GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2007 🢒 Montana SV6 Ext. 🢒 Brakes 🢒 Park Brake 🢒 DTC B0028, B0029, or B0030

Circuit Description

The passenger side deployment loop consists of the following components:

    • An inflatable restraint side impact module RF
    • The side impact module RF high circuits
    • The side impact module RF low circuits

A shorting bar is used within the side impact module RF connector. The shorting bar will short together the side impact module RF high circuit, and the side impact module RF low circuit when the connector is disconnected. This helps prevent unwanted deployment of the inflator module during servicing. During a side or frontal crash of sufficient force, the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop. This flow of current will deploy the side impact module RF. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B0028 Right Front Side Deployment Loop Resistance Low
    • DTC B0029 Right Front Side Deployment Loop Open
    • DTC B0030 Right Front Side Deployment Loop Voltage Out of Range

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC
    • DTC B0028 will set when the side impact module RF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
    • DTC B0029 will set when one of the following conditions occurs:
       - The side impact module RF high circuit is less than 2.4 volts and the side impact module RF deployment loop is more than 6 ohms for 500 milliseconds.
       - The side impact module RF deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
    • DTC B0030 will set when one of the following conditions occur:
       - The side impact module RF high and/or low circuits are short to ground or short to voltage for 500 milliseconds.
       - The side impact module RF high circuit is less than 2.4 volts and the side impact module RF deployment loop resistance is less than 6 ohms for 500 milliseconds.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON via class 2 serial data.

Conditions for Clearing the DTC
    • The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
    • A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Diagnostic Aids

The following are possible causes of the malfunction:

    • A short between the side impact module RF high and low circuits
    • An open or a high resistance in the side impact module RF high or low circuits
    • A short to ground or a short to voltage in the side impact module RF high or low circuits
    • The side impact module RF connector
    • The SDM connector
    • A malfunctioning side impact module RF
    • A malfunctioning SDM

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step tests to see what DTCs are present. If DTC B0028 is present, test the side impact module RF for a short between high and low circuits. If DTC B0029 is present, test the side impact module RF high and low circuits for an open and for high resistance. If DTC B0030 is present, test the side impact module RF high and low circuits for a short to ground or a short to voltage.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn OFF the ignition.
  2. Disconnect the side impact module RF connector. Refer to Driver and Passenger Seat Side Inflatable Restraint Module Replacement .
  3. Inspect the component and harness sides of the side impact module RF connector for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Does connector exhibits any signs of damage or corrosion?

Go to Step 3

Go to Step 4

3
  1. If the component side of the side impact module RF connector is damaged, the side impact module RF must be replaced. Refer to Driver and Passenger Seat Side Inflatable Restraint Module Replacement .
  2. If the harness side of the side impact module RF connector is damaged, replace the harness side of the connector. Refer to Connector Repairs .

Did you complete the repair?

Go to Step 9

--

4

    Important: If the scan tool displays multiple codes, diagnose the open code first.

  1. Connect the J 38715-A SIR Driver/Passenger Load Tool or SA9409Z-A to the harness side of the side impact module RF wiring harness connector. Use the PASSENGER INFLATOR connector.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool to request SIR DTCs displayed.

Does the scan tool indicate that DTC B0028, B0029, or B0030 are current?

Go to Step 6

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Disconnect and remove the J 38715-A .
  3. Replace the side impact module RF. Refer to Driver and Passenger Seat Side Inflatable Restraint Module Replacement .

Did you complete the replacement?

Go to Step 9

--

6
  1. Turn OFF the ignition.
  2. Disconnect and remove the J 38715-A or SA9409Z-A.
  3. Disconnect the inflatable restraint sensing and diagnostic module (SDM) connector. Refer to Control Module References for replacement, setup, and programming.
  4. Inspect the SDM connector for damage or corrosion that may cause a malfunction in the side impact module RF high and/or low circuits. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 7

7

  1. If DTC B0028 is present, test the side impact module RF circuits for a short between the high and low circuits.
  2. If DTC B0029 is present, test the side impact module RF high and low circuits for an open and for high resistance.
  3. If DTC B0030 is present, test the side impact module RF high and low circuits for a short to ground and for a short to voltage.
  4. All the above conditions refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 8

8
  1. Turn OFF the ignition.
  2. Replace the SDM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

--

9
  1. Connect all SIR components.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool in order to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK