B1028

CIRCUIT DESCRIPTION
During the Initiator Assembly Resistance test, the inflatable restraint Diagnostic Energy Reserve Module (DERM) grounds the Driver Side Low terminal B8 and turns on the driver current source at the Driver Side High terminal B9. During this test, the DERM monitors the voltage at the Driver Side Low and the difference between the Driver Side High and the Driver Side Low. When the values measure outside the expected range, the DERM sets the DTC B1028.

CONDITIONS FOR SETTING THE DTC
The DTC sets when the voltage at the Driver Side Low measures below a specified value while its initiator resistance measures in a range above a specified value. This test runs once each ignition cycle during the Initiator Assembly Resistance test when:
- No higher priority faults are detected during the Turn On test.
- No higher priority faults are detected during the Continuous Monitoring tests for one second.
- No Crank signal is present.
- Ignition 1 voltage measures above a specified value.

ACTION TAKEN WHEN THE DTC SETS
The DERM turns on the AIR BAG warning lamp and sets a diagnostic trouble code.

CONDITIONS FOR CLEARING THE DTC
The DTC clears when the ignition switch is turned OFF.

DIAGNOSTIC AIDS
During the Initiator Assembly Resistance test, the DERM checks for the proper resistance of the following items:
- The CKT 347
- The CKT 348
- The inflatable restraint steering wheel module coil
- The inflatable restraint steering wheel inflator module
This test causes a known amount of current through a known amount of resistance causing a known amount of voltage at the Driver Side Low. When the measure resistance is in range and the voltage at the Driver Side Low measures too high or too low, the DERM sets the DTC.

TEST DESCRIPTION
When measurements are requested in this chart use J 39200 Digital Multimeter with correct terminal adapter from J 35616-A Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections in Diagrams. When a wire, connector or terminal repair is requested, use J 38125-A Terminal Repair Kit and refer to Wiring Repair.