Circuit Description
When the ignition switch is turned on and on and during the 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. A low loop resistance indicates two passenger circuits
are shorted together.
Conditions for Setting the DTC
DTC B0016 can be set when the passenger loop resistance is low. 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 under 1.3 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 components for visible damage. |
| • | A malfunctioning shorting bar at the passenger inflator module harness
could cause this DTC. |
B0016
