Circuit Description
When the ignition is first turned ON, the inflatable restraint sensing and diagnostic module (SDM) compares the restraints ID stored in the SDM to the restraints ID stored in the body control module (BCM). The restraints ID being compared contains the last four digits of the SDM part number. The SDM then compares the vehicle identification number (VIN) stored in the SDM to the VIN stored in the BCM. For more detailed information concerning the class 2 data lines, refer to Data Link Communications Description and Operation in Computer/Integrating Systems .
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1001 Option Configuration Error
Conditions for Setting the DTC
| • | Ignition 1 voltage is within the normal operating voltage range. |
| • | The restraints ID stored in the SDM does not match the restraints ID stored in the BCM, or the VIN information stored in the SDM does not match the VIN information 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 indicator via Class 2 serial data. |
| • | The SDM disables all AIR BAG deployments. |
Conditions for Clearing the DTC
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
When the SDM detects that no DTCs are present, the SDM commands the AIR BAG indicator OFF.
Diagnostic Aids
DTC B1001 is an indication that the restraint IDs 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 or powertrain control module (PCM) were replaced, the replacement modules need to be reprogrammed for proper operation. In addition, if the BCM or SDM were replaced, the vehicle theft deterrent (VTD) system will also need to be reprogrammed.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step checks to see if the correct VIN is programmed in the PCM.
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This step checks to see if the 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.
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This step checks to see if the SDM has been replaced.
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This step explains how to properly program the Vehicle Theft Deterrent (VTD) System.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Is the PCM programmed with the correct VIN? | -- | Go to Step 4 | Go to Step 3 | |
3 | Use the scan tool and/or the techline machine to program the correct VIN into the PCM. Did you complete the programming procedure? | -- | Go to Step 11 | -- |
Was the body control module (BCM) replaced? | -- | Go to Step 5 | Go to Step 6 | |
Program the BCM in order for the BCM to learn the restraints ID from the SDM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems. Did you complete the programming procedures? | -- | Go to Step 10 | -- | |
Use the scan tool to 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 | |
Program the correct VIN into the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems. Did you complete the reprogramming procedure? | -- | Go to Step 10 | -- | |
Was the SDM replaced? | -- | Go to Step 10 | Go to Step 9 | |
9 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | -- |
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Important: Use the scan tool to perform the VTD relearn. Do not use the 30 minute manual procedure. Reprogram the vehicle theft deterrent (VTD) system. Refer to Programming Theft Deterrent System Components in Theft Deterrent. Did you complete the reprogramming procedure? | -- | Go to Step 11 | -- | |
11 |
Are all SIR components properly mounted and connected? | -- | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | -- |
