Circuit Description
When you first turn ON the ignition, the inflatable restraint sensing and diagnostic module (SDM) compares the restraints ID that is stored in the SDM to the restraints ID that is stored in the BCM. The restraints ID that is being compared contains the last four digits of the SDM part number. Next, the SDM compares the VIN that is stored in the SDM to the VIN that is stored in the BCM. For more detailed information concerning the Class 2 data lines, refer to Data Link Communications Circuit Description in Data Link Communications.
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The restraints ID that is stored in the SDM does not match the restraints ID that is stored in the BCM or the VIN information that is stored in the SDM does not match the VIN information that is stored in the BCM. This test is only run once during power up initialization.
Action Taken When the DTC Sets
| • | The SDM commands ON the AIR BAG warning lamp via Class 2 serial data. |
| • | The SDM disables all deployments. |
Conditions for Clearing the DTC
The restraints ID that is stored in the SDM matches the restraints ID that is stored in the BCM and the VIN information that is stored in the SDM matches the VIN information that is stored in the BCM.
Diagnostic Aids
DTC B1001 is an indication that the restraints ID's stored in both the BCM and SDM do not match or that the VIN's stored in both the BCM and SDM do not match. If either the BCM and/or PCM were replaced, the replacement modules need to be reprogrammed for proper operation.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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This step checks to see if the correct VIN is programmed in the powertrain control module (PCM).
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This step checks to see if the body control module (BCM) has been replaced.
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This step explains the proper steps to perform after a BCM has been replaced in order for the BCM to operate properly.
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This step checks to see if the correct VIN is programmed in the BCM.
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This step explains how to properly program the VIN into the BCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | Go to Step 2 | |
Is the PCM programmed with the correct VIN? | -- | Go to Step 4 | Go to Step 3 | |
3 | Use a scan tool and/or the techline machine to program the correct VIN into the PCM. Did you complete the programming procedure? | -- | Go to Step 9 | -- |
Was the BCM replaced? | -- | Go to Step 5 | Go to Step 6 | |
Follow the instructions on the scan tool under the BCM SPECIAL FUNCTIONS to reprogram the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. This allows the BCM to learn the Restraints ID from the SDM and also to learn other important data that is required. Did you complete the programming procedure? | -- | Go to Step 9 | -- | |
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. Is the BCM programmed with the correct VIN? | -- | Go to Step 8 | Go to Step 7 | |
Follow the instructions on the scan tool under the BCM SPECIAL FUNCTIONS to program the correct VIN into the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Did you complete the programming procedure? | -- | Go to Step 9 | -- | |
8 |
Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Did you complete the action? | -- | -- |
