Diagnostic Fault Information
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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.
|
||||