Part 2 of 2

Test P: DTC 25 Initiator Circuit Short To Ignition (Part 2 Of 2):

Supplemental Inflatable Restraint (SIR):

OPERATION:
During the "Initiator Assembly Resistance Test" the DERM grounds the "Driver Side Low" terminal "B8" and measures the voltage at "Driver Side Low" and "Passenger Side Low." The DERM then grounds "Passenger Side Low" terminal "B7" and again measures the voltage at "Driver Side Low" and "Passenger Side Low." For a properly operating circuit the voltage measurements during each of these tests will be below a specified value. When the voltages measured at both "Driver Side Low" and "Passenger Side Low" are above a specified value during both tests DTC 25 is set.

Test Conditions: Tested 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 1 second, 3) No "CRANK" signal present, 4) "Ignition 1" voltage is above a specified value.

Failure Conditions: DTC 25 will set when the voltages measured at both "Driver Side Low" and "Passenger Side Low" are above a specified value while the DERM attempts to ground each of these terminals.

Action Taken: DERM turns "ON" the "INFLATABLE RESTRAINT" warning lamp and sets a Diagnostic Trouble Code.

Conditions to Clear: DTC 25 will clear when the voltage measured at either "Driver Side Low" or "Passenger Side Low" is below a specified value while the DERM grounds either of these terminals.

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
3. This test checks for a short from the high side of the Driver Deployment Loop to B+.
4. This test checks for a short from the high side of the Passenger Deployment Loop to B+.
5. This test determines whether the malfunction is due to a short from the low side of the Driver Deployment Loop to B+.
6. This test checks for a short from the low side of the passenger deployment loop 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, CKTs 347, 348, 1403 or 1404 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 10 minutes or until the next ignition cycle.