B0012

DTC B0012

CIRCUIT DESCRIPTION
The air bag sensing and diagnostic module (SDM) sends serial data along the tertiary serial data bus, circuit 774, to the body control module (BCM) and then on to the instrument cluster on the secondary serial data bus, circuit 1061. This is read by the instrument cluster, which displays the status of the SDM on the multifunction display (MFD) and cluster indicator. DTC 12 will set if there is no SDM data message on the bus for more than 10 seconds. The DTC is reset within 10 seconds of the arrival of a SDM data message on the bus. The DTC is logged as a History DTC.

DIAGNOSTIC AIDS
By manipulating the harnesses at the various connectors it is often possible to isolate the cause of the circuit interruption. This harness can then be removed and repaired. Inspect for any damage to the harness which could cause an intermittent open or short to ground or backed out terminals at the instrument cluster connectors, broken connector locks, improperly formed or damaged terminals. The multimeter allows continuity of the wiring harness circuit 774 to be checked. If the fault cannot be found in the harness then the fault may lie in the SDM or the BCM. Refer to Diagnostic Starting Point - Computer/Integrating Systems for further diagnosis. Testing and Inspection

TEST

Step 1 - Step 8:

DTC 12 - NO SERIAL DATA FROM SDM