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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  Tests for voltage at the coil side of the DEFOG relay. The HVAC fuse supplies power to the coil side of the DEFOG relay.
  2. 3:  Verifies that the BCM is providing ground to the DEFOG relay.
  3. 4:  Tests if ground is constantly being applied to the DEFOG relay.
  4. 5:  Tests for an open on the control circuit of the DEFOG relay.
DTC B0283

Step Action Yes No
Schematic Reference: Defogger Schematics 
Connector End View Reference: Stationary Windows Connector End Views 
1 Did you perform the Defogger Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Defogger 
2 
  1. Turn OFF the ignition.
  2. Disconnect the DEFOG relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the ignition voltage circuit of the DEFOG relay coil and a good ground.
Does the test lamp illuminate?		 Go to Step 3  Go to Step 9 
3 
  1. Connect a test lamp between the control circuit of the DEFOG relay and the ignition voltage circuit of the DEFOG relay coil.
  2. With a scan tool, command the DEFOG relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 7  Go to Step 4 
4  Does the test lamp remain illuminated with each command? Go to Step 6  Go to Step 5 
5  Test the control circuit of the DEFOG relay for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
6 Test the control circuit of the DEFOG relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
7 Inspect for poor connections at the DEFOG relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 10 
8 Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 11 
9 Repair an open or high resistance in the ignition voltage circuit of the DEFOG relay coil. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 12  -
10 Replace the DEFOG relay.
Did you complete the replacement?		 Go to Step 12  -
11
IMPORTANT: Perform the set up procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 Go to Step 12  -
12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Setting the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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