GM Service Manual Online
For 1990-2009 cars only

The horns will operate anytime the horn switch is pressed. The horns will also operate when the following systems are enabled:

    • Remote lock/unlock verification function of the Keyless Entry system.
    • Pressing the alarm button on the keyless entry transmitter.
    • Remote lock/unlock function of the Keyless Entry system (if customized to do so).
    • Content Theft Deterrent system will operate the horns.

Diagnostic Trouble Codes (DTCs)

The BCM may set the following DTC related to the horn system.

DTC B2753 Horn Relay Coil Circuit High