Horn Inoperative in Content Theft Deterrent (CTD) Alarm Mode

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views
1	Did you perform A Diagnostic System Check - Theft Deterrent?	Go to Step 2	Go to Diagnostic System Check - Theft Deterrent
2	Perform one of the following to activate the CTD Alarm Mode: Operate the PANIC button on the keyless entry transmitter. Complete the following steps: Open the driver's window. Lock the vehicle using the power door lock switches. Wait for the SECURITY telltale to turn off. Reach in and unlock the driver's door. Open the driver's door. Do all of the alarm mode functions activate (lights flash and horn pulses)?	Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS	Go to Step 3
3	Are only the horns inoperative?	Go to Step 4	Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative
4	Operate the horns from the horn pad. Do the horns operate properly?	Go to Step 5	Go to HORNS INOPERATIVE
5	Test the control circuit of the horn relay for an open between the body control module (BCM) and the horn relay. Refer to CIRCUIT TESTING Did you find and correct the condition?	Go to Step 8	Go to Step 6
6	Inspect for poor connections at the body control module (BCM). Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS . Did you find and correct the condition?	Go to Step 8	Go to Step 7
7	Replace the BCM. Refer to BODY CONTROL MODULE REPLACEMENT . Did you complete the replacement?	Go to Step 8	-
8	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3