Air Bag Systems

DTC B1001

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 VINs 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.

TEST DESCRIPTION

Step 1 - Step 11:

The numbers below refer to the step numbers on the diagnostic table.
2. This step checks to see if the correct VIN is programmed in the PCM.
4. This step checks to see if the BCM has been replaced.
5. This step explains the proper steps to perform after a BCM has been replaced in order for the BCM to operate properly.
6. This step checks to see if the correct VIN is programmed in the BCM.
7. This step explains how to properly program the VIN into the BCM.
8. This step checks to see if the SDM has been replaced.
10. This step explains how to properly setup the SDM and BCM.