GM Service Manual Online
For 1990-2009 cars only

RADIO/TELEPHONE INSTALLATION RECOMMENDATION (DFI USE)

THE FOLLOWING ARE GENERAL GUIDELINES FOR INSTALLING A RADIOTELEPHONE INTO A CADILLAC DIGITAL FUEL INJECTED VEHICLE. UNDER NO CIRCUMSTANCES ARE DEALERS TO ATTEMPT MODIFICATIONS OF ORIGINAL INSTALLATIONS. THESE GUIDELINES ARE PROVIDED SO THAT DEALERS CAN COMMUNICATE THIS INFORMATION TO LOCAL MOBILE TELEPHONE INSTALLERS WHEN NECESSARY. 1.TRANSMITTER LOCATION: LOCATE THE TRANSMITTER IN THE TRUNK, PREFERABLY TO ONE SIDE AS CONVENIENT. 2.ANTENNA LOCATION: THE ANTENNA SHOULD BE OF THE PERMANENT MOUNT TYPE, NOT MAGNETIC, LOCATED IN THE CENTER OF THE REAR DECK LID AND HAVING A POSITIVE GROUND CONNECTION. 3.WIRING: THE CONNECTIONS REQUIRED FOR MOST RADIOTELEPHONE INSTALLATIONS ARE: (1) BATTERY AND GROUND FOR THE TRANSMITTER, (2) BATTERY FOR THE HANDSET, (3) THE ANTENNA LEAD-IN, (4) A MULTICONDUCTOR SIGNAL CABLE BETWEEN THE HANDSET AND THE TRANSMITTER. SOME INSTALLATIONS ARE MADE WITH A TIE TO IGNITION AS A SIGNAL ONLY (AS OPPOSED TO A POWER FEED). A.CONNECTION LOCATIONS: 1.BATTERY, GROUND, HANDSET BATTERY: THESE CONNECTIONS SHOULD BE MADE DIRECTLY TO THE BATTERY ITSELF, INCLUDING THE GROUND. THE TRANSMITTER POWER FEEDS SHOULD BE #10 AWG WIRE OR LARGER, TWISTED IF POSSIBLE, AND THE GROUND SHOULD NOT BE CONNECTED TO THE BODY AT ANY POINT. IN-LINE FUSES SHOULD BE LOCATED UNDER HOOD AS CLOSE AS PRACTICAL TO THE BATTERY. 2.IGNITION: WHEN REQUIRING THE IGNITION SIGNAL (AS OPPOSED TO A POWER FEED), USE THE IGNITION 3 CIRCUIT WITH A TERMINAL SO LABELED ON THE LEFT UNDER DASH FUSE BLOCK. A SKETCH OF FUSE BLOCK IS LOCATED IN THE OWNER'S MANUAL. B.LINE ROUTING: THE POWER LEADS SHOULD BE BROUGHT THROUGH THE RH GROMMET AND RUN THROUGH THE CABLE TROUGH UNDER THE RH DOOR SILLS, UNDER THE REAR SEAT, AND INTO THE TRUNK THROUGH THE REAR BULKHEAD. ATTEMPT TO MAINTAIN DISTANCE BETWEEN THE POWER LEADS AND SENSITIVE ELECTRONICS (PRESSURE SENSORS AND ELECTRONIC CONTROL MODULE) LOCATED IN THE RIGHT SIDE OF THE DASH.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.