Air Bag Warning Lamp Does Not Come On

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.

When measurements are requested in this table, use the J 39200 Digital Multimeter with the correct terminal adapter from the J 35616-A Connector Test Adapter Kit. When an inspection for proper connection is requested, refer to Intermittents and Poor Connections. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit. Refer to Wiring Repair. Intermittent Problems SIR Wiring Repair

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test determines whether the malfunction is in the inflatable restraint Sensing and Diagnostic Module (SDM) circuitry or in the instrument cluster power feed circuitry.
3. This test determines whether voltage is present in the warning lamp circuit.
4. This test isolates CKT 358 and checks for a short in CKT 358 to B+.
6. This test determines if the malfunction is in the instrument cluster connector.
8. This test isolates an open in the warning lamp circuitry.
11. This test checks whether power is available to the instrument cluster power feed circuit.
12. This test checks for a short from the instrument cluster power feed circuit to ground.
13. This test determines whether the short to ground is due to a short in the wiring or internal to the instrument cluster.
17. This test determines if the malfunction is in the instrument cluster connector.
19. This test determines whether the malfunction is due to an open power feed circuit from the CLUSTER Fuse.