(
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