Usually a manufacturer will install the cable hook up in a compartment on the left side that runs to the media center. Then perhaps a cable to any outside TV hook up in a right side compartment. The coax for rear TV probably runs in the overhead, not underneath. You might use a signal tracer to determine how much of the coax is good and cut and install a connector to attach a new section of coax to reconnect the signal from cable hook up to media center.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI