The MircoMount Extreme Range (MMER) traffic signal preemption transmitter is equipped to give the user real time feedback on the operation of the vehicle's preemption system. Diagnostic features are available to the user only when the MMER is installed according to the Complete Installation Diagram (see Wiring Diagrams). The MMER sends specific flashing sequences to an installed panel lamp or illuminated switch to display diagnostic information to the user. Diagnostic codes include:

Rapid Double Flash - This diagnostic sequence indicates that the MMER is not supplying sufficient power to the strobe emitter. The most likely cause is because the power supply to the MMER is insufficient for proper operation. Check that the proper size wires (see Wiring Harness - Individual Wire Identification) have been used to supply power to the unit and that the vehicle's electrical system is working properly.

Rapid Triple Flash - This diagnostic sequence indicates that the strobe emitter is failing to operate properly. As strobes approach or reach their operational life, failure to flash (or discharge) is a common occurrence. Replace the strobe emitter to correct the problem.

Rapid Quadruple Flash - This diagnostic sequence indicates that both failure modes listed above have occured (rapid double flash and rapid triple flash). Check the power supply to the MMER and replace the strobe emitter.

Constant Rapid Flashing - This diagnostic sequence indicates that the MMER has temporarily suspended operation due to extreme temperature and has entered High Temperature Disable Mode (see Modes of Operation). This diagnostic will occur regardless of whether the MMER in the Disable mode or not