Conditions for Running the DTC

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The device runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.
The keyless entry control module will set this DTC with symptom byte 39 when the keyless entry control module antenna is activated.