Circuit/System Verification
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.
- Ignition ON, observe the scan tool brake controls Trailer Brake Relay Status parameter. The reading should be Enabled or Disabled.
- Ignition ON, observe the scan tool brake controls TBCM Command Duty Cycle parameter. The reading should be 0-100 percent.