For 1990-2009 cars

### Circuit Description

The ignition switch supplies ignition 1 voltage to the inflatable restraint sensing and diagnostic module (SDM) using the F10 fuse. The ignition switch also supplies battery voltage to the AIR BAG indicator using the F1 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 six 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.

1. This step determines if the malfunction is caused by a battery overcharge condition.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views
1 | Did you perform a Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Turn OFF the ignition.
2. Disconnect the sensing and diagnostic module (SDM) connector.
3. Inspect the SDM connector and the shorting bar for damage or corrosion.

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 . 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