Air Bag Warning Lamp Comes On Steady

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The ignition switch supplies Ignition 1 voltage to the inflatable restraint Sensing and Diagnostic Module (SDM) at terminal 10 using the SIR Fuse. The ignition switch also supplies Ignition 1 voltage to the AIR BAG warning lamp using the CLUSTER Fuse. The AIR BAG warning lamp is connected to the INFLATABLE RESTRAINT INDICATOR at terminal 7 of the SDM. When the ignition switch is first turned to the RUN position, the SDM responds by flashing the AIR BAG warning lamp seven times. If IGNITION 1 is outside of the normal operating voltage range (8.2 volts-17.1 volts), the AIR BAG warning lamp will come ON solid with no DTCs set.

Diagnostic Aids
In order to disable the shorting bar from terminal 6 to terminal 7 inside the inflatable restraint Sensing and Diagnostic Module (SDM) harness connector, the following two conditions must be met:

^ The SDM harness connector must be properly connected to the SDM.
^ The Connector Position Assurance (CPA) must be properly installed in the SDM harness connector.

When measurements are requested in this table, use J 39200 Digital Multimeter 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. When a wire, connector or terminal repair is requested, use J 38125-A Terminal Repair Kit and refer to Wiring Repair. Intermittent Problems Service and Repair

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test checks for sufficient IGNITION voltage applied to the SDM.
3. This test checks for excessive IGNITION voltage applied to the SDM.
4. This test checks for a properly installed CPA.
6. This test determines if the SDM is turning on the AIR BAG warning lamp.
7. This test checks for a damaged shorting bar.
9. This test determines whether the malfunction is a short to ground in CKT 358.
10. This test checks for a short between CKT 358 and CKT 1751.
14. An open SIR Fuse would cause the AIR BAG warning lamp to come on steady.
15. This test checks whether a short to ground caused the SIR Fuse to open.
16. This test determines whether the short to ground is due to a short in the wiring or internal to the SDM.
20. This test checks for a disconnected SDM.
26. This test checks for an open in the IGNITION circuit.