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DTC U1300, Class 2 Short To Ground: Notes

WARNING: This page is about a different car, the 1997 Cadillac Seville, 1997 Cadillac Eldorado, and 1997 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To identify wire colors and components on Class 2 serial data line, see appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.

When PZM is energized, it monitors Class 2 serial data line for a short to ground. DTC U1300 will set when PZM determines Class 2 serial data line is shorted to ground for 10 seconds or more. PZM will then use default values. DTC U1300 will clear when PZM determines Class 2 serial data line is no longer shorted to ground.