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Home >> GMC >> 2002 >> Yukon Denali >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Horns >> Horn System >> Diagnostic Information and Procedures >> DTC B2752 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Listen for an audible click when the horn relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  Tests for voltage at the coil side of the horn relay. The HORN fuse supplies power to the coil side of the horn relay.
  3. 4:  Verifies that the body control module (BCM) is providing ground to the horn relay.
  4. 5:  Tests if ground is constantly being applied to the horn relay.
DTC B2752

Step Action Yes No
Schematic Reference: Horns Schematics 
1 Did you perform the Horns Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Horns 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the horn relay ON and OFF.
Does the horn relay turn ON and OFF with each command?		 Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the horn relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the battery positive voltage circuit of the horn relay coil and a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 10 
4 
  1. Connect a test lamp between the control circuit of the horn relay and the battery positive voltage circuit of the horn relay coil.
  2. With a scan tool, command the horn relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 8  Go to Step 5 
5  Does the test lamp remain illuminated with each command? Go to Step 7  Go to Step 6 
6 Test the control circuit of the horn relay for an open. Refer to CIRCUIT TESTING or WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
7 Test the control circuit of the horn relay for a short to ground. Refer to CIRCUIT TESTING or WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
8 Inspect for poor connections at the horn relay. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS .
Did you find and correct the condition?		 Go to Step 13  Go to Step 11 
9 Inspect for poor connections at the harness connector of 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 13  Go to Step 12 
10 Repair the battery positive voltage circuit of the horn relay coil. Refer to WIRING REPAIRS .
Did you complete the repair?		 Go to Step 13  -
11 Replace the horn relay.
Did you complete the replacement?		 Go to Step 13  -
12
IMPORTANT: Perform the BCM programming procedure when replacing the BCM.
Replace the BCM. Refer to BODY CONTROL MODULE REPLACEMENT .Did you complete the replacement?		 Go to Step 13  -
13
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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