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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:  Tests for the normal state of the hatch release switch using a scan tool. The scan tool will display the normal state as INACTIVE, and ACTIVE when the switch is activated.
  2. 3:  Tests if the BCM is able to detect a change in hatch release switch state. The scan tool will display the normal state as INACTIVE, and ACTIVE when the switch is activated.
  3. 4:  Tests for a stuck or shorted hatch release switch. If the hatch release switch is stuck or shorted, the state will change from ACTIVE to INACTIVE when the hatch release switch is disconnected.
  4. 5:  Tests for a short to ground in the hatch release switch signal circuit.
  5. 8:  When the BCM is replaced, use a scan tool to perform the BCM RPO Reprogram procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
DTC B2573

Step Action Yes No
1 Did you perform the BCM Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Body Rear End 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Hatch Release Switch parameter in the BCM data list.
Does the scan tool display INACTIVE?		 Go to Step 3  Go to Step 4 
3 
  1. Activate the hatch release switch.
  2. With the scan tool, observe the Hatch Release Switch parameter.
Does the Hatch Release Switch parameter change state?		 Go to Diagnostic Aids Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the hatch release switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Hatch Release Switch parameter.
Does the scan tool display INACTIVE?		 Go to Step 7  Go to Step 5 
5  Test the signal circuit of the hatch release switch 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 10  Go to Step 6 
6 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 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the hatch release switch. 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 10  Go to Step 9 
8 
IMPORTANT: Perform the BCM RPO Reprogram procedure. 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 10  -
9 Replace the hatch release switch. Refer to Rear Compartment Lid Switch Replacement (Domestic)  or Rear Compartment Lid Switch Replacement (Export) .
Did you complete the replacement?		 Go to Step 10  -
10
  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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