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The fuse feeding a group of actuators, blown so several outputs lose power together. Modules commonly supply banks of actuators from one protected feed, which is why a single fuse produces a set of unrelated-looking codes — solenoids, valves and relays across different systems failing at the same moment.

That simultaneity is the diagnostic gift. Several actuator circuits reporting open at once is a shared supply, not several failed actuators, and it locates the fault immediately. The temptation is to work through the components one at a time, which is exactly the wrong approach here.

A blown fuse is a symptom. These do not fail with age; one of the actuators on the feed has shorted, or the harness has chafed to earth. Measure each actuator's winding resistance to find the outlier, and fit a new fuse only after that — a replacement into a short blows again and repeated attempts damage the wiring the fuse is protecting. Check what else shares the feed, since the failed component may be in a system nobody has complained about.