AIR BAG Warning Lamp Does Not Come On

Circuit Description

When the ignition switch is first turned to ON, the IPC/BFC Fuse applies battery voltage to the AIR BAG warning indicator that is connected to INFLATABLE RESTRAINT Indicator, terminal 7. The AIR BAG Fuse applies battery voltage to the IGNITION 1 input, terminal 10. The Inflatable Restraint Sensing and Diagnostic Module (SDM) responds by flashing the AIR BAG warning indicator 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.

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 teed circuitry.

3. This test determines whether voltage is present in the warning lamp circuit.

4. This test isolates circuit 358 and checks for a short in circuit 358 to voltage.

6. This test determines if the malfunction is in the instrument cluster connector.

8. This test determines if the open is due to a bad LED.

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 IPC/BFC Fuse.