B2495

Code

LAND ROVER B — Body

Anti-theft horn output - circuit failure

Brand: LAND ROVER

Type: B — Body

Views: UK: 17 EN: 22 RU: 15

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Page language: EN

Causes

Blown fuse for horn/anti-theft circuit
Faulty horn(s) or internal short in horn
Open or shorted wiring between BCM and horn (including corroded connectors)
Faulty horn relay or driver transistor in BCM
Aftermarket alarm or wiring modifications interfering with circuit
Faulty Body Control Module (BCM) or immobilizer module

Symptoms

Alarm chirp/siren does not use vehicle horn (no horn sound on alarm)
Horn does not sound when tested via vehicle controls
DTC B2495 stored in BCM or immobilizer module
Intermittent horn operation or only works when tapped/wiggled
Possible battery drain if circuit shorted

What to check

Scan for stored codes and related modules; note freeze-frame data and event count
Visually inspect horn(s), wiring, connectors and mounting for damage or corrosion
Check horn/anti-theft related fuses and relays for continuity and proper seating
Activate alarm/horn output while measuring voltage at horn connector
Perform continuity/short-to-ground tests on harness between BCM and horn
Disconnect aftermarket alarm components and retest if present

Signal parameters

Resting voltage at horn output: approx. 0 V
Activated voltage at horn connector: close to battery voltage (approx. 11–14 V)
Horn coil/resistance (typical): 1–10 ohms (varies by horn type) — verify manufacturer spec
Relay coil resistance (if external): typically 70–140 ohms
BCM output driver current: limited — expected pulse/steady drive up to horn current; excessive current suggests short

Diagnostic algorithm

Read and record all DTCs from BCM and related modules. Clear codes and attempt to re-create the fault to verify repeatability.
Inspect fuses and relays for the horn/anti-theft circuit; replace any blown fuse and retest.
Visually inspect horn(s) and wiring harnesses for damage, pin corrosion, poor ground, or disconnected connectors.
With a helper, activate the alarm/horn output while measuring voltage at the horn connector. If no voltage, move upstream: check relay output and BCM pin voltage when commanded.
If voltage is present at horn connector but the horn does not sound, bench-test the horn by applying battery voltage directly. Replace horn if it fails to operate.
If no activation voltage at the horn but relay clicks, check relay contacts and replace relay if suspect. If relay not present and BCM drives horn directly, test continuity from BCM to horn; check for short to ground/short to supply.
Repair any wiring faults (replace damaged wiring, repair corroded connectors). Use manufacturer wiring diagrams to identify correct pins and colors.
If wiring and horn check good and output still not present, suspect BCM/immobilizer driver fault. Verify with module testing (scope preferred) and consider module programming/replace only after confirming wiring and loads.
After repairs clear codes and perform multiple actuations of alarm/horn to confirm no reoccurrence and restore normal operation.

Likely causes

Blown fuse or faulty horn relay
Open/poor connection at horn connector (corrosion, broken pin)
Short to ground on horn feed or return wiring
Failed horn unit (speaker element)
BCM driver fault (less common)

Fault status

⚠️ Status

Anti‑theft horn output circuit failure detected — horn output not driving as expected. Check fuses, wiring, horn and BCM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5 - 2.0 hours

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B2495 — Anti-theft horn output - circuit failure