GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Restraints 🢒 SIR 🢒 DTC B0109, B0110, or B0111

Circuit Description

The driver rear side deployment loop consists the following components:

    • An inflatable restraint side impact module - LR
    • The side impact module - LR high circuits
    • The side impact module - LR Low circuits

A shorting bar used within the side impact module - LR connector which will short together both side impact module - LR high circuit, and the side impact module - LR low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the side impact module during servicing. During a side crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the side impact module - LR. 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 diagnostic trouble code (DTC) will be stored in memory.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B0109 Left Rear Side Deployment Loop Resistance Low
    • DTC B0110 Left Rear Side Deployment Loop Open
    • DTC B0111 Left Rear 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 B0109 will set when the side impact module - LR deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
    • DTC B0110 will set when one of the following conditions occurs:
       - Side impact module - LR high circuit is less than 2.4 volts and the side impact module - LR deployment loop is more than 6 ohms for 500 milliseconds.
       - Side impact module - LR deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
    • DTC B0111 will set when one of the following conditions occur:
       - Side impact module - LR high and/or low circuits is short to ground or short to voltage for 500 milliseconds.
       - Side impact module - LR high circuit is less than 2.4 volts and side impact module - LR 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 - LR high and low circuits
    • An open or a high resistance in the side impact module - LR high or low circuits
    • A short to ground or a short to voltage in the side impact module - LR high or low circuits
    • The side impact module - LR connector
    • The SDM connector
    • A malfunctioning side impact module - LR
    • 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 in Wiring Systems.

Test Description

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

  1. Tests to see if the malfunction is caused by the side impact module - LR.

    2.

  2. Tests to see what DTCs are present. If DTC B0109 is present, test the side impact module - LR for a short between high and low circuits. If DTC B0110 is present, test the side impact module - LR high and low circuits for an open and for high resistance. If DTC B0111 is present, test the side impact module - LR high and low circuits for a short to ground and for 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 in Vehicle DTC Information

2
  1. Turn OFF the ignition.
  2. Disconnect side impact module - LR in-line connector. Refer to Rear Seat Body Side Inflatable Restraint Module Replacement .
  3. Inspect the component and harness sides of the in-line connector for the side impact module - LR for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Does connector exhibits any signs of damage or corrosion?

Go to Step 3

Go to Step 4

3
  1. If the in-line connector for the side impact module - LR is damaged, the side impact module must be replaced. Refer to Rear Seat Body Side Inflatable Restraint Module Replacement .
  2. If the wiring harness side of the side impact module - LR connector is damaged, replace the harness side of the connector. Refer to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

--

4

  1. Install the J 38715-A SIR Driver/Passenger Load Tool to the harness side of the side impact module - LR connector. Use PASSENGER INFLATOR connector.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, request the SIR DTC display.

Does the scan tool indicate that DTC B0109, B0110, or B0111 are current?

Go to Step 5

Go to Step 7

5
  1. Turn OFF the ignition.
  2. Disconnect and remove the J 38715-A .
  3. Disconnect the inflatable restraint sensing and diagnostic module (SDM) connector. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
  4. Inspect the SDM connector for damage or corrosion that may cause a malfunction in the side impact module - LR high and/or low circuits. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

  1. If DTC B0109 is present, test the side impact module - LR for a short between the high and low circuits.
  2. If DTC B0110 is present, test the side impact module - LR high and low circuits for an open and for high resistance.
  3. If DTC B0111 is present, test the side impact module - LR 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 in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7
  1. Turn OFF the ignition.
  2. Replace the side impact module - LR. Refer to Rear Seat Body Side Inflatable Restraint Module Replacement .

Did you complete the replacement?

Go to Step 9

--

8
  1. Turn OFF the ignition.
  2. Replace the SDM. Refer to Control Module References in Computer/Integrating Systems 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