Circuit Description
The ignition switch supplies ignition 1 voltage to the inflatable restraint sensing and diagnostic module (SDM) using the F1 fuse. The ignition switch also supplies battery voltage to the AIR BAG indicator using the F4 fuse. The AIR BAG indicator is connected to the AIR BAG indicator output of the SDM. When the ignition switch is first turned to the ON position, the SDM responds by flashing the AIR BAG indicator seven times.
Diagnostic Aids
In order to disable the shorting bar between the air bag indicator control circuit and ground inside the 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. |
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 the Diagnostic System Check - SIR? | Go to Step 2 | |
Did you find and correct the condition? | Go to Step 5 | Go to Step 3 | |
3 | Test the air bag indicator control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 5 | Go to Step 4 |
4 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 5 | -- |
5 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
