Body Control Module
DTC B1001Circuit Description
After enter RUN mode, the inflatable restraint sensing and diagnostic module (SDM) and Radio receive the VIN from BCM, via class 2 serial data circuit. SDM receives also a message from BCM containing its restraints ID. The restraints ID contains the last four digits of the SDM part number. The modules compare the information stored in their memory with the information received from the BCM.
Conditions for Running the DTC
The voltage and ground for the modules involved, plus a normal operating Class 2 serial data circuit are required.
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 either the SDM or Radio 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.
- The SDM disables all deployment loops.
- The radio does not function and displays as many characters of the word "CALIBRATE" as will fit on the display.
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 stored in both the BCM and SDM do not match or that the VIN stored in the BCM does not match the VIN stored either in SDM or in radio. If any of the modules mentioned above were replaced, the replaced module need to be reprogrammed for proper operation.
