the car will beep when it is reset.
you may need to clean the contacts behind the buttons with some isopropyl alcohol.
also you must stand really close to the car to reset it. lock the doors, hold both buttons (L & UL) for as long as it takes for the car to beep once.
1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black -daily