AIR BAG Warning Lamp Comes On Steady

Circuit Description
The ignition switch supplies Ignition 1 voltage to the Inflatable Restraint Sensing and Diagnostic Module (SDM) at terminal 10 using the AIR BAG 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 DTC's 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) wiring harness connector, the following two conditions must be met:
^ The SDM wiring harness connector must be properly connected to the SDM.
^ The Connector Position Assurance (CPA) must be properly installed in the SDM wiring harness connector.

When measurements are requested in this table, use the J 39200 DMM with the correct terminal adapter from the J 35616-A Connector Test Adapter kit. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This step checks to see if sufficient IGNITION voltage is applied to the SDM.
3. This step checks to see if excessive IGNITION voltage is applied to the SDM.
4. This step checks to see if the Connector Position Assurance (CPA) is properly installed.
6. This step determines if the SDM is turning on the AIR BAG warning lamp or if there is a malfunctioning SDM.
7. This step checks to see if the shorting bar is damaged.
9. This step checks to see if there is a short to ground in circuit 358.
10. This step determines if there is a short between circuit 358 and circuit 1751 or if there is a short to ground in circuit 358.
14. This step checks to see if Fuse 21 is OK. An open Fuse 21 would cause the AIR BAG warning lamp to come on steady.
15. This step checks to see if a short to ground caused Fuse 21 to open.
16. This step checks to see if there is a short to ground in circuit 1139.
19. This step checks to see if the SDM wiring harness connector properly secures to the SDM.
25. This step checks to see if there is an open in circuit 1139.
27. This step determines if there is an open or a high resistance in the B+ feed circuit to the input side of Fuse 21 or if there is a malfunctioning SDM.