The control module for the electronically locking differentials detects faults from input signal/messages, sensors, solenoids, and drivers/relays and report the corresponding Diagnostic Trouble Code (DTC).The lighting strategy for the axle lock switch.The FRONT LED willturn ON SOLID when the front axle is lockedturn ON BLINKING when the front axle is attempting to lockturn ON BLINKING when a lock front axle request is received but conditions to lock are not correctturn OFF when the axle is UNLOCKEDturn ON FAST BLINKING when there is a fault detected for the front axleThe REAR LED willturn ON SOLID when the rear axle is lockedturn ON BLINKING when the rear axle is attempting to lock turn ON BLINKING when a lock rear axle request is received but conditions to lock are not correctturn OFF when the axle is UNLOCKEDturn ON FAST BLINKING when there is a fault detected for the rear axleOhm meter set on continuity: One lead on each connector terminalSwitch Plunger IN Locker Not Engaged - No ContinuitySwitch Plunger OUT Locker Engaged - Continuity