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 B2752 Horn Relay Coil Circuit Low

DTC B2753 Horn Relay Coil Circuit High