Testing the Serial Data Circuits for a Short to Ground
WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the appropriate harness connectors at the following components:
- All low speed serial data splice packs
- Any module or component between that may be between the splice packs
- 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 ground. If the circuits test normal, replace the control module that causes the short to ground when connected.