U1300, Class 2 Short To Ground: Testing
WARNING: This page is about a different car, the 1997 Cadillac Catera. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect all modules on Class 2 serial data line. Using DVOM, check resistance between Data Link Connector (DLC) terminal No. 2 (Brown/White wire) and ground. If resistance is not infinite, go to next step. If resistance is infinite, repair short to ground in Brown/White wire between individual modules and BCM. Also check circuits to cellular phone (if equipped). Repair as necessary.
- If DTC U1300 is current and circuit is okay, replace BCM.