B0041 Airbag Code

[cope6k]

Hey All...Went to my local shop after getting the dreaded Service Airbag in the DTC. He pulled code B0041 (drivers side loop). Unfortunately he doesn't do airbag work and I thought I'd see if anybody here had the same thing before and where the likely problems may be. I'd like to check a few things myself before I take it to the dealer.

 

Thanks.

Jim

2004 Suburban LT 4wd

100K miles

[gmtech4]

sorry but its not that simple ,heres the diag tree

 

Circuit Description

 

The inflatable restraint side impact module deployment loop consists of a side impact module, side impact module high control, and side impact module low control circuits. A shorting bar is used on the side impact module connector which will short together the side impact module high and side impact module low control circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (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.

Conditions for Running the DTC

 

Ignition?1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

 

 

• DTC?B0040 will set when the SDM detects the LF side impact module deployment loop resistance is less than 1.3?? for 500?milliseconds.

 

 

 

• DTC?B0041 will set when one of the following conditions occurs:

 

 

 

 

- The SDM detects the LF side impact module deployment loop resistance is greater than 4.8?? for 500?milliseconds.

 

 

 

 

- The SDM detects the voltage at LF side impact module high control is less than 2.4?volts and LF side impact module deployment loop resistance is 6?? or greater for 500?milliseconds.

 

 

 

• DTC B0045 will set when one of the following conditions occur:

 

 

 

 

- The SDM detects the voltage at LF side impact module high control is greater than 6?volts for 500?milliseconds.

 

 

 

 

- The SDM detects the voltage at LF side impact module high control is less than 2.4?volts and LF side impact module deployment loop resistance is less than 6?? 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.

 

 

 

• You issue a scan tool CLEAR DTCs command.

 

 

 

• A history DTC will clear once 255 malfunction free ignition cycles have occurred.

 

Diagnostic Aids

 

The following can cause an intermittent condition:

 

• A short between the LF side impact module high and LF side impact module low control circuits

 

 

 

• An open or high resistance in the LF side impact module high or LF side impact module low control circuits

 

 

 

• A malfunctioning shorting bar on the LF side impact module connector

 

 

Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

 

The numbers below refer to the step numbers on the diagnostic table.

2 Inspects the LF side impact module in-line connector.

 

4 Tests for a malfunctioning LF side impact module.

 

7 If DTC B0040 is present, test for a short between the LF side impact module high and LF side impact low control circuits. If DTC B0041 is present, test for an open or high resistance in the LF side impact module high and LF side impact module low control circuits. If DTC B0045 is present, test for a short to ground or voltage in the LF side impact module high and LF side impact module low control circuits.

 

 

Step

 

 

 

Action

 

 

 

Yes

 

 

 

No

 

 

 

Schematic Reference: SIR Schematics

 

Connector End View Reference: SIR Connector End Views

 

 

1

 

 

Did you perform the Diagnostic System Check - SIR?

 

 

Go to Step?2

 

 

Go to Diagnostic System Check - SIR

 

 

2

 

 

 

 

1. Turn OFF the ignition.

 

 

 

2. Disconnect the LF side impact module in-line connector located under the seat. Refer to Driver or Passenger Seat Side Inflatable Restraint Module Replacement .

 

 

3. Inspect both halves of the connector for the following conditions:

 

 

• Corrosion

 

 

• Terminal damage

 

 

• Poor connections/terminal tension

 

Do the connectors exhibit any signs of corrosion, terminal damage, or poor connections?

 

 

Go to Step?3

 

 

Go to Step?4

 

 

3

 

 

 

 

1. If the LF side impact module harness connector exhibits any of the above conditions, replace the LF side impact module wiring harness. Refer to

Driver or Passenger Seat Side Inflatable Restraint Module Replacement .

 

 

2. Replace the harness side of the LF side impact module in-line connector. Refer to

Connector Repairs in Wiring Systems.

 

Did you complete the replacement?

 

 

Go to Step?11

 

 

—

 

 

4

 

 

 

 

1. Install the J 38715-A SIR Load Tool to the harness side of the LF side impact module in-line connector located under the seat.

 

 

2. Turn ON the ignition, with the engine OFF.

 

 

3. With a scan tool, request the SIR DTC display.

 

Does the scan tool indicate that either DTC B0040, B0041, or B0045 is current?

 

 

Go to Step?6

 

 

Go to Step?5

 

 

5

 

 

 

 

1. Turn OFF the ignition.

 

 

2. Disconnect the

J 38715-A .

 

 

3. Reconnect the LF side impact module in-line connector.

 

 

4. Remove the LF side impact module connector located at the module. Refer to

Driver or Passenger Seat Side Inflatable Restraint Module Replacement .

 

 

5. Use the J?38715–30A adapter to connect the

J 38715-A to the LF side impact module connector.

 

 

6. Turn ON the ignition, with the engine OFF.

 

 

7. With a scan tool, request the SIR DTC display.

 

Does the scan tool indicate that either DTC B0040, B0041, or B0045 is current?

 

 

Go to Step?10

 

 

Go to Step?9

 

 

6

 

 

 

 

1. Turn OFF the ignition.

 

 

2. Remove the

J 38715-A .

 

 

3. Disconnect the SDM connector. Refer to

Inflatable Restraint Sensing and Diagnostic Module Replacement .

 

 

4. Inspect the SDM connector for corrosion or damage. 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?11

 

 

Go to Step?7

 

 

<a href="http://gsi.xw.gm.com/newsi/showDoc.do?docSyskey=797634&cellId=68692&pubObjSyskey=3143072&from=sm&pubCellSyskey=499936&deliveryEffectiveDate=Mar+1%2C+2012#td07">7

 

 

 

 

1. If DTC B0040 is present, test the LF side impact module high and LF side impact module low control circuits for a short. Refer to

Circuit Testing and Wiring Repairs in Wiring Systems.

 

 

 

2. If DTC B0041 is present, test the LF side impact module high and LF side impact module low control circuits for an open or high resistance. Refer to

Circuit Testing and Wiring Repairs in Wiring Systems.

 

 

 

3. If DTC B0045 is present, test the LF side impact module high and LF side impact module low control circuits for a short to ground or voltage. Refer to

Circuit Testing and Wiring Repairs in Wiring Systems.

 

 

Did you find and correct the condition?

 

 

Go to Step?11

 

 

Go to Step?8

 

 

8

 

 

Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

 

Did you complete the replacement?

 

 

Go to Step?11

 

 

—

 

 

9

 

 

Replace the LF side impact module. Refer to Driver or Passenger Seat Side Inflatable Restraint Module Replacement .

 

Did you complete the replacement?

 

 

Go to Step?11

 

 

—

 

 

10

 

 

Replace the LF side impact module wiring harness. Refer to Driver or Passenger Seat Side Inflatable Restraint Module Replacement .

 

Did you complete the replacement?

 

 

Go to Step?11

 

 

—

 

 

11

 

 

 

 

1. Reconnect all SIR system components.

 

 

 

2. Verify that all components, connectors and CPAs are properly mounted.

 

 

 

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

[cope6k]

Thanks for the response but for me to do that I'm sure I'd need a Tech 2. I was hoping there were folks who knew of a TSB or something so that maybe there were just some loose connections to check for.

 

Guess I'm off to the dealer.

[gmtech4]

oh ,sry,no bulletins either