Van will not start because of remote alarm?

If the van won't start due to the remote alarm, it may be in a security lock mode that prevents ignition. Try using the key fob to deactivate the alarm or manually disarm it by following the manufacturer's instructions. If that doesn't work, check the vehicle's battery and connections, as a low battery can sometimes trigger alarm issues. If the problem persists, consulting a professional or the vehicle's manual may be necessary.