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Home / DTC / B2973 — AM/FM1 Radio Antenna No Connection State(Main Ant.)

B2973 — AM/FM1 Radio Antenna No Connection State(Main Ant.)

Detailed page for trouble code B2973.

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22,491specific
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Code

B2973

HYUNDAI B — Body

AM/FM1 Radio Antenna No Connection State(Main Ant.)

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Physical disconnection at antenna base or radio connector
  • Broken or cut antenna coax cable
  • Failed antenna mast or integrated antenna module
  • Failed antenna amplifier (power or internal failure)
  • Corroded or water-damaged connectors
  • Blown fuse or no 12V supply to antenna amplifier/control

Symptoms

  • No AM/FM reception or very weak reception on AM/FM1 band
  • Intermittent radio signal or static noise
  • Radio displays antenna-related warning or code
  • Reception only when using external/aux antenna or phone audio
  • No change in signal when radio gain is adjusted

What to check

  • Scan for B-codes and related radio/BCM codes with a diagnostic tool
  • Visual inspection of roof/fin antenna and base for damage or loose fasteners
  • Inspect antenna connector at base and at the back of the radio for corrosion, bent pins or disconnection
  • Check relevant fuses and relays for the radio/antenna amplifier
  • Measure for 12V supply (with ignition ACC/ON) to antenna amplifier power feed if equipped
  • Perform continuity check of coax from radio antenna socket to antenna base (check for open circuit)

Signal parameters

  • Antenna coax continuity: near short/low resistance; an open circuit indicates break (exact ohms depend on system)
  • Antenna system impedance: typically in the 50–75 Ω range (RF characteristic, not a DC ohm measurement)
  • Antenna amplifier power feed: ~12 V with ignition/radio ON (if amplifier powered)
  • Ground continuity: good chassis ground between antenna mount and vehicle body
  • RF signal level at head unit (if supported): should show a measurable level; complete absence suggests open circuit

Diagnostic algorithm

  1. Read and record freeze-frame and all stored codes; note any related radio/BCM codes.
  2. Visually inspect the antenna mast and base for damage, corrosion, water entry or loose mounting hardware.
  3. Verify fuses and 12V power feed to the antenna amplifier or powered antenna with a multimeter (ignition/radio ON).
  4. Remove radio or access antenna connector at head unit. Inspect the coax connector for damage or corrosion and reconnect securely.
  5. Perform a continuity test from the radio antenna socket center conductor to the antenna mast center pin; an open indicates a broken coax or connector.
  6. Check ground continuity from antenna mounting to chassis ground.
  7. If present, verify amplifier control line (if separate) and measure expected control voltage when radio is ON.
  8. If continuity and power are good but no signal, bench-test or substitute a known-good antenna or head unit to isolate radio vs antenna/amplifier fault.
  9. Repair or replace the damaged coax, connector, antenna mast/module, or antenna amplifier as indicated. Reassemble and clear codes.
  10. Re-test radio reception and road-test to confirm fault does not return; rescan for codes.

Likely causes

  • Loose or corroded connector at antenna base
  • Open or shorted coax between antenna and head unit
  • Failed antenna amplifier (no power or internal open)
  • Damaged antenna mast/module from impact or theft attempt
  • Water ingress/corrosion at antenna connector

Fault status

⚠️ Status
AM/FM1 radio main antenna not detected or no connection to main antenna (possible open circuit, failed powered antenna/amplifier, or connector/wiring fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2970 B2971 B2972 B2974 B2975
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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