While technically referring to a short circuit where current bypasses the intended load, mechanics use this phrase colloquially to describe any dead electrical component. It frequently serves as a vague explanation given to customers or service advisors when a technician lacks the diagnostic skills or tools to pinpoint the actual wiring fault. True electrical shorts usually blow a fuse or melt wires, rather than just causing a module to stop communicating.
The new guy said the body control module is shorted out, but he didn't even check the ground wire.
If a mechanic says a module is shorted out without explaining which circuit blew a fuse, they are likely guessing.
Related terms
Wiring harness
An organized bundle of insulated electrical cables and connectors that routes power and data throughout a vehicle.
OBD
On-board diagnostics is the standardized computer system that monitors vehicle emissions and engine performance.
Body control module
A central computer that manages a vehicle's electronic chassis and interior accessories.