Self-Diagnostic System: Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Instrument panel cluster may set Diagnostic Trouble Codes (DTCs) under certain conditions. These DTCs may be retrieved using a scan tool. Other conditions which may set a DTC is a loss of serial data communication with one or more modules on Universal Asynchronous Receiver/Transmitter (UART) data line. These DTCs may be caused by an open or short in UART serial data line.