Code
B1519
LAND ROVER
B — Body
Hood ajar switch - circuit failure
Views:
UK: 5
EN: 9
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty hood latch / hood ajar switch
- Broken, pinched or chafed wiring in the hood harness
- Corroded or loose connector at the switch or BCM
- Short to ground or short to battery voltage on the switch feed or signal
- Poor ground or power supply to the circuit
- Water ingress in connector or switch
Symptoms
- Hood-open warning lamp or dash message illuminated or stuck
- Alarm or immobilizer may false-trigger or refuse to arm
- Central locking or security features behaving erratically
- Hood warning remains on even when hood is closed
- Intermittent warning that changes with vibration or hood movement
What to check
- Read stored and pending codes and view live data/hood-switch state with a diagnostic scanner
- Visual inspection of hood latch, switch and wiring harness for damage, corrosion, water
- Inspect and reseat connector at hood latch and BCM; check for bent pins
- Wiggle test harness while observing live data to reproduce an intermittent
- Check related fuses and power/ground circuits
Signal parameters
- Switch expected to report a binary state (open/closed) to BCM
- Closed switch continuity: low resistance (≈0–1 Ω); open switch: high resistance / OL
- Signal voltage (depending on design): near 0 V when pulled to ground or near battery voltage when pulled up — check manufacturer's wiring diagram
- Circuit current very low; switch is not a powered sensor (no high current draw)
- Live-data should toggle consistently when operating the hood latch
Diagnostic algorithm
- Connect a scan tool, confirm B1519 present and monitor live data for the hood ajar switch while operating the hood.
- Perform a careful visual inspection of the hood latch, switch, wiring along the hinge area and connector for corrosion, damage, or water intrusion.
- With ignition ON (engine off), back-probe the connector at the hood switch and verify signal voltage/state with hood open and closed. Compare to expected behavior from live data.
- Measure continuity/resistance across the switch terminals with the switch actuated. Expect near-zero ohms when closed and open/infinite when open. Replace switch if out of spec.
- If the switch tests good, trace the wiring to the BCM: check for continuity to the module connector, and check for shorts to ground or to battery using an isolation meter or multimeter.
- Repair any damaged wires, clean or replace corroded connectors, and secure harness routing to prevent chafing at the hinge.
- After repairs, clear codes, perform multiple open/close cycles and road/garage tests to confirm code does not return and that live data remains stable.
- If wiring and switch are good and the fault persists, investigate BCM inputs and communication; consider module diagnostics or replacement only after wiring/switch are confirmed good.
Likely causes
- Connector at hood latch is corroded, loose or disconnected
- Mechanical failure of the hood ajar switch inside the latch
- Wiring damage between the hood latch and BCM (pinch on hood hinge area)
- Short circuit to power or ground on the switch signal
- Fault in BCM (least likely)
Fault status
Status
Hood ajar switch - circuit failure (open/short/intermittent detected)
Repair difficulty: Medium
Diagnostic time: 0.5 - 1.5 hours
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