Diagnostic Fault Information
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Does Not Communicate with Low Speed GMLAN Device
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Low Speed GMLAN Serial Data | 1 | 21 | 1 | - |
| Ground (DLC, Terminal 5) | - | 1 | - | - |
1
An open between the data link connector (DLC) and C 203 will only effect the communication with the scan tool. The vehicle modules will still communicate.
|
||||