Diagnostic Aids

The keyless entry antennas must be installed correctly for proper performance. The precise location and orientation are important for the antenna to have the range and shape of range designed for each antenna location. There is a possibility that the passive entry system set a false DTC due to the antenna being incorrectly installed.

A voltage is supplied on the circuit number 3274 while the vehicle is asleep so the system can remain active to respond to a button press of a transmitter. This is how the system remains available after the vehicle is inactive and asleep. If any fault were to occur on the circuit that allowed a path to ground only after the vehicle is asleep then the system would function as normal under all conditions except when the vehicle is asleep. In that case simply touching the door unlock button on the vehicle or operating a handle would wake the vehicle up and allow normal operation even though the short to ground is present.

Unwanted or inadvertent door lock/unlock activation may be requested by the OnStar® Remote Link app. It is possible that a customer may be unaware of account usage, resulting in an unwanted or phantom door lock/unlock. If normal system diagnosis results in an inability to verify the customer's concern, contact Technical Assistance Center (TAC).