GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon XL - 4WD 🢒 Restraints 🢒 SIR 🢒 DTC B0081

Circuit Description

The inflatable restraint side impact sensor (SIS) circuit consists of a side impact sensor (SIS), the SIS signal circuit, and the SIS voltage circuit. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM provides input power to the SIS. When input power is first detected, the SIS responds by performing internal diagnostics. The SIS then sends an ID message to the SDM. The SDM will consider this to be a valid ID if the response time is less than 5 seconds after the SIS is powered up. The SIS will continually communicate a status message to the SDM. The SDM is capable of resetting the SIS by removing and applying power to it.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC
    • The SDM has received an ID message from the right SIS which does not match the ID stored in the SDM memory.
    • When two right SIS resets are attempted without the correct identification being detected by the SDM.

Action Taken When the DTC Sets
    • The SDM commands ON the AIR BAG indicator via Class 2 serial data.
    • The SDM attempts to reset the right SIS.

Conditions for Clearing the DTC
    • The condition responsible for setting the DTC no longer exists.
    • You can issue a scan tool CLEAR DTCs command.
    • A history DTC will clear once 255 malfunction free ignition cycles have occurred.

Diagnostic Aids

Verify that the proper right SIS is installed in the vehicle.

Test Description

The following number refers to the step number in the diagnostic table:

  1. Tests the communication status of the right SIS.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

1

Did you perform A 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, request the SIR DTC display.

Does the scan tool indicate that DTC B0081 is current?

Go to Step 3

Go to Diagnostic Aids

3

Replace the right SIS. Refer to Inflatable Restraint Side Impact Sensor Replacement .

Did you complete the replacement?

Go to Step 4

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4
  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.

Did you complete the repair?

Go to Diagnostic System Check - SIR

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