B1126

When measurements are requested in this table, use J 39200 DVM with the 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 Diagram Information in Diagrams. When a wire, connector, or terminal repair is requested, use J 38125-A Terminal Repair Kit and refer to Wiring Repair.

CIRCUIT DESCRIPTION
When you first turn the ignition switch to the RUN position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. Next the SDM measures IGNITION 1 voltage to make sure it is within its respective normal voltage range. Then the SDM proceeds with the DEPLOYMENT LOOP CONTINUITY test. During the DEPLOYMENT LOOP CONTINUITY test, the SDM measures the voltage difference between Driver Frontal High and Driver Frontal Low.

CONDITIONS FOR SETTING THE DTC
^ The voltage difference between Driver Frontal High terminal 10 and Driver Frontal Low terminal 9 is more than or equal to 426 millivolts.
^ The malfunction must be present for at least 500 milliseconds during one of the following tests:
- DEPLOYMENT LOOP CONTINUITY- If malfunction is detected in this test, the RESISTANCE MEASUREMENT test will not be performed.
- CONTINUOUS MONITORING.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM sets a diagnostic trouble code.
^ The SDM commands the Instrument Panel Cluster (IPC) to turn ON the AIR BAG warning lamp.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC.
The voltage difference between Driver Frontal High terminal 2 and Driver Frontal Low terminal 3 is less than 426 millivolts for 500 milliseconds.
^ History DTC.
- You issue a scan tool CLEAR CODES command.
- 250 malfunction-free ignition cycles have occurred.

DIAGNOSTIC AIDS
The following can cause an intermittent condition:
^ A poor connection at the inflatable restraint steering wheel module steering column connector terminals A and B.
^ A poor connection at the upper inflatable restraint steering wheel module coil connector terminals A and B.
^ A poor connection at the SDM terminals 10 and 9.
^ An open in CKT 347.
^ An open in CKT 348.

An intermittent open in the inflatable restraint steering wheel module coil could also set this DTC. To test for a bad inflatable restraint steering wheel module coil, clear DTCs, then turn the steering wheel back and forth with the ignition switch in the RUN position. If the AIR BAG warning lamp comes ON and DTC B1126 has set again, it is likely the inflatable restraint steering wheel module coil is malfunctioning.

DTC TABLE TEST DESCRIPTION
Number below refer to step number on the diagnostic table.
2. This test determines the deployment loop voltage difference measured by the inflatable restraint Sensing and Diagnostic Module (SDM).
3. This test checks for proper contact and/or corrosion of the yellow 2-way connector.
10. This test isolates the malfunction to one side of the inflatable restraint steering wheel module yellow 2-way connector located near the base of the steering column.
11. This test determines whether the malfunction is in the inflatable restraint steering wheel module coil or the inflatable restraint steering wheel module.
14. This test checks for proper contact and/or corrosion of the SDM connector.
16. This test checks for proper contact and/or corrosion of the SDM connector.
19. This test determines whether the malfunction is in CKT 347.
21. This test determines whether the malfunction is in CKT 348.