GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Vivant 🢒 DTC 🢒 DTC 051

Circuit Description

The sensing and diagnostic module (SDM) contains a sensing device which converts vehicle velocity changes to an electrical signal. The electrical signal generated is processed by the SDM and then compared to a value stored in memory. When the generated signal exceeds the stored value, additional signal processing is performed and the generated signals are compared to signals stored in memory. When two of the generated signals exceed the stored values, the SDM will cause sufficient current to flow through the inflator modules to deploy the airbags and cause DTC 51 to be set.

Conditions for Setting the DTC

DTC 51 will set when the SDM detects a frontal crash within 30 degrees of the centerline of the vehicle, of sufficient force to warrant deployment of the airbags.

Action Taken When the DTC Sets

The SDM turns on the AIRBAG indicator, records crash data, and sets a DTC 51.

Conditions for Clearing the DTC

DTC 51 will clear when the SDM is replaced. This code cannot be cleared with a scan tool.

Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section.

Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.

Step

Action

Yes

No

1

Perform the Diagnostic System Check - SIR.

Is the Diagnostic System Check - SIR complete?

Go to Step 2

Go to Diagnostic System Check - SIR

2
  1. Turn OFF the ignition and remove the key.
  2. Check for deployed airbags.

Have the airbags deployed?

Go to Step 3

Go to Step 4

3
  1. Remove the airbag fuse.
  2. Turn the steering wheel to the straight-ahead position.
  3. Perform inspections and replace components as directed in Repairs and Inspections Required After a Collision .
  4. Replace the SDM. The arrow must be pointing toward the front of the vehicle. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  5. Connect all SIR components, and ensure that all components are properly mounted.
  6. Reinstall the airbag fuse.
  7. Use a scan tool to clear SIR trouble codes.

Did you complete the repair?

Diagnostic System Check - SIR

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4

Inspect the front of the vehicle and undercarriage for signs of impact.

Are there any signs of impact?

Go to Step 3

Go to Step 5

5
  1. Turn OFF the ignition and remove the key.
  2. Disconnect the passenger airbag, the yellow clock spring connector on the steering column, and connector C221.
  3. Replace the SDM. The arrow must be pointing toward the front of the vehicle.
  4. Connect all SIR components, and ensure that all components are properly mounted.

Did you complete the repair?

Go to Diagnostic System Check - SIR

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