Roof Antenna Module
The fin or pod on the roof, and it is not a radio aerial. On a modern vehicle it houses most of the connections to the outside world in one place: the AM/FM and digital radio aerials and their amplifier, the satellite positioning antenna, the mobile data antenna for connected services and emergency calling, and frequently the receivers for keyless entry, remote locking and the tyre pressure sensors.
Which produces a diagnostic pattern worth recognising: poor radio reception, satellite navigation that cannot find the vehicle, connected services unavailable and unreliable keyless entry, all at once. Four unrelated complaints, one housing.
It is reached by dropping the headlining — for sunroof repairs, curtain airbags, roof consoles or aerial work — and the connectors are frequently left unseated afterwards. Roof bars and boxes crush the cable run; car washes catch the fin.
The fin's gasket is also a known water path, and the water does not stay there — it runs down inside the headlining to the lowest point, which is why a damp pillar trim or a wet seat can share a cause with a reception fault.
Also known as: shark fin, roof aerial, aerial, antenna module, roof antenna, antenna amplifier, gps antenna, aerial amplifier
Referenced by 19 codes
Codes involving this component (19)
- U0198 Lost Communication With Telematic Control Module High
- U0499 Invalid Data Received From Telematic Control Module High
- U0163 Lost Communication With Navigation Control Module Moderate
- U0169 Lost Communication With Sunroof Control Module Moderate
- U0185 Lost Communication With Antenna Control Module Moderate
- U0197 Lost Communication With Telephone Control Module Moderate
- U0464 Invalid Data Received From Navigation Control Module Moderate
- U0486 Invalid Data Received From Antenna Control Module Moderate
- U0498 Invalid Data Received From Telephone Control Module Moderate
- U0161 Lost Communication With Compass Module Low
- U0188 Lost Communication With Digital Disc Player/Changer Module B Low
- U0191 Lost Communication With Television Low
- U0195 Lost Communication With Subscription Entertainment Receiver Module Low
- U0462 Invalid Data Received From Compass Module Low
- U0489 Invalid Data Received From Digital Disc Player/Changer Module B Low
- U0492 Invalid Data Received From Television Low
- U0496 Invalid Data Received From Subscription Entertainment Receiver Module Low
- U0515 Invalid Data Received From Remote Function Actuation Module Low
- U0559 Invalid Data Received From Radio Transceiver Low
Other components in Electrical and Charging
- Data Bus 563
- Battery 218
- Gateway Module 158
- Stability Control Module 122
- Battery Temperature Sensor 115
- Infotainment Head Unit 49
- Alternator 45
- Brake Booster Pressure Sensor 39
- A/C Refrigerant Pressure Sensor 33
- Brake Light Switch 32
- Cruise Control Switch 31
- Ignition Switch 31
- Cooling Fan Relay 28
- Starter Relay 25
- A/C Compressor 25
- Clutch Switch 24
- ECM Power Relay 21
- Immobiliser 15
- Lighting Driver Control Module 15
- Starter Motor 14
- Transmission Control Module Power Relay 14
- Fuel Pump Relay 13
- Secondary Air Injection Relay 13
- Battery Monitoring Sensor 10
- Driver Information Centre 10
- A/C Evaporator Temperature Sensor 8
- Telematics Control Module 8
- Navigation Control Module 6
- Headlamp Levelling Actuator 6
- Hydraulic Pump Relay 5
- Head-Up Display 2
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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