Power is supplied from the CD/PH fuse in the rear fuse block via CKT 2240 (ORN) to the cellular telephone module at terminals 8 and to the cellular telephone handset terminal D. The module is grounded at terminals 7 via CKT 1351 (BLK) to ground G202.

Power is supplied to the cellular telephone handset at terminal E from the RDO/PH fuse in the rear fuse block via CKT 43 (YEL) when ignition is in RUN or ACC and during retained accessory power. The handset is grounded at terminal K via CKT 1351 (BLK/WHT) to ground G202. The handset contains a keypad, display, microphone and ear speaker. The handset communicates signals to the cellular telephone module by coax cable.

When the handset is place in its docking cup, the phone operates in the hands-free mode. This mode allows the driver's voice to be received by the roof-mounted microphone. During hands-free mode, the vehicle radio mutes and the incoming cellular telephone audio is routed through the radio's speakers. When the handset is removed from its cup, the hands-free feature is disabled and the radio is unmuted. The handset must be held to the driver's head for voice conversation.

The cellular telephone microphone is wired to the cellular telephone handset via CKT 655 (GRY) and CKT 2012 (DK GRN). During hands-free operation, the module provides stereo audio output to the vehicle audio system on CKT 367 (BRN/WHT) and CKT 368 (DK GRN).

The module communicates on the Class 2 serial data line CKT 1807 (PPL), which the module uses for transmission of messages, status and diagnostic information.