Article ID : 00025260 / Last Modified : 06/09/2014

The letters ATT show in the display window of the car stereo.

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The Attenuation (ATT) function is designed to mute the car stereo when you receive a telephone call. If ATT is displayed but there is no incoming phone call being received or no cell phone is installed in the vehicle, there may be a problem with the installation of the car stereo.

NOTE: We recommended that you contact a qualified installer to check the installation.

If the issue is still unresolved, service may be required. Begin the procedure to send your Sony product into a Sony facility to be repaired.