Circuit Description
When the ignition switch is turned ON and during vehicle operation, the SDM
performs tests to detect faults. While the SDM is performing tests to detect system
faults, tests are also performed on internal components of the SDM. When an internal
SDM fault is detected this DTC is set.
DTC Parameters
DTC B1000 can be set when the SDM malfunctions. The following conditions
must be met to set this DTC:
| • | Ignition voltage is present at the SDM and continuous. |
| • | The SDM has detected an internal fault or an air bag deployment has been
commanded. |
| • | Fault is present for half a second. |
Action Taken
| • | The air bag telltale will be ON. |
Diagnostic Aids
| • | Always start diagnosis of SIR DTCs with an inspection of vehicle, including
its wiring and SIR components for visible damage. |
| • | Always replace SDMs with a DTC B1000 set, only after all collision
repairs have been completed. |
