Circuit Description
When the ignition key is first turned to the RUN position, 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 IPC. 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 powertrain control module (PCM). For more detailed information concerning the Class 2 data lines, refer to Data Link Communications Circuit Description in Data Link Communications.
Conditions for Setting the DTC
| • | Ignition 1 voltage is within the normal operating voltage range. |
| • | The restraints ID that is stored in the SDM does not match the restraints ID that is stored in the IPC or the VIN information that is stored in the SDM does not match the VIN information that is stored in the PCM. |
This test is only run once during power up initialization.
Action Taken When the DTC Sets
| • | The SDM sets a DTC B1001. |
| • | 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 IPC and the VIN information that is stored in the SDM matches the VIN information that is stored in the PCM.
Diagnostic Aids
DTC B1001 is an indication that the restraints ID's stored in both the IPC and SDM do not match or that the VIN's stored in both the PCM and SDM do not match. If either the IPC 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.
-
This step checks to see if the correct VIN is programmed in the powertrain control module (PCM).
-
This step checks to see if the instrument panel cluster (IPC) has been replaced.
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This step explains the proper steps to perform after the IPC has been replaced in order to properly synchronize the IPC and the SDM.
-
This step checks to see if the Restraints ID that is stored in the IPC matches the Restraints ID that is stored in the SDM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Is the PCM programmed with the correct VIN? | -- | |||
3 | Use the scan tool and/or the techline machine to program the correct VIN into the PCM. Is the programming procedure complete? | -- | -- | |
Was the IPC replaced? | -- | |||
Follow the instructions on the scan tool under the IPC SPECIAL FUNCTIONS to synchronize the IPC and the SDM. This allows the IPC to learn the Restraints ID from the SDM and also to learn other important data that is required. Is the synchronization procedure complete? | -- | -- | ||
Use the scan tool to verify that the Restraints ID that is stored in the IPC matches the Restraints ID that is stored in the SDM. The Restraints ID that is stored in the IPC consists of the last four digits of the SDM part number. Does the Restraints ID that is stored in the IPC match the Restraints ID that is stored in the SDM? | -- | |||
7 |
Is the repair complete? | -- | -- | |
8 |
Are all the SIR components properly mounted and connected? | -- | -- |
