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Home / DTC / B2648 — Antenna circuit - open circuit 3

B2648 — Antenna circuit - open circuit 3

Detailed page for trouble code B2648.

34,151codes
59brands
11,660generic
22,491specific
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Code

B2648

LAND ROVER B — Body

Antenna circuit - open circuit 3

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

Causes

  • Broken or disconnected antenna feed/coax cable
  • Corroded or loose antenna connector
  • Failed antenna element or mast motor
  • Failed antenna amplifier or antenna module
  • Blown fuse or lost power/ground to antenna circuit
  • Damaged wiring harness (chafing, pinched, broken wires)

Symptoms

  • No or very poor AM/FM radio reception on affected band/port
  • Navigation or satellite radio poor reception (if same antenna used)
  • Hands‑free phone call quality degraded or unable to connect
  • Antenna mast does not extend/retract (if motorized)
  • Stored or active antenna fault warning(s) in instrument panel

What to check

  • Read all stored and pending DTCs with a capable scan tool; note related B‑codes
  • Visual inspection of antenna mast, base, and wiring for damage or corrosion
  • Inspect connectors at the antenna and at the head unit/module for corrosion, bent pins or disconnection
  • Check relevant fuse(s) and fusible links for the radio/antenna circuit
  • Measure continuity of coax and power/ground wires between the antenna and the radio/module
  • Verify supply voltage and ground at the antenna harness with ignition and radio on

Signal parameters

  • Antenna power supply: ~12 V (switched) when radio/ignition on (if active antenna/amplifier present)
  • Antenna control line: may be 0–12 V or a data line depending on system; consult wiring diagram
  • Coax continuity: near 0 ohms or specified low impedance from antenna center conductor to head unit input; open = OL/infinite
  • Shield/ground continuity: low ohms between antenna shield and chassis ground
  • Antenna amplifier input/output: expected signal presence on coax when receiving stations; absence indicates open or failed amp

Diagnostic algorithm

  1. Scan for DTCs: record B2648 and any associated antenna/radio/communication codes.
  2. Visual inspection: inspect antenna mast, base, connectors and wiring for damage, water ingress or corrosion. Repair obvious faults and retest.
  3. Verify fuses: check and replace any blown fuses for the radio/antenna circuit.
  4. Check power/ground: with ignition/radio on, measure voltage at antenna power pin and verify a good ground at the antenna connector.
  5. Continuity test: disconnect connectors and measure continuity of center conductor (signal) and shield between the head unit/module connector and the antenna. An open indicates broken wiring or connector.
  6. Inspect connectors: open and inspect connectors for corrosion, bent pins or poor contacts. Clean or replace as necessary.
  7. Bypass/test antenna amplifier: if an inline amplifier is present, check for supply to amplifier and test by temporarily connecting a known good antenna or short coax (where appropriate) to isolate amplifier vs wiring fault.
  8. Check for short-to-ground: measure resistance from signal conductor to ground to ensure no short. High resistance/open or short to ground indicates fault location.
  9. Use scope or signal injector: if available, inject a known RF/signal at the head unit and see if it reaches the antenna or vice versa to locate open section.
  10. Replace suspected faulty component: replace antenna, amplifier or harness only after verifying fault with measurements. Clear codes and road/test to verify repair.
  11. If intermittent: perform wiggle testing, recheck connectors after driving, and consider replacement of harness or connector if intermittent open detected.

Likely causes

  • Open/disconnected coax or power lead at the roof antenna
  • Connector corrosion at antenna or radio/module
  • Faulty antenna amplifier (internal open)
  • Open wiring between head unit/module and antenna (broken conductor)
  • Blown fuse providing power to the antenna amplifier

Fault status

⚠️ Status
Antenna circuit 3 open — no continuity or signal detected on antenna 3 circuit. Radio/antenna module reported an open circuit condition.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2647 B2649 B2633 B2638
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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