GM Service Manual Online
For 1990-2009 cars only

General Cellular Description

The cellular phone connector is taped back to the main wiring harness and is located at the right front of the center console. To access the connector, removal of the right instrument panel lower extension side panel is required, which is described in this section. A connection kit is available through an authorized retailer. The connector provides constant and accessory position battery power outputs and ground connection for the cellular phone. It also provides the following connections that interface with the radio when a telephone hands-free kit with the appropriate functions is connected.

Radio Telephone Mute

Whenever a call is made or received, the radio will display VOICE IN and the volume of the radio will be muted or the CD will be paused. A suitable hands-free cellular phone kit with a mute output function is required to be connected to mute circuit of the cellular phone connector.

Radio Telephone Input

Important: Before connecting a cellular phone hands-free kit to the vehicle, refer to the relevant installation or operators manual(s) for the correct installation procedures.

This function allows the audio from a suitable hands-free cellular telephone kit to be reproduced through the radio speakers. A suitable hands-free cellular phone kit with mute output and external speaker functions is required and is connected to the mute circuit , voice signal circuit and voice return circuit of the cellular phone connector. The phone input has independent tone from the normal audio sources. The bass, treble, fader and balance can be adjusted to suit the particular phone/preference whenever VOICE IN is displayed on the radio. These settings will then be used whenever the phone input is activated, and does not interfere with the settings for radio or CD playback. With both functions, the radio returns to the previous playing mode and audio settings when the call ends.