Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) receives the VIN from the body control module (BCM) via the class 2 serial data circuit. The SDM receives also a message from the BCM containing its restraints ID. The restraints ID contains the last 4 digits of the SDM part number. The SDM compares the information stored in its memory with the information received from the BCM.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1001 Option Configuration Error
Conditions for Running the DTC
| • | The power mode is RUN. |
| • | The BCM and SDM are communicating on the Class 2 serial data circuit. |
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.
Action Taken When the DTC Sets
The following module specific actions may occur:
| • | The SDM commands the AIR BAG indicator ON via class 2 serial data circuit. |
| • | The SDM disables all deployment loops. |
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Diagnostic Aids
DTC B1001 is an indication that the restraints ID or the VIN stored in both the BCM and SDM do not match. If any of the modules mentioned above were replaced, the replaced module need to be reprogrammed for proper operation.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | Go to Step 2 | Go to Control Module References for the applicable Diagnostic System Check |
2 |
Is the DTC retrieved as a current DTC? | Go to Step 3 | Go to Step 7 |
3 | Was BCM or SDM replaced? | Go to Step 4 | Go to Step 5 |
4 | Follow the correct procedure to reprogram the module that was replaced. Refer to Control Module References for the applicable programming procedure. Did you complete the action? | Go to Step 7 | -- |
5 |
Does the DTC reset? | Go to Step 6 | Go to Step 7 |
6 |
Important: Perform the programming or setup procedure for the module, if required. Replace the module that set the DTC. Refer to Control Module References . Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 5 | System OK |
