R025

CIRCUIT DESCRIPTION
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 RO25 is set.

DTC 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. 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 either "Driver Side Low" or "Passenger Side Low" is below a specified value while the DERM grounds either of these terminals.

DTC CHART 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 circuitry.
2. This test determines whether the malfunction is occurring in the passenger inflator module circuitry.
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 checks for 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, CKT 347, CKT 348, CKT 1403 or CKT 1404 will cause DTC RO24 to set. When a scan tool "Clear Codes" command is issued and the malfunction is still present, DTC RO25 will not reappear for ten minutes or until the next ignition cycle.