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 the voltage, the SDM is able to detect when the loop voltage
is not between 2.4 and 6.0 volts.
Conditions for Setting the DTC
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 the loop resistance under 6 ohms. |
| • | The fault is present for half a second. |
Action Taken When the DTC Sets
| • | The DTC B0024 will set. |
| • | 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 drive loop fault, use the
scan tool to monitor the current DTCs. Wiggle the wires, turn the steering wheel,
and check the connections while watching for a current DTC to appear and/or disappear
on the scan tool. |
| • | Always start the diagnosis of the SIR DTCs with an inspection of the wiring
and the components for visible damage. |
| • | A short to ground in circuits 347 or 348 and another vehicle circuit
could cause this DTC. |
B0024
