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

Claim 17:
18. A trailer interface module comprising:
a first output for providing a first voltage to a first trailer light;
a second output for providing a second voltage to a second trailer light;
a memory for storing a trailer light test algorithm and a trailer light test parameter;
an input for detecting a transmission park state; and
a processor for detecting a change in a current to at least one of the first output and the second output and for performing the trailer light test algorithm according to the trailer light test parameter and in response to the detection of the change in the current and the transmission park state having a park condition and for discontinuing the trailer light test algorithm in response to the transmission park state having a non-park condition and 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 change in current to at least one of the first output and the second output.