The Instrument Cluster Displays Various Check Control Messages This Service Information bulletin supersedes SI B61 21 15 dated March 2016.. The instrument cluster displays various check control messages. This includes messages for the PDC (Park Distance Control), DSC (Dynamic Stability Control) and windshield washer system. There can be many different fault codes stored in the vehicle. Signal invalid. The wiring harness below the micro filter housing (right front area of the bulkhead) is damaged from washer fluid leaking into the harness.