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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEMIRRORSSTATIONARY WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0283TEST DESCRIPTION
2006 Chevrolet Suburban K2500, 6.0 U

Test Description

2006 Chevrolet Suburban K2500, 6.0 USECTION Test Description

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 Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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 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 Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
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
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.