Restraint System Diagnosis

DTC B1001

CIRCUIT DESCRIPTION
When the ignition is turned ON the inflatable restraint sensing and diagnostic module (SDM) compares the restraint ID that is stored in the SDM to the restraints ID that is stored in the body control module (BCM). The restraints ID that is being compared to contains the last four digits of SDM pan number. The SDM receives these messages and compares them to information stored in memory, this DTC is set when the SDM receives a restraints ID over the class 2 communication circuit from the BCM that is different from the ID that is stored in the SDM memory.

CONDITIONS FOR RUNNING THE DTC
Ignition voltage is within the normal operating voltage range.

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.
- This test is only run once during power initialization.

ACTION TAKEN WHEN THE DTC SETS
- 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 BCM.

DIAGNOSTIC AIDS
This DTC is an indication that an incorrect SDM is installed in the vehicle, or that the SDM and/or the BCM was replace without reprogramming the BCM with the new information.

TEST DESCRIPTION

Steps 1-6:

Steps 7-8:

The following numbers refer to the step numbers in the diagnostic table:
2. This test checks for current inflatable restraint sensing and diagnostic module (SDM) DTCs.
3. This test checks to see if the correct vehicle information numbers (VIN) is programmed in the body control module (BCM).
4. This step explains that the BCM must be programmed.
6. This test checks to see if after clearing the DTCs if this DTC is current then its possible that the wrong SDM has been installed.