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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Communication (2 Of 2) >> 91 Communication >> Retrofitting Transmitter/Receiver Units >> General Information

General Information

Before installing radios and telephone systems (transmitter/receiver unit), disconnect the negative terminal of the Battery -A-. Refer to BATTERY .

Use the applicable wiring diagrams. Refer to the appropriate Wiring Diagram(s).

Secure wiring harnesses to cable ties. Wrap connector couplings with foam to prevent rattling.

Follow the manufacturer operating and installation instructions for cell phones, radios and antennas. Refer to the appropriate Operating Instructions.