Control module. MODULES. PartQualifier: type 1. PartQualifier: type 2. PartQualifier: type 5. type 1. An electronic Control unit that monitors and Controls various electronic systems in a vehicle's body, and communicates with other on-board computers via the car's vehicle bus. Diagnostic Test Connector. Body Computer (BCC). Central Timer (CTM). Diagnostic Test Connector. Generic Electronic (GEM). Interface.