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Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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:  Listen for an audible click when the DEFOG 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 DEFOG relay. The HVAC fuse supplies power to the coil side of the DEFOG relay.
  3. 4:  Verifies that the BCM is providing ground to the DEFOG relay.
  4. 5:  Tests if ground is constantly being applied to the DEFOG relay.
  5. 6:  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: Window Systems Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Select from miscellaneous test, the Rear Defogger from the body control module (BCM) output controls.
  3. With a scan tool, command the DEFOG relay ON and OFF.
Do you hear a click when you command the DEFOG relay ON and OFF?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  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 4  Go to Step 10 
4 
  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 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 DEFOG relay for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
7 Test the control circuit of the DEFOG relay for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
8 Inspect for poor connections at the DEFOG relay. Refer to Testing for Intermittent Conditions 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 BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
10 Repair an open or high resistance in ignition voltage circuit of the DEFOG relay coil. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 13  -
11 Replace the DEFOG relay. Refer to Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center) .
Did you complete the replacement?		 Go to Step 13  -
12 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
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 Setting the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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