Attempting to pair a Bluetooth mobile phone may fail on some slower systems.

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Article ID: 2018487 - View products that this article applies to.
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Symptoms

When running Windows 7 on systems with lower end processors (for example Intel Celeron or AMD Sempron) you may not be able to successfully pair older Bluetooth mobile phones with the system. This can be seen especially when the pairing is initiated from within Windows rather than directly from the phone.

It should be noted that if you experience this problem you will not be presented with every pairing option as you progress through the "Add a device" Bluetooth pairing wizard in Windows. The below "Select a pairing option" will fail to appear. If you are not presented with this dialog please use the recommended resolution below.

Select a pairing option dialog

Cause

Depending on the region the mobile phone was meant for and depending on the Bluetooth version used for in the mobile phone there can be different lengths of PIN codes used for securing the Bluetooth connection. Windows 7 by default generates longer 8 digit PIN codes to make a more secure connection. By default these mobile phones generate either 4 or 6 digit PIN codes.

During the pairing process initiated from within Windows 7 there is a timing issue on slower systems causing the phone to be unpairable.

Resolution

The current recommended workaround is to initiate the pairing process from the mobile phone itself generating a 4 digit PIN and manually pair the mobile phone with Windows.

More Information

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 2018487 - Last Review: March 10, 2010 - Revision: 3.0
APPLIES TO
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Ultimate
Keywords: 
KB2018487

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