B2103

Code

Other B — Body

Antenna Not Connected

Brand: Other

Type: B — Body

Views: UK: 33 EN: 50 RU: 46

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No or very poor AM/FM reception
Loss of satellite radio, GPS, Bluetooth or telematics reception (if that antenna is affected)
Remote/keyless entry intermittent or non-functional (if same antenna used)
Antenna-related warnings or message on the dash or infotainment
Stored DTC B2103 and possibly related communication codes

Read and record DTC from affected module with a scan tool; note any related codes or freeze frame data
Visually inspect antenna(s), roofline, pillar, or rear glass mounting area and connectors for damage or separation
Inspect wiring harness routing for chafing, pinched or broken coax and look for aftermarket splices
Check connectors for corrosion, bent pins or pushed-out terminals
Verify fuses and power/ground circuits for any antenna amplifier
Perform a wiggle test on harness/connectors while monitoring live data or radio reception

Power/ground wiring continuity: expected low resistance (
RF antenna line: center conductor should not be shorted to shield/ground; characteristic impedance typically ~50 Ω (requires RF test equipment)
Open-circuit detection: module expects measurable continuity or load on RF line — open/OL indicates not connected
Amplified antenna: verify supply voltage at amplifier connector (typical 12 V when active)
No communication errors on related CAN/LIN networks when antenna is reconnected

Connect a professional scan tool and read B2103 and any related codes. Save freeze-frame and live data.
Inspect the antenna mounting area and connectors for obvious damage, corrosion or disconnection. Repair or reseat connectors if found.
Check fuses and power/ground for any antenna amplifier. Measure supply voltage with ignition on.
Trace the antenna coax/wiring from the antenna to the module; visually inspect and flex harness to find intermittent breaks or chafe points.
Use a multimeter to check continuity of power/ground circuits (
Disconnect any aftermarket radio or alarm equipment that may have replaced or disconnected the factory antenna and retest.
If wiring and connectors are good but no RF signal or amplifier power is present, replace the antenna assembly (or antenna amplifier) and retest.
If replacement antenna and wiring check OK but code persists, consider module connector pins and/or module internal fault. Consult manufacturer service information for module replacement/repair procedures.
Clear the DTC, perform functional checks (radio reception, keyless entry, telematics) and verify code does not return after road test or extended functional test.