For 1990-2009 cars only
BCM Scan Tool Data Definitions
The BCM Scan Tool Data Definitions contains a brief description of all Horn related BCM parameters available on the scan tool.
Horn Relay Feedback: The scan tool displays Active or Inactive. When the BCM energizes the horn relay, the scan tool will display Active. When the BCM de-energizes the horn relay, the scan tool will display Inactive.