Code
B1519
ALFA ROMEO
B — Body
Bonnet switch circuit
Views:
UK: 5
EN: 5
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty bonnet/hood latch switch
- Damaged wiring or chafed harness near bonnet area
- Corroded or loose connector at switch or BCM
- Short to ground or short to battery voltage on the switch circuit
- Poor ground or power supply to the circuit
- Faulty Body Control Module (BCM) or software anomaly
Symptoms
- Bonnet-ajar warning lamp or message on dash
- Alarm does not arm or triggers unexpectedly
- Interior lights stay on after locking
- Battery discharges unexpectedly
- Central locking or immobiliser behavior linked to bonnet status is incorrect
- DTC stored in BCM memory
What to check
- Read and record all stored DTCs and freeze frame data with a capable scan tool
- Visually inspect bonnet switch, latch and connector for corrosion, damage or moisture
- Inspect wiring along bonnet hinge and into the engine bay for chafing, pinching or breaks
- Check connector pins are present, straight and making good contact
- Verify fuse(s) and power/ground related to BCM and the bonnet circuit
- Perform wiggle test on wiring/connectors while monitoring switch signal
Signal parameters
- Typical operation: switch is a two-state contact. When closed: continuity (0–1 Ω) between switch terminals.
- When open: high resistance / open circuit (>>10 kΩ).
- Voltage behaviour may vary by vehicle: common arrangement is a pull-up to battery or module supply — expect ~0–1 V (to ground) when closed and ~12 V (or module supply voltage) when open; some systems use a pull-down so polarities invert.
- Intermittent variations or voltages between 1–11 V indicate poor connection or partial short.
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1519 and any related codes; note freeze frame conditions.
- Operate bonnet switch while observing live data: confirm signal changes cleanly between states with bonnet open/closed.
- Visually inspect switch and harness at bonnet latch; remove switch and inspect terminals for corrosion/contamination.
- With ignition on (and battery support if needed), measure voltage at the switch connector with bonnet open and closed. Compare to expected (see signal_params).
- Check continuity/resistance across switch terminals with connector disconnected: closed = near 0 Ω, open = open/high resistance.
- If signal does not change or is incorrect, trace wiring back to the BCM: inspect for shorts to ground/12 V and for continuity to the module pin.
- Repair any damaged wiring, clean/replace connector or switch as required. Protect harness in hinge area after repair.
- After repair, clear codes, cycle ignition and bonnet several times, and verify the fault does not return. Re-scan for related faults.
- If wiring and switch test good but fault persists, consider BCM input diagnostics or reflashing/replacement following manufacturer procedures.
Likely causes
- Water intrusion and corrosion at bonnet switch connector
- Pinched/chafed wire at hinge area causing intermittent contact
- Switch stuck mechanically (contacts welded or dirty)
- Connector pins pushed out or bent
- Aftermarket installs (alarm/camera) disturbing the circuit
Fault status
Status
Bonnet switch circuit fault (B1519) — check bonnet/hood switch and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
B1519
FIAT
B — Body
Bonnet switch circuit
Views:
UK: 6
EN: 6
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty bonnet/hood latch switch
- Damaged wiring or chafed harness near bonnet area
- Corroded or loose connector at switch or BCM
- Short to ground or short to battery voltage on the switch circuit
- Poor ground or power supply to the circuit
- Faulty Body Control Module (BCM) or software anomaly
Symptoms
- Bonnet-ajar warning lamp or message on dash
- Alarm does not arm or triggers unexpectedly
- Interior lights stay on after locking
- Battery discharges unexpectedly
- Central locking or immobiliser behavior linked to bonnet status is incorrect
- DTC stored in BCM memory
What to check
- Read and record all stored DTCs and freeze frame data with a capable scan tool
- Visually inspect bonnet switch, latch and connector for corrosion, damage or moisture
- Inspect wiring along bonnet hinge and into the engine bay for chafing, pinching or breaks
- Check connector pins are present, straight and making good contact
- Verify fuse(s) and power/ground related to BCM and the bonnet circuit
- Perform wiggle test on wiring/connectors while monitoring switch signal
Signal parameters
- Typical operation: switch is a two-state contact. When closed: continuity (0–1 Ω) between switch terminals.
- When open: high resistance / open circuit (>>10 kΩ).
- Voltage behaviour may vary by vehicle: common arrangement is a pull-up to battery or module supply — expect ~0–1 V (to ground) when closed and ~12 V (or module supply voltage) when open; some systems use a pull-down so polarities invert.
- Intermittent variations or voltages between 1–11 V indicate poor connection or partial short.
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1519 and any related codes; note freeze frame conditions.
- Operate bonnet switch while observing live data: confirm signal changes cleanly between states with bonnet open/closed.
- Visually inspect switch and harness at bonnet latch; remove switch and inspect terminals for corrosion/contamination.
- With ignition on (and battery support if needed), measure voltage at the switch connector with bonnet open and closed. Compare to expected (see signal_params).
- Check continuity/resistance across switch terminals with connector disconnected: closed = near 0 Ω, open = open/high resistance.
- If signal does not change or is incorrect, trace wiring back to the BCM: inspect for shorts to ground/12 V and for continuity to the module pin.
- Repair any damaged wiring, clean/replace connector or switch as required. Protect harness in hinge area after repair.
- After repair, clear codes, cycle ignition and bonnet several times, and verify the fault does not return. Re-scan for related faults.
- If wiring and switch test good but fault persists, consider BCM input diagnostics or reflashing/replacement following manufacturer procedures.
Likely causes
- Water intrusion and corrosion at bonnet switch connector
- Pinched/chafed wire at hinge area causing intermittent contact
- Switch stuck mechanically (contacts welded or dirty)
- Connector pins pushed out or bent
- Aftermarket installs (alarm/camera) disturbing the circuit
Fault status
Status
Bonnet switch circuit fault (B1519) — check bonnet/hood switch and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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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 bonnet/hood latch switch
- Damaged wiring or chafed harness near bonnet area
- Corroded or loose connector at switch or BCM
- Short to ground or short to battery voltage on the switch circuit
- Poor ground or power supply to the circuit
- Faulty Body Control Module (BCM) or software anomaly
Symptoms
- Bonnet-ajar warning lamp or message on dash
- Alarm does not arm or triggers unexpectedly
- Interior lights stay on after locking
- Battery discharges unexpectedly
- Central locking or immobiliser behavior linked to bonnet status is incorrect
- DTC stored in BCM memory
What to check
- Read and record all stored DTCs and freeze frame data with a capable scan tool
- Visually inspect bonnet switch, latch and connector for corrosion, damage or moisture
- Inspect wiring along bonnet hinge and into the engine bay for chafing, pinching or breaks
- Check connector pins are present, straight and making good contact
- Verify fuse(s) and power/ground related to BCM and the bonnet circuit
- Perform wiggle test on wiring/connectors while monitoring switch signal
Signal parameters
- Typical operation: switch is a two-state contact. When closed: continuity (0–1 Ω) between switch terminals.
- When open: high resistance / open circuit (>>10 kΩ).
- Voltage behaviour may vary by vehicle: common arrangement is a pull-up to battery or module supply — expect ~0–1 V (to ground) when closed and ~12 V (or module supply voltage) when open; some systems use a pull-down so polarities invert.
- Intermittent variations or voltages between 1–11 V indicate poor connection or partial short.
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1519 and any related codes; note freeze frame conditions.
- Operate bonnet switch while observing live data: confirm signal changes cleanly between states with bonnet open/closed.
- Visually inspect switch and harness at bonnet latch; remove switch and inspect terminals for corrosion/contamination.
- With ignition on (and battery support if needed), measure voltage at the switch connector with bonnet open and closed. Compare to expected (see signal_params).
- Check continuity/resistance across switch terminals with connector disconnected: closed = near 0 Ω, open = open/high resistance.
- If signal does not change or is incorrect, trace wiring back to the BCM: inspect for shorts to ground/12 V and for continuity to the module pin.
- Repair any damaged wiring, clean/replace connector or switch as required. Protect harness in hinge area after repair.
- After repair, clear codes, cycle ignition and bonnet several times, and verify the fault does not return. Re-scan for related faults.
- If wiring and switch test good but fault persists, consider BCM input diagnostics or reflashing/replacement following manufacturer procedures.
Likely causes
- Water intrusion and corrosion at bonnet switch connector
- Pinched/chafed wire at hinge area causing intermittent contact
- Switch stuck mechanically (contacts welded or dirty)
- Connector pins pushed out or bent
- Aftermarket installs (alarm/camera) disturbing the circuit
Fault status
Status
Bonnet switch circuit fault (B1519) — check bonnet/hood switch and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
B1519
MITSUBISHI
B — Body
Connector lock
Views:
UK: 11
EN: 12
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty bonnet/hood latch switch
- Damaged wiring or chafed harness near bonnet area
- Corroded or loose connector at switch or BCM
- Short to ground or short to battery voltage on the switch circuit
- Poor ground or power supply to the circuit
- Faulty Body Control Module (BCM) or software anomaly
Symptoms
- Bonnet-ajar warning lamp or message on dash
- Alarm does not arm or triggers unexpectedly
- Interior lights stay on after locking
- Battery discharges unexpectedly
- Central locking or immobiliser behavior linked to bonnet status is incorrect
- DTC stored in BCM memory
What to check
- Read and record all stored DTCs and freeze frame data with a capable scan tool
- Visually inspect bonnet switch, latch and connector for corrosion, damage or moisture
- Inspect wiring along bonnet hinge and into the engine bay for chafing, pinching or breaks
- Check connector pins are present, straight and making good contact
- Verify fuse(s) and power/ground related to BCM and the bonnet circuit
- Perform wiggle test on wiring/connectors while monitoring switch signal
Signal parameters
- Typical operation: switch is a two-state contact. When closed: continuity (0–1 Ω) between switch terminals.
- When open: high resistance / open circuit (>>10 kΩ).
- Voltage behaviour may vary by vehicle: common arrangement is a pull-up to battery or module supply — expect ~0–1 V (to ground) when closed and ~12 V (or module supply voltage) when open; some systems use a pull-down so polarities invert.
- Intermittent variations or voltages between 1–11 V indicate poor connection or partial short.
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1519 and any related codes; note freeze frame conditions.
- Operate bonnet switch while observing live data: confirm signal changes cleanly between states with bonnet open/closed.
- Visually inspect switch and harness at bonnet latch; remove switch and inspect terminals for corrosion/contamination.
- With ignition on (and battery support if needed), measure voltage at the switch connector with bonnet open and closed. Compare to expected (see signal_params).
- Check continuity/resistance across switch terminals with connector disconnected: closed = near 0 Ω, open = open/high resistance.
- If signal does not change or is incorrect, trace wiring back to the BCM: inspect for shorts to ground/12 V and for continuity to the module pin.
- Repair any damaged wiring, clean/replace connector or switch as required. Protect harness in hinge area after repair.
- After repair, clear codes, cycle ignition and bonnet several times, and verify the fault does not return. Re-scan for related faults.
- If wiring and switch test good but fault persists, consider BCM input diagnostics or reflashing/replacement following manufacturer procedures.
Likely causes
- Water intrusion and corrosion at bonnet switch connector
- Pinched/chafed wire at hinge area causing intermittent contact
- Switch stuck mechanically (contacts welded or dirty)
- Connector pins pushed out or bent
- Aftermarket installs (alarm/camera) disturbing the circuit
Fault status
Status
Bonnet switch circuit fault (B1519) — check bonnet/hood switch and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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0
Send to email
Code
B1519
Other
B — Body
Hood Switch Circuit Failure
Views:
UK: 28
EN: 27
RU: 18
AI status
Completed
Completed
100%
Causes
- Faulty bonnet/hood latch switch
- Damaged wiring or chafed harness near bonnet area
- Corroded or loose connector at switch or BCM
- Short to ground or short to battery voltage on the switch circuit
- Poor ground or power supply to the circuit
- Faulty Body Control Module (BCM) or software anomaly
Symptoms
- Bonnet-ajar warning lamp or message on dash
- Alarm does not arm or triggers unexpectedly
- Interior lights stay on after locking
- Battery discharges unexpectedly
- Central locking or immobiliser behavior linked to bonnet status is incorrect
- DTC stored in BCM memory
What to check
- Read and record all stored DTCs and freeze frame data with a capable scan tool
- Visually inspect bonnet switch, latch and connector for corrosion, damage or moisture
- Inspect wiring along bonnet hinge and into the engine bay for chafing, pinching or breaks
- Check connector pins are present, straight and making good contact
- Verify fuse(s) and power/ground related to BCM and the bonnet circuit
- Perform wiggle test on wiring/connectors while monitoring switch signal
Signal parameters
- Typical operation: switch is a two-state contact. When closed: continuity (0–1 Ω) between switch terminals.
- When open: high resistance / open circuit (>>10 kΩ).
- Voltage behaviour may vary by vehicle: common arrangement is a pull-up to battery or module supply — expect ~0–1 V (to ground) when closed and ~12 V (or module supply voltage) when open; some systems use a pull-down so polarities invert.
- Intermittent variations or voltages between 1–11 V indicate poor connection or partial short.
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1519 and any related codes; note freeze frame conditions.
- Operate bonnet switch while observing live data: confirm signal changes cleanly between states with bonnet open/closed.
- Visually inspect switch and harness at bonnet latch; remove switch and inspect terminals for corrosion/contamination.
- With ignition on (and battery support if needed), measure voltage at the switch connector with bonnet open and closed. Compare to expected (see signal_params).
- Check continuity/resistance across switch terminals with connector disconnected: closed = near 0 Ω, open = open/high resistance.
- If signal does not change or is incorrect, trace wiring back to the BCM: inspect for shorts to ground/12 V and for continuity to the module pin.
- Repair any damaged wiring, clean/replace connector or switch as required. Protect harness in hinge area after repair.
- After repair, clear codes, cycle ignition and bonnet several times, and verify the fault does not return. Re-scan for related faults.
- If wiring and switch test good but fault persists, consider BCM input diagnostics or reflashing/replacement following manufacturer procedures.
Likely causes
- Water intrusion and corrosion at bonnet switch connector
- Pinched/chafed wire at hinge area causing intermittent contact
- Switch stuck mechanically (contacts welded or dirty)
- Connector pins pushed out or bent
- Aftermarket installs (alarm/camera) disturbing the circuit
Fault status
Status
Bonnet switch circuit fault (B1519) — check bonnet/hood switch and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
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Was this AI description helpful?
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Send to email