Patent ID: 11933830
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 8:
9. An apparatus for testing a trailer light system comprising:
a trailer connector for coupling a first voltage to a first trailer light and a second voltage to a second trailer light;
a transmission state detector for determining a vehicle transmission state; and
a trailer interface module for detecting an electrical connection to a trailer at the trailer connector, and for initiating a trailer light test algorithm and applying the first voltage to the trailer connector and the second voltage to the trailer connector in response to the detection of the electrical connection and the vehicle transmission state being in a park state and discontinuing the trailer light test algorithm and applying the first voltage to the trailer connector and the second voltage to the trailer connector in response to the vehicle transmission state not being in the park state wherein the first trailer light is illuminated in response to the first voltage following a duration of time greater than five seconds after the detection of the trailer connection.