Testing the Serial Data Circuits for a Short to Ground
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 GMC Savana Special, 2010 GMC Savana Camper Special, 2010 GMC Savana, 2010 Chevrolet RV Cutaway, and 2010 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the appropriate harness connectors at the JX 200 splice pack.
- Test for infinite resistance between the DLC serial data circuit terminal 1 and ground.
- If not the specified value, repair the short to ground.
- Ignition OFF for 60 seconds, test for greater than 100 Ω between each serial data circuit at the splice pack and ground.
- If less than the specified range, perform the appropriate test listed below:
- Serial data circuits with one control module, test the serial data circuit for a short to ground. If the circuit tests normal replace the control module.
- Serial data circuits with 2 or more control modules, test each section of the serial data circuit for a short to voltage. If the circuits test normal, replace the control module that causes the short to ground when connected.