Circuit Description
The ignition switch supplies battery voltage to the AIR BAG indicator using the ECU-B fuse. The AIR BAG indicator is connected to the AIR BAG indicator control circuit of the SDM. When the ignition switch is first turned to the ON position, the SDM responds by illuminating the AIR BAG indicator for approximately six seconds while performing diagnostic tests on the SIR system.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
| • | An open or high resistance in the AIR BAG indicator control circuit |
| • | An open AIR BAG indicator bulb |
| • | An internal SDM malfunction |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: SIR Schematics | |||||||||
1 | Did you perform A Diagnostic System Check - SIR? | Go to Step 2 | |||||||
2 | Do any of the other instrument cluster indicators or gages function? | Go to Step 3 | Go to Gages Inoperative - All in Instrument Panel, Gages and Console | ||||||
3 |
Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 4 | ||||||
Test the AIR BAG indicator control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 5 | |||||||
5 | Remove and inspect the AIR BAG indicator bulb for an open. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gages and Console. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 | ||||||
6 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 7 | -- | ||||||
7 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 | ||||||
