VXman,
I suspect that the diagnostic procedure has been initiated. Looking at my notes I would check the operation of the diagnostic switch refferred to as the DRS switch, the switch in the running mode should be locked in the central position.
DD is displayed if any items involves any problem and fails DD is also displayed when diagnostics is started without removing the fuses line fuse and pump fuse in this case diagnostics is prohibited from going to the first step.

Regards Titus