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Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2:  Listen for an audible click when the RR 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 RR DEFOG relay. The HVAC fuse supplies power to the coil side of the RR DEFOG relay.
  3. 4:  Verifies that the BCM is providing ground to the RR DEFOG relay.
  4. 5:  Tests if ground is constantly being applied to the RR DEFOG relay.
  5. 6:  Tests for an open on the control circuit of the RR DEFOG relay.
DTC B0432

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 ON the ignition, with the engine OFF.
  2. Select from miscellaneous test, the Rear Defogger from the BCM output controls.
  3. With a scan tool, command the RR DEFOG relay ON and OFF.
Do you hear a click when you command the RR DEFOG relay ON and OFF?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the RR DEFOG relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test between the Ignition 3 voltage circuit of the RR 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 RR DEFOG relay and the Ignition 3 voltage circuit of the RR DEFOG relay coil.
  2. With a scan tool, command the RR 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 RR DEFOG relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
7 Test the control circuit of the RR 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 13  Go to Step 9 
8 Inspect for poor connections at the RR 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 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 in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
10 Repair an open or high resistance in Ignition 3 voltage circuit of the RR DEFOG relay coil. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 13  -
11 Replace the RR DEFOG relay.
Did you complete the replacement?		 Go to Step 13  -
12
IMPORTANT: Perform the set up procedure for the Body Control Module (BCM).
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.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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