Guaranteed it's one of the two splice packs for data communication. They are brought together in those two shorting combs to enable troubleshooting a data comm problem. When you have a single bus that goes to the same wire and then ALL AROUND the vehicle to each of the intelligent modules, a wire short or bad module in any one place can take down the entire vehicle. To troubleshoot that sort of problem, you take out the shorting comb, then use a meter to check the wire in the connector that fans out to the modules for being shorted to ground or held at 5V. If you have none of that, then you can add one module at a time back into the circuit by using wires, or the ol' "Scotch Tape on one finger of the comb at a time trick" to isolate possibly bad circuits or modules.
Old engineering trick to troubleshoot a shared signal bus.