DTC 28

CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the DERM grounds the "Passenger Side Low" terminal "B7" and turns "ON" the driver current source at the "Driver Side High" terminal "B9". The DERM then grounds the "Driver Side Low" terminal "B8" and turns "ON" the passenger current source at the "Passenger Side High" terminal "A7". During each of these tests the DERM monitors voltage at "Driver Side Low," "Passenger Side Low," the difference between "Driver Side High" and "Driver Side Low" and the difference between "Passenger Side High" and "Passenger Side Low." When the measured values are outside the expected range DTC 28 is set.

DTC WILL SET WHEN
The voltage measured at "Driver Side Low" or "Passenger Side Low" is below a specified value while its respective initiator resistance is in range or when the voltage measured at "Driver Side Low" or "Passenger Side Low" is above a specified value. This test is run once each ignition cycle during the "Initiator Assembly Resistance 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 ignition switch is turned "OFF."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks whether the malfunction is in the forward discriminating sensor.
2. This test determines whether the malfunction is in CKT 1404B.
3. This test determines whether the malfunction is in the RH mid-rail discriminating sensor.
4. This test checks for a high resistance in CKT 348E.
5. This test checks for an open in the LH mid-rail discriminating sensor terminal "A" and the splice.
6. This test checks for a high resistance between the RH mid-rail discriminating sensor and the LH mid-rail discriminating sensor.
7. This test checks for a high resistance between the driver inflator module and the LH mid-rail discriminating sensor.

DIAGNOSTIC AIDS
A CKT 1404B malfunction would be a high resistance rather than an open.

A CKT 348B, 348C or 348E malfunction would be a high resistance rather than an open.