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Test Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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 battery positive voltage at the coil side of the dear window defogger relay. The BATT MAIN 3 fuse supplies power to the coil side of the REAR WINDOW DEFOGGER relay.
  2. 3:  Tests the control circuit side of the REAR WINDOW DEFOGGER relay for faults that cause DTC B0283.
  3. 4:  Listen for an audible click when the REAR WINDOW DEFOGGER relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  4. 5:  Verifies that the BCM is providing ground to the REAR WINDOW DEFOGGER 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. Remove the REAR WINDOW DEFOGGER relay.
  2. Connect a test lamp between the REAR WINDOW DEFOGGER relay BATT main 3 fused voltage supply circuit and ground at the REAR WINDOW DEFOGGER relay socket.

    Refer to Circuit Testing in Wiring Systems.

  3. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?		 Go to Step 3  Go to Step 8 
3 
  1. Turn OFF the ignition.
  2. Test the control circuit of the REAR WINDOW DEFOGGER relay for a short to battery positive voltage and ground. Refer to Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 4 
4 
  1. Connect a test lamp between the BATT main 3 fused voltage supply circuit and the control circuit of the REAR WINDOW DEFOGGER relay socket.
  2. Turn ON the ignition, with the engine OFF.
  3. Using a scan tool, command the relay ON then OFF.
Does the test lamp turn ON and OFF?		 Go to Step 6  Go to Step 5 
5  Test the control circuit of the REAR WINDOW DEFOGGER relay for an open. Refer to Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
6 Inspect for poor connections and terminal damage at the relay socket. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
7 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 11  Go to Step 10 
8 Repair the short to ground, poor connection or an open in the BATT 3 fused voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 11  -
9 Replace the REAR WINDOW DEFOGGER relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
Did you complete the replacement?		 Go to Step 11  -
10 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 11  -
11
  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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