Joe,
When you say not coded - what do you refer to? This is a pre-bus W140 chassis model. The part number of the pump matches and old and new look alike, at least externally. I've simply plugged it into the wiring loom as it was before.
If a bladder had gone on one seat, would both lumbar supports be inoperable or just the one? They both don't work at present .
Dr Richard Williamson