Control Module

Faults that occur during operation of top are stored in CVM. They are accessed with DIS Tester or MoDiC. For possible fault codes stored in CVM, see Fig 1.

Fig 1: Control Module Fault Code Definitions
Courtesy of BMW OF NORTH AMERICA, INC.
Diagnostic requests (status) and component activation function provides quick diagnostic checks of signal status and output function of components. Always verify control module identification against tester display screen when testing or troubleshooting EM top system.
Always check any associated or inter-connected systems when troubleshooting EM top problems (i.e.: ZKE IV). Check coding data to ensure control module is coded correctly for specific top system in vehicle. Always use latest software available to test and troubleshoot system.

Fig 2: Automatic EM Top Control Module Flow Chart
Courtesy of BMW OF NORTH AMERICA, INC.