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Home / DTC / B1B03 — Antenna Failure

B1B03 — Antenna Failure

Detailed page for trouble code B1B03.

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B1B03

LAND ROVER B — Body

Antenna Failure

Brand: LAND ROVER
Type: B — Body
Views: UK: 12 EN: 12 RU: 13
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Physical damage to external antenna (broken mast or base)
  • Corroded or loose antenna connector or coax cable
  • Open or short in coaxial cable or wiring harness
  • Failed antenna amplifier (powered antenna module)
  • Blown fuse or loss of 12 V supply to antenna amplifier
  • Poor ground connection at antenna or amplifier

Symptoms

  • Poor or no AM/FM/DAB radio reception
  • No GPS/navigation satellite reception or inaccurate fixes
  • Hands‑free phone calls have poor reception or fail to connect
  • Loss of telematics or connected services (if antenna used for cellular/GPS)
  • Antenna/communication fault message or warning on instrument cluster/infotainment
  • Intermittent radio or navigation operation

What to check

  • Read all related fault codes with a capable scan tool and record freeze frame data
  • Inspect external antenna and mast for visible damage, movement or corrosion
  • Visually inspect antenna base, coax connector and routing for chafing or water ingress
  • Check fuses and relays for radio/antenna power circuits
  • Check connector pins for corrosion, pushed‑out pins or bent contacts
  • Measure supply voltage to antenna amplifier with ignition/radio ON (expect battery voltage or switched 12 V)

Signal parameters

  • Antenna coax continuity: near 0 ohms shield-to-shield for short runs; open if cable broken
  • Antenna impedance: nominally 50 ohms (RF path) — check with appropriate RF test equipment
  • Amplifier supply: ~12 V when radio/tuner requests powered antenna (verify with DMM)
  • Amplifier control: some systems use a switched 12 V/ground or a control line from the radio unit
  • No reliable RF carrier voltage measurable with a standard DMM; use dedicated RF diagnostics for signal strength
  • Watch for module communication frames (CAN/LIN) indicating antenna amplifier enable/diagnostic states

Diagnostic algorithm

  1. Connect diagnostic scanner, read and record B1B03 and any other stored codes; note freeze frame data and active/inactive status.
  2. Inspect antenna mast, base and visible coax routing for damage, corrosion, water ingress or loose fittings.
  3. Verify fuses/relays for infotainment/antenna amplifier; replace if blown and retest.
  4. With ignition/radio ON, backprobe the antenna amplifier power feed and ground. Confirm ~12 V supply and good ground when the radio requests power.
  5. Check continuity of the coax from the antenna to the tuner/amplifier. Look for opens or shorts and repair/replace damaged sections.
  6. Inspect connectors for bent pins/corrosion and repair or replace connectors as needed. Reseat mating units.
  7. If equipped with an external antenna amplifier, confirm amplifier operation (supply present and output present). Replace amplifier if defective.
  8. If RF test equipment is available, measure antenna signal level at the tuner input; compare with specification/expected level.
  9. Swap in a known‑good antenna, amplifier or tuner (if available and compatible) to isolate component fault.
  10. Check for software updates or recalibration procedures for the radio/telematics module; reflash if manufacturer recommends.
  11. Clear codes, perform functional test of radio/GPS/telematics and road test to confirm repair. Re-scan for reappearance of B1B03.

Likely causes

  • Loose or corroded antenna connector or coaxial cable
  • Failed antenna amplifier (most common for powered antennas)
  • Open or shorted antenna coax (broken cable or pinched harness)
  • Blown fuse or removed supply to the antenna amplifier
  • Intermittent module communication or software/firmware issue

Fault status

⚠️ Status
Antenna failure detected — antenna circuit or amplifier not operating within expected parameters. Check antenna, connectors, power/ground and tuner/module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B00 B1B01 B1B02 U0100 U1113
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Code

B1B03

MITSUBISHI B — Body

DR.ABG squib(1) short

Brand: MITSUBISHI
Type: B — Body
Views: UK: 19 EN: 18 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Physical damage to external antenna (broken mast or base)
  • Corroded or loose antenna connector or coax cable
  • Open or short in coaxial cable or wiring harness
  • Failed antenna amplifier (powered antenna module)
  • Blown fuse or loss of 12 V supply to antenna amplifier
  • Poor ground connection at antenna or amplifier

Symptoms

  • Poor or no AM/FM/DAB radio reception
  • No GPS/navigation satellite reception or inaccurate fixes
  • Hands‑free phone calls have poor reception or fail to connect
  • Loss of telematics or connected services (if antenna used for cellular/GPS)
  • Antenna/communication fault message or warning on instrument cluster/infotainment
  • Intermittent radio or navigation operation

What to check

  • Read all related fault codes with a capable scan tool and record freeze frame data
  • Inspect external antenna and mast for visible damage, movement or corrosion
  • Visually inspect antenna base, coax connector and routing for chafing or water ingress
  • Check fuses and relays for radio/antenna power circuits
  • Check connector pins for corrosion, pushed‑out pins or bent contacts
  • Measure supply voltage to antenna amplifier with ignition/radio ON (expect battery voltage or switched 12 V)

Signal parameters

  • Antenna coax continuity: near 0 ohms shield-to-shield for short runs; open if cable broken
  • Antenna impedance: nominally 50 ohms (RF path) — check with appropriate RF test equipment
  • Amplifier supply: ~12 V when radio/tuner requests powered antenna (verify with DMM)
  • Amplifier control: some systems use a switched 12 V/ground or a control line from the radio unit
  • No reliable RF carrier voltage measurable with a standard DMM; use dedicated RF diagnostics for signal strength
  • Watch for module communication frames (CAN/LIN) indicating antenna amplifier enable/diagnostic states

Diagnostic algorithm

  1. Connect diagnostic scanner, read and record B1B03 and any other stored codes; note freeze frame data and active/inactive status.
  2. Inspect antenna mast, base and visible coax routing for damage, corrosion, water ingress or loose fittings.
  3. Verify fuses/relays for infotainment/antenna amplifier; replace if blown and retest.
  4. With ignition/radio ON, backprobe the antenna amplifier power feed and ground. Confirm ~12 V supply and good ground when the radio requests power.
  5. Check continuity of the coax from the antenna to the tuner/amplifier. Look for opens or shorts and repair/replace damaged sections.
  6. Inspect connectors for bent pins/corrosion and repair or replace connectors as needed. Reseat mating units.
  7. If equipped with an external antenna amplifier, confirm amplifier operation (supply present and output present). Replace amplifier if defective.
  8. If RF test equipment is available, measure antenna signal level at the tuner input; compare with specification/expected level.
  9. Swap in a known‑good antenna, amplifier or tuner (if available and compatible) to isolate component fault.
  10. Check for software updates or recalibration procedures for the radio/telematics module; reflash if manufacturer recommends.
  11. Clear codes, perform functional test of radio/GPS/telematics and road test to confirm repair. Re-scan for reappearance of B1B03.

Likely causes

  • Loose or corroded antenna connector or coaxial cable
  • Failed antenna amplifier (most common for powered antennas)
  • Open or shorted antenna coax (broken cable or pinched harness)
  • Blown fuse or removed supply to the antenna amplifier
  • Intermittent module communication or software/firmware issue

Fault status

⚠️ Status
Antenna failure detected — antenna circuit or amplifier not operating within expected parameters. Check antenna, connectors, power/ground and tuner/module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B00 B1B01 B1B02 U0100 U1113
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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