A constant current driver circuit is provided for a vehicle light assembly having a plurality of light strings arranged in parallel with each other. Each light string in the plurality of light strings includes at least one light emitting diode (LED) electrically coupled in series with an LED driver. The driver circuit includes a bias circuit, a voltage regulator circuit and a sense circuit. The bias circuit is electrically coupled to each LED driver at a common node and, in absence of a trigger signal, operates to supply a bias voltage to each LED driver. The voltage regulator circuit is electrically coupled to the common node and regulates the bias voltage supplied by the bias circuit. The sense circuit is configured to detect on/off state of the voltage regulator and, in response to detecting an off state for the voltage regulator, provides a trigger signal to the bias circuit.