X2 on pressing the button RAPIDLY. On my 99 it doesn't seem to matter. On my 98, I tried and tried and tried and tried....nothing worked, until I pressed the button very quickly. This time it worked the first time!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife