موصل مفصول

A connector left unplugged, or shaken loose, so the circuit is simply open. It deserves naming precisely because it is too obvious to check — a diagnosis reaches for a meter and a wiring diagram while the answer is visible from a metre away.

Recent work is the strongest predictor. A connector disturbed to reach something else and not refastened, a lock not clicked home, or one knocked off while another part was removed. A code that appears immediately after unrelated work, on a circuit near where that work happened, is this until proven otherwise — and the affected system is often nothing to do with the job that was done.

Vibration finishes what a poor refit starts. A connector pushed together without its lock engaged will hold for days and then part, so the fault appears long enough after the work for nobody to connect the two. Check that each connector's lock is actually latched rather than that it looks seated — the tactile click is the test, and a gentle pull confirms it.