Output Driver: Testing and Inspection

AllData Editor Note

Little or no quad driver testing was supplied by the manufacturer.
The engine module decides when to turn each switch of the driver "ON".

Even though some models will set codes, in the end, if you want to check the driver itself, you'll need:
1. To use a scantool to command the suspected driver switch to energize (ground) the circuit, while checking with a test light,
2. To operate the vehicle in a way that should cause the suspected portion of the driver to switch "ON".

On the up side, since the early 90's, most driver load circuits utilized circuit breakers. This protected most drivers and engine models from burning up when the circuit was overloaded.