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 driver deployment loop high circuit and driver deployment loop low circuit
voltage difference. By monitoring voltage, the SDM is able to detect when loop
voltage is not between 2.4 and 6.0 volts.
DTC Parameters
DTC B0024 can be set when the driver loop voltage is out of range. The
following conditions must be met to set this DTC:
| • | Ignition voltage is present at the SDM and continuous. |
| • | The driver loop voltage is over 6 volts OR under 2.4 volts
with loop resistance under 6 ohms. |
| • | Fault is present for half a second. |
Action Taken
| • | The air bag telltale will be ON. |
Diagnostic Aids
| • | Use this chart only when DTC B0024 is current on the scan tool. |
| • | When attempting to diagnose an intermittent driver loop fault, use the
scan tool to monitor current DTCs. Wiggle wires, turn steering wheel, and check
connections while watching for a current DTC to appear and/or disappear on the
scan tool. |
| • | Always start diagnosis of SIR DTCs with an inspection of wiring and components
for visible damage. |
| • | A short to ground in circuits 347 or 348 could cause this DTC. |
| • | A short between circuits 347 or 348 and another vehicle circuit could
cause this DTC. |
