The customer reports that the alarm goes off for no reason. The passenger door control module, J387 (address word 52), has software version 0273 ? only this version is affected. Measuring value blocks 21-24 in the Comfort system central control module, J393 (address word 46), indicate the last alarm source. A value of 1, 2 or 3 is stored as the last alarm source. Incorrect coding/parameterization of the passenger door control module.