Diagnostic Aids
WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition is turned ON, the K36 Restraints Control Module (RCM) performs tests to diagnose critical malfunctions within itself. When the RCM has completed the power-up mode, the module will establish communication with other related modules. The module will set DTC U3000, and communicate with other related modules that an internal fault DTC has been set.