GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 DTC 🢒 DTC B1383

Circuit Description

When the ignition switch is turned to ON, the sensing and diagnostic module(SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself.

Upon passing these test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.

The SDM checks the wiring connection to the passenger side airbag module by letting the infinitesimal current flow through the internal circuit and verify the resistance.

Conditions for Setting the DTC
    • The resistance of the driver side air bag deployment loop is lower than 1.4 ohms.
    • The shorting bar is damaged and the SDM must be replaced.

Step

Action

Values

Yes

No

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

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

 

1
  1. Confirm the ignition switch is OFF.
  2. Disconnect the connector of the passenger side air bag module.
  3. Remove the connector of the sensing and diagnostic module (SDM).
  4. Measure the resistance between terminal 1 and 2 of the passenger side air bag module.

Is the resistance equal to the specified value?

∞

Go to Step 2

Go to Step 4

2
  1. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Confirm the ignition switch is ON.
  3. Remove the DTC with the scan tool.
  4. Perform the Diagnostic System Check - SIR.

Is the DTC removed?

--

System OK

Go to Step 3

3

Replace the passenger side air bag module.

Is the replacement complete?

--

Go to Step 5

--

4

Replace the air bag wiring.

Is the replacement complete?

--

Go to Step 5

--

5
  1. Reconnect all SIR system components.
  2. Verify that all components, connectors, and connector position assurances (CPAs) are properly mounted.
  3. Use the scan tool to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the text.

Does the DTC reset?

--

Go to Step 2

System OK