GM Service Manual Online
For 1990-2009 cars only

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 deployment loops.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1383 RF Side Deployment Loop Resistance Low

Conditions for Running the DTC

Ignition voltage is within the normal operating voltage range.

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.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Step

Action

Values

Yes

No

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

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

Schematic Reference: SIR Schematics

Connector End View Reference: Component Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Confirm the ignition switch is OFF.
  2. Disconnect the connector of the passenger side impact module.
  3. Remove the connector of the sensing and diagnostic module (SDM).
  4. Measure the resistance between terminal 39 and 40 of the SDM connector.

Is the resistance equal to the specified value?

Go to Step 3

Go to Step 5

3

  1. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Confirm the ignition switch is ON.
  3. Use the scan tool to clear the DTCs.
  4. Perform the Diagnostic System Check - Vehicle .

Is the DTC removed?

--

Go to Step 6

Go to Step 4

4

Replace the passenger side impact module.

Is the replacement complete?

--

Go to Step 6

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5

Replace the air bag wiring.

Is the replacement complete?

--

Go to Step 6

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6

  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