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Removal Procedure

Remove the overhead console door (1).
Reach your hand through the access opening and disconnect the microphone connector (2) from the jumper harness.
Unsnap the microphone bracket from the overhead console.
Disconnect the microphone 2-way connector from the mating 2-way connector.

Fig 1: Identifying OnStar Microphone Components
Courtesy of GENERAL MOTORS CORP.