GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Restraints 🢒 SIR 🢒 DTC B1001

Circuit Description

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) compares the restraints ID stored in the SDM to the restraints ID stored in the instrument panel cluster (IPC). The restraints ID being compared contains the last four digits of the SDM part number. For more detailed information concerning the Class 2 data lines, refer to Data Link Communications Description and Operation in Data Link Communications.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Action Taken When the DTC Sets
    • The SDM disables all AIR BAG deployments.
    • 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

DTC B1001 is an indication that the restraints ID stored in both the IPC and SDM do not match. If either the IPC or PCM were replaced, the replacement modules needs to be reprogrammed for proper operation.

Test Description

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

  1. This step checks to see if the correct VIN is programmed in the PCM.

    2.

  2. This step explains the proper steps to perform after a PCM has been replaced in order for the PCM to operate properly.

    3.

  3. This step explains the proper step to perform after a IPC has been replaced in order for the IPC to operate properly.

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. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, verify that the PCM is programmed with the correct VIN by comparing the VIN that is stored in the PCM to the VIN plate of the vehicle.

Is the PCM programmed with the correct VIN?

Go to Step 4

Go to Step 3

3

With a scan tool and/or techline machine, program the correct VIN into the PCM. Refer to PCM programming in Engine Controls.

Did you complete the programming procedure?

Go to Step 7

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4

Was the instrument panel cluster (IPC) replaced?

Go to Step 6

Go to Step 5

5

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

Did you complete the replacement?

Go to Step 6

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6

With a scan tool, follow the instructions under the IPC SPECIAL FUNCTIONS menu to properly Synchronize the IPC with the SDM.

Did you complete the synchronize procedure?

Go to Step 7

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7
  1. Verify that all components, connectors, and CPAs are properly mounted.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

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