Code
B2950
HYUNDAI
B — Body
DMB Antenna Connection & Receive Quality
Views:
UK: 11
EN: 20
RU: 20
AI status
Completed
Completed
100%
Causes
- Loose, corroded or disconnected antenna connector
- Damaged or shorted antenna coaxial cable
- Failed/weak antenna amplifier or power feed (if equipped)
- Damaged antenna assembly (broken mast, element)
- Poor ground or high resistance in antenna circuit
- Interference from nearby electrical noise or metal obstruction
Symptoms
- No DMB reception or severely reduced number of channels
- Intermittent reception, dropouts or static in DMB audio/video
- Weak signal indication or low signal strength reading in head unit
- DMB-related warning/message on infotainment display
- Other radio reception unaffected (if separate systems) or degraded concurrently
What to check
- Retrieve and record freeze-frame data and related codes with a diagnostic scanner
- Visual inspection of roof/antenna assembly for physical damage or missing parts
- Inspect antenna base connector and head unit harness for loose pins, corrosion, or water intrusion
- Wiggle test antenna and coax while monitoring signal quality or watching for code reappearance
- Check for aftermarket equipment or recent body repairs that may have disturbed antenna routing
- Verify audio/head unit software is up-to-date and no known TSB applies
Signal parameters
- Antenna voltage (if active antenna present) — typically 5–12 V supply
- Received signal strength (RSSI) or signal level displayed in head unit (dB or level bars)
- Signal-to-noise ratio (SNR) or digital lock/BER (bit error rate) if available in diagnostics
- Continuity and resistance of coaxial cable (ohms) and shield integrity
- Connector pin voltages and ground resistance (ohms)
Diagnostic algorithm
- Connect an appropriate diagnostic scanner and confirm B2950 and any related codes; record module data and signal level if available.
- Perform a visual inspection: check antenna assembly, mast, and base for damage, corrosion, or water entry; inspect cable routing for chafing.
- At the antenna base, inspect and reseat the connector; clean corrosion and apply dielectric grease if required.
- At the head unit or amplifier, inspect connector pins and harness; disconnect and check for continuity between antenna center conductor and receiver input while moving the cable to detect intermittent wiring faults.
- Measure antenna supply voltage (if active antenna) at the connector with ignition in the required position. If supply is absent, trace power feed and check fuses/relays and ground.
- Measure coax continuity and shield integrity with an ohmmeter; check for short to ground or high resistance.
- If an inline amplifier is present, verify its operation by observing signal level with and without the amplifier connected, or temporarily substitute a known-good amplifier/antenna if available.
- Perform a wiggle test while monitoring signal strength and watch for changes or code set events; this helps locate intermittent connectors or broken conductors.
- If wiring and antenna check good, connect a known-good antenna or bypass the amplifier to isolate head unit/module vs antenna hardware.
- After any repair or replacement, clear stored codes, recheck signal parameters and perform a road/test reception check across multiple channels and locations to confirm repair.
- If no hardware fault is found, check for software updates, reprogram the infotainment/body module if directed by service information, and consult technical service bulletins.
- If the problem persists, escalate to module-level diagnosis (scope diagnostics, module swap) or consult dealer/service manuals for manufacturer-specific tests.
Likely causes
- Corroded or loose antenna connector at roof or head unit
- Damaged coaxial cable (kink, crush, broken shield) between antenna and receiver
- Failed antenna amplifier or its power supply circuit
- Antenna assembly mechanically damaged or missing
- Intermittent connection caused by movement/vibration
Fault status
Status
DMB antenna connection or receive quality fault detected — signal level/connection outside allowable range. Inspect antenna, cabling, amplifier and related circuits.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
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