How do I troubleshoot the AV-400?

Step-by-step guidance for diagnosing the most common AV-400 field issues — from a single non-responsive unit to a full crosswalk that won't flash.

Issue-specific troubleshooting

Button pressed — local unit flashes but remote unit (other side of crosswalk) does not

Check that the battery voltage is around 12V or higher.
Check that the antenna is securely attached to each solar engine and is not damaged.
System must be power cycled if channel is changed while system is powered on.
The systems are all factory set to channel 0. Channel settings are used to allow multiple crosswalks in close proximity to operate independently of each other.

Button pressed — remote unit flashes but local unit (same pole as button) does not

Check that the battery voltage is around 12V or higher.
To determine if there is an issue with the lightbar connection of the system local to the push button, disconnect and reconnect the main power harness to the controller. The system should start with an initiation flash pattern of 20 seconds. If this does not occur, there is an issue with the lightbar(s), wiring, or controller. Disconnect the main harness, then disconnect both light bars. Disconnect the bridge wire from one lightbar to the other. Connect just one lightbar to the lightbar harness from the solar engine and then reconnect the main harness. Repeat this process for the second lightbar if applicable. If the connections are secure the lights will flash as soon as the main connector is connected.

Button pressed — no lights flash on either unit

Check that the battery voltage is around 12V or higher.
Check that dial 2, the lightbar setting is set at one of the lightbar settings. If it is set to position #4, No Lightbar, it will not flash. This setting is used for a wireless push button application. Ensure that the main harness is disconnected before making any setting changes.
To isolate any potential issues with the push button, disconnect the main harness, then (if iNX is used) disconnect the iNX power harness from the battery to the iNX, then disconnect iNX harness from the iNX. Disconnect the LED wire from the lightbar.
Disconnect the lightbars, and reconnect just one lightbar with no bridge wire, ensuring that each wire is inserted correctly into the connector. Connect the main harness. If the lightbar is wired correctly the initiation flash pattern will occur. Repeat these steps with the second lightbar (if applicable). To test the push button functionality, first touch the push button wires together. This should activate both systems.