R018

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 voltage measured at either "Driver Side Low" or "Passenger Side Low," but not both, is above a specified value during either test DTC RO18 is set.

DTC WILL SET WHEN
The voltage measured at either "Driver Side Low" or "Passenger Side Low," but not both, is above a specified value while the DERM attempts to ground either 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 voltages measured at both "Driver Side Low" and "Passenger Side Low" are below specified value while the DERM grounds each of the terminals.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks whether the interconnect malfunction is due to a malfunction in the RH discriminating sensor.
2. This test checks whether the malfunction is in CKT 1404B.
3. This test determines whether the malfunction is in CKT 348B.

DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor connection to the RH discriminating sensor terminals "A" or "D", or poor wire to terminal connection in CKT 348B or CKT 1404B. 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.