On my 06 E320 CDI, I have not been able to detect any rhyme or reason why sometimes I can push and hold the unlock button on the remote and open all the windows and sometimes I can't. It's inconsistent with both keys (good batteries in both). And, yes, I'm aware that I need to be close to the door.

Thoughts?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife