Test Description

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. 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.

2: Tests to see if the BCM or SDM has been replaced
3: Tests to see if the correct VIN is programmed in the PCM
5: Tests to see if the correct VIN is programmed in the BCM

DTC B1001

Step	Action	Yes	No
1	Did you perform the Diagnostic System Check - SIR?	Go to Step 2	Go to Diagnostic System Check - SIR
2	Was the body control module (BCM) or sensing and diagnostic module (SDM) replaced?	Go to Step 6	Go to Step 3
3	Install a scan tool. With a scan tool, verify that the powertrain control module (PCM) is programmed with the correct VIN by comparing the VIN that is stored in the PCM to the VIN plate of the vehicle. Does the scan tool indicate that the PCM is programmed with the correct VIN?	Go to Step 5	Go to Step 4
4	Use a scan tool and/or the techline machine to program the correct VIN into the PCM. Refer to Powertrain Control Module (PCM) Programming in Engine Controls. Did you complete the action?	Go to Step 8	-
5	With a scan tool, verify that the BCM is programmed with the correct VIN by comparing the VIN that is stored in the BCM to the VIN that is stored in the PCM. Does the scan tool indicate that the BCM is programmed with the correct VIN?	Go to Step 7	Go to Step 6
6	Follow the instructions on the scan tool to properly reprogram the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Did you complete the action?	Go to Step 8	-
7	Turn OFF the ignition. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement?	Go to Step 8	-
8	Use the scan tool in order to clear the DTCs. 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