DTC B2477, Reverse Relay Shorted To Ground: Testing
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.
If DTC B2477 is set, check for short to ground in Dark Green wire between PZM connector C2 terminal D3 and reverse relay (located in trunk #5 micro relay center).