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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 numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Tests for the normal state of the door lock/unlock 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 DDM or PDM is able to detect a change in a door lock/unlock 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 door lock/unlock switch. If a door lock/unlock switch is stuck or shorted, the state will change from Active to Inactive when a door lock/unlock switch is disconnected.
  4. 5:  Tests for a short to ground in a door lock/unlock switch signal circuit.
DTC B2236-B2239

Step Action Yes No
Schematic Reference: Door Control Module Schematics 
Connector End View Reference: Power Door Systems Connector End Views 
1 Did you perform the Door Systems Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Door Systems 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the appropriate door lock/unlock switch parameter in the appropriate door control module Inputs data list.
Does the scan tool display Inactive?		 Go to Step 3  Go to Step 4 
3 
  1. Activate the appropriate door lock/unlock switch.
  2. With a scan tool, observe the appropriate door lock/unlock switch parameter in the appropriate door control module Inputs data list.
Does the door lock/unlock switch parameter change state?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the appropriate door switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the appropriate door lock/unlock switch parameter in the appropriate door control module Inputs data list.
Does the scan tool display Inactive?		 Go to Step 7  Go to Step 5 
5  Test the appropriate signal circuit 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 appropriate door module. 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 appropriate door 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 Replace the appropriate door module. Refer to Door Control Module Replacement .
Did you complete the replacement?		 Go to Step 10  -
9 Replace the appropriate door switch. Refer to Front Door Switch Replacement .
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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