For 1990-2009 cars

### Circuit Description

DTC 56 is an indication of a potential internal inflatable restraint Sensing and Diagnostic Module (SDM) malfunction and requires SDM replacement.

### Conditions for Setting the DTC

• | There has been a frontal air bag and pretensioners deployment commanded.

• | There have been three pretensioner-only deployments commanded by this SDM.

• | There have been three driver side air bag deployments commanded by this SDM.

• | There have been three passenger side air bag deployments commanded by this SDM.

### Action Taken When the DTC Sets

• | The SDM sets a diagnostic trouble code.

• | The SDM turns ON the AIR BAG warning lamp.

### Conditions for Clearing the DTC

The SDM is replaced.

### Test Description

The numbers below refer to the step numbers on the diagnostic table:

1. This DTC requires the replacement of the SDM.

#### DTC 56 SDM Not Reusable

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the SIR Diagnostic System Check performed? | -- | Go to Step 2 | Go to SIR Diagnostic System Check
2 |

1. Turn the ignition switch to the OFF position.
2. Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement .

Is the replacement complete?

--

Go to SIR Diagnostic System Check

--