The car in question is a 98 W210 wagon.

The feature that locks all doors when the car travels above 10mph has stopped working. The car will central lock using the Smartkey and using the dash switch.

I seem to recall (but could not find using search) a post that talked about a proceedure to reprogram the locking function of the Smartkey.

I would like to try this as a possible cure.

Thanks in advance.