Supplemental Inflatable Restraint (SIR)

Wiring Diagram:

CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the DERM grounds the "Driver Side Low" terminal "Be" through an internal resistor and measures the voltage at "Driver Side Low." For a properly operating circuit the voltage measurement during this test will be below a specified value. When the voltage measured at "Driver Side Low" is above a specified value DTC 25 is set.

DTC WILL SET WHEN
The voltage measured at "Driver Side Low" terminal "B8" is above a specified value while the DERM attempts to ground this terminal. This test is run during the "Initiator Assembly Resistance Test" and the "10 Minute Loop Test" when: 1) No "higher priority faults" are detected during "Turn-ON," 2) No "higher priority faults" are detected during "Continuous Monitoring" for one second, 3) No "Crank" signal present, 4) "Ignition 1" voltage is above a specified value.

ACTION TAKEN
DERM turns "ON the "AIR BAG" warning lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
The voltage measured at "Driver Side Low" terminal "B8" is below a specified value while the DERM grounds this terminal.

DTC TABLE TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test determines whether the malfunction is occurring in the steering column.
2. This test checks for a short from the "Driver Side High" circuit to B+.
3. This test checks for a short from the "Driver Side Low" circuit to B+.
4. This test checks for a short from the discriminating sensor interconnect circuit to B+.

DIAGNOSTIC AIDS
This diagnostic trouble code can only be set when the malfunction is present as the ignition switch is turned "ON." After the "Initiator Assembly Resistance Test" is completed a short to B+ in the steering column, CKT 347, CKT 348 or CKT 349 will cause DTC 24 to set. When a scan tool "Clear Codes" command is issued and the malfunction is still present, the DTC will not reappear for ten minutes or until the next ignition cycle.