DTC B121C-13: Hard Drive - Circuit open: Action

NOTE: This DTC may be set even though no fault condition is present and should be ignored unless the customer has reported a navigation system concern. Clear the DTC and retest. Verify the customer concern prior to diagnosis

Clear the DTC and retest
Test the navigation system for correct operation
Using the manufacturer approved diagnostic system, re-configure the integrated audio module with the latest level software
Insert a CD and copy one track to the hard drive to confirm correct operation. Return vehicle to standard settings and delete the file
If the DTC returns, suspect integrated audio module internal fault