This Lippert control unit replaces the electronics on pre-IMGL/9510 Kwikee step control systems, built for RVs using the 5323 and 5327 magnetic door switches (normally closed).
It's designed to fit step units manufactured between 1999 and 2005, giving you an OEM-correct way to bring a non-responsive electric step back into service without replacing the whole step assembly. Cross-referenced as Kwikee part 909506003/90951003.
Order this when your Kwikee electric step stops responding but the step mechanism itself is still sound.