Restraint System Diagnosis

DTC B1001

CIRCUIT DESCRIPTION
When the ignition is turned ON, 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 body control module (BCM). The restraints ID that is being compared contains the last 4 digits of the SDM part number. The SDM receives this message and compares it to the 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.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTC:
DTC B1001 SDM Option Configuration Error

CONDITIONS FOR RUNNING THE DTC
Ignition 1 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 - 8:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the correct VIN is programmed in the BCM.
4. This step verifies that the BCM has been replaced.