Circuit Description
When the ignition switch is turned on and during vehicle operation, the SDM
performs tests to detect system faults. One test the SDM performs is to monitor the
passenger inflator module high circuit and the passenger inflator module low circuit
voltage difference. By monitoring the voltage difference, the SDM is able to calculate
the passenger loop resistance. High resistance indicates an open somewhere in the
passenger deployment loop.
Conditions for Setting the DTC
DTC B0017 can be set when the passenger loop resistance is high. The following
conditions must be met to set this DTC:
| • | Ignition voltage is present at the SDM and continuous. |
| • | The passenger deployment loop resistance is over 4.8 ohms or circuit 1403
under 2.4 volts with deployment loop resistance over 6 ohms. |
| • | The fault is present for half a second. |
Action Taken When the DTC Sets
| • | The air bag telltale will be on. |
Diagnostic Aids
| • | When attempting to diagnose an intermittent passenger loop fault, use
the scan tool to monitor the current DTCs. Wiggle the wires and check the connections
while watching for a current DTC to appear and/or disappear on the scan tool. |
| • | Always start diagnosis of the SIR DTCs with an inspection of the wiring
and the components for visible damage. |
| • | An open in the circuits 1403 or 1404 to the passenger inflator
module could cause this DTC. |
B0017
