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Home / DTC / B1331 — Tailgate open circuit

B1331 — Tailgate open circuit

Detailed page for trouble code B1331.

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22,461specific
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Code

B1331

ALFA ROMEO B — Body

Tailgate open circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 3 EN: 8 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in tailgate harness (common at hinge/boot area)
  • Corroded, loose or damaged connector at tailgate latch/sensor
  • Failed tailgate open/latch switch or sensor
  • Water ingress or corrosion in tailgate connector or latch assembly
  • Blown fuse or poor ground related to the tailgate circuit
  • Faulty BCM or module input (rare)

Symptoms

  • Trunk/tailgate open warning lamp or message on the dash
  • Interior/cargo lights remain on or do not behave correctly
  • Central locking may not lock/unlock the tailgate
  • Alarm may trigger or show tailgate open
  • Inability to detect tailgate closed status (affects convenience features)

What to check

  • Read stored/freeze-frame data with a scan tool and confirm B1331 present
  • Visually inspect tailgate latch, switch and wiring harness at hinge for damage
  • Check connectors for corrosion, bent pins, or poor contact
  • Verify fuses/power and ground for the tailgate/BCM circuits
  • Use a multimeter to check continuity and resistance of the switch and wiring
  • Perform a wiggle test on the harness while observing live data for intermittent faults

Signal parameters

  • Expected switch behavior: closed vs open state should change circuit continuity (closed ≈ low resistance; open ≈ high resistance).
  • Typical voltage: signal line will normally be low (near 0 V) or pulled to battery voltage (~12 V) depending on circuit design — verify against model-specific wiring diagram.
  • Check for stable voltage without intermittent drops when operating the tailgate.
  • Continuity: closed switch ≈ 0–5 Ω; open switch ≈ OL (infinite) — compare to spec.

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
  2. Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
  3. Check fuses and general power/ground for the tailgate/BCM circuits.
  4. Probe the tailgate switch connector with a multimeter while operating the latch: verify expected voltage or continuity changes. If uncertain, consult vehicle wiring diagram to identify pinouts.
  5. Perform continuity test from the BCM (or junction connector) to the tailgate switch to locate open circuit, paying attention to harness sections that flex at the hinge.
  6. If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
  7. Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
  8. After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
  9. If wiring and switch check good but fault persists, verify BCM inputs and harness grounds; replace BCM only after exhausting wiring/hardware checks and confirming module fault with advanced diagnostics.

Likely causes

  • Damaged wiring at the tailgate hinge where harness flexes when opened/closed
  • Faulty tailgate latch/sensor
  • Corroded/loose connector at the latch
  • Water damage in the latch area

Fault status

⚠️ Status
Tailgate open circuit detected — open/failed tailgate open switch circuit or wiring fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1330 B1345 B1370
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Code

B1331

FIAT B — Body

Tailgate open circuit

Brand: FIAT
Type: B — Body
Views: UK: 4 EN: 8 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in tailgate harness (common at hinge/boot area)
  • Corroded, loose or damaged connector at tailgate latch/sensor
  • Failed tailgate open/latch switch or sensor
  • Water ingress or corrosion in tailgate connector or latch assembly
  • Blown fuse or poor ground related to the tailgate circuit
  • Faulty BCM or module input (rare)

Symptoms

  • Trunk/tailgate open warning lamp or message on the dash
  • Interior/cargo lights remain on or do not behave correctly
  • Central locking may not lock/unlock the tailgate
  • Alarm may trigger or show tailgate open
  • Inability to detect tailgate closed status (affects convenience features)

What to check

  • Read stored/freeze-frame data with a scan tool and confirm B1331 present
  • Visually inspect tailgate latch, switch and wiring harness at hinge for damage
  • Check connectors for corrosion, bent pins, or poor contact
  • Verify fuses/power and ground for the tailgate/BCM circuits
  • Use a multimeter to check continuity and resistance of the switch and wiring
  • Perform a wiggle test on the harness while observing live data for intermittent faults

Signal parameters

  • Expected switch behavior: closed vs open state should change circuit continuity (closed ≈ low resistance; open ≈ high resistance).
  • Typical voltage: signal line will normally be low (near 0 V) or pulled to battery voltage (~12 V) depending on circuit design — verify against model-specific wiring diagram.
  • Check for stable voltage without intermittent drops when operating the tailgate.
  • Continuity: closed switch ≈ 0–5 Ω; open switch ≈ OL (infinite) — compare to spec.

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
  2. Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
  3. Check fuses and general power/ground for the tailgate/BCM circuits.
  4. Probe the tailgate switch connector with a multimeter while operating the latch: verify expected voltage or continuity changes. If uncertain, consult vehicle wiring diagram to identify pinouts.
  5. Perform continuity test from the BCM (or junction connector) to the tailgate switch to locate open circuit, paying attention to harness sections that flex at the hinge.
  6. If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
  7. Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
  8. After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
  9. If wiring and switch check good but fault persists, verify BCM inputs and harness grounds; replace BCM only after exhausting wiring/hardware checks and confirming module fault with advanced diagnostics.

Likely causes

  • Damaged wiring at the tailgate hinge where harness flexes when opened/closed
  • Faulty tailgate latch/sensor
  • Corroded/loose connector at the latch
  • Water damage in the latch area

Fault status

⚠️ Status
Tailgate open circuit detected — open/failed tailgate open switch circuit or wiring fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1330 B1345 B1370
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Code

B1331

HUMMER B — Body

Right A/C Discharge Sensor Fault

Brand: HUMMER
Type: B — Body
Views: UK: 4 EN: 9 RU: 13
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in tailgate harness (common at hinge/boot area)
  • Corroded, loose or damaged connector at tailgate latch/sensor
  • Failed tailgate open/latch switch or sensor
  • Water ingress or corrosion in tailgate connector or latch assembly
  • Blown fuse or poor ground related to the tailgate circuit
  • Faulty BCM or module input (rare)

Symptoms

  • Trunk/tailgate open warning lamp or message on the dash
  • Interior/cargo lights remain on or do not behave correctly
  • Central locking may not lock/unlock the tailgate
  • Alarm may trigger or show tailgate open
  • Inability to detect tailgate closed status (affects convenience features)

What to check

  • Read stored/freeze-frame data with a scan tool and confirm B1331 present
  • Visually inspect tailgate latch, switch and wiring harness at hinge for damage
  • Check connectors for corrosion, bent pins, or poor contact
  • Verify fuses/power and ground for the tailgate/BCM circuits
  • Use a multimeter to check continuity and resistance of the switch and wiring
  • Perform a wiggle test on the harness while observing live data for intermittent faults

Signal parameters

  • Expected switch behavior: closed vs open state should change circuit continuity (closed ≈ low resistance; open ≈ high resistance).
  • Typical voltage: signal line will normally be low (near 0 V) or pulled to battery voltage (~12 V) depending on circuit design — verify against model-specific wiring diagram.
  • Check for stable voltage without intermittent drops when operating the tailgate.
  • Continuity: closed switch ≈ 0–5 Ω; open switch ≈ OL (infinite) — compare to spec.

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
  2. Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
  3. Check fuses and general power/ground for the tailgate/BCM circuits.
  4. Probe the tailgate switch connector with a multimeter while operating the latch: verify expected voltage or continuity changes. If uncertain, consult vehicle wiring diagram to identify pinouts.
  5. Perform continuity test from the BCM (or junction connector) to the tailgate switch to locate open circuit, paying attention to harness sections that flex at the hinge.
  6. If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
  7. Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
  8. After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
  9. If wiring and switch check good but fault persists, verify BCM inputs and harness grounds; replace BCM only after exhausting wiring/hardware checks and confirming module fault with advanced diagnostics.

Likely causes

  • Damaged wiring at the tailgate hinge where harness flexes when opened/closed
  • Faulty tailgate latch/sensor
  • Corroded/loose connector at the latch
  • Water damage in the latch area

Fault status

⚠️ Status
Tailgate open circuit detected — open/failed tailgate open switch circuit or wiring fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1330 B1345 B1370
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Keep it short and practical. Up to 500 characters.
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Code

B1331

LAND ROVER B — Body

Tampa of the open luggage compartment rear door - failure of circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 7 EN: 9 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in tailgate harness (common at hinge/boot area)
  • Corroded, loose or damaged connector at tailgate latch/sensor
  • Failed tailgate open/latch switch or sensor
  • Water ingress or corrosion in tailgate connector or latch assembly
  • Blown fuse or poor ground related to the tailgate circuit
  • Faulty BCM or module input (rare)

Symptoms

  • Trunk/tailgate open warning lamp or message on the dash
  • Interior/cargo lights remain on or do not behave correctly
  • Central locking may not lock/unlock the tailgate
  • Alarm may trigger or show tailgate open
  • Inability to detect tailgate closed status (affects convenience features)

What to check

  • Read stored/freeze-frame data with a scan tool and confirm B1331 present
  • Visually inspect tailgate latch, switch and wiring harness at hinge for damage
  • Check connectors for corrosion, bent pins, or poor contact
  • Verify fuses/power and ground for the tailgate/BCM circuits
  • Use a multimeter to check continuity and resistance of the switch and wiring
  • Perform a wiggle test on the harness while observing live data for intermittent faults

Signal parameters

  • Expected switch behavior: closed vs open state should change circuit continuity (closed ≈ low resistance; open ≈ high resistance).
  • Typical voltage: signal line will normally be low (near 0 V) or pulled to battery voltage (~12 V) depending on circuit design — verify against model-specific wiring diagram.
  • Check for stable voltage without intermittent drops when operating the tailgate.
  • Continuity: closed switch ≈ 0–5 Ω; open switch ≈ OL (infinite) — compare to spec.

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
  2. Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
  3. Check fuses and general power/ground for the tailgate/BCM circuits.
  4. Probe the tailgate switch connector with a multimeter while operating the latch: verify expected voltage or continuity changes. If uncertain, consult vehicle wiring diagram to identify pinouts.
  5. Perform continuity test from the BCM (or junction connector) to the tailgate switch to locate open circuit, paying attention to harness sections that flex at the hinge.
  6. If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
  7. Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
  8. After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
  9. If wiring and switch check good but fault persists, verify BCM inputs and harness grounds; replace BCM only after exhausting wiring/hardware checks and confirming module fault with advanced diagnostics.

Likely causes

  • Damaged wiring at the tailgate hinge where harness flexes when opened/closed
  • Faulty tailgate latch/sensor
  • Corroded/loose connector at the latch
  • Water damage in the latch area

Fault status

⚠️ Status
Tailgate open circuit detected — open/failed tailgate open switch circuit or wiring fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1330 B1345 B1370
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Code

B1331

Other B — Body

Decklid Ajar Rear Door Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 19 EN: 30 RU: 24
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in tailgate harness (common at hinge/boot area)
  • Corroded, loose or damaged connector at tailgate latch/sensor
  • Failed tailgate open/latch switch or sensor
  • Water ingress or corrosion in tailgate connector or latch assembly
  • Blown fuse or poor ground related to the tailgate circuit
  • Faulty BCM or module input (rare)

Symptoms

  • Trunk/tailgate open warning lamp or message on the dash
  • Interior/cargo lights remain on or do not behave correctly
  • Central locking may not lock/unlock the tailgate
  • Alarm may trigger or show tailgate open
  • Inability to detect tailgate closed status (affects convenience features)

What to check

  • Read stored/freeze-frame data with a scan tool and confirm B1331 present
  • Visually inspect tailgate latch, switch and wiring harness at hinge for damage
  • Check connectors for corrosion, bent pins, or poor contact
  • Verify fuses/power and ground for the tailgate/BCM circuits
  • Use a multimeter to check continuity and resistance of the switch and wiring
  • Perform a wiggle test on the harness while observing live data for intermittent faults

Signal parameters

  • Expected switch behavior: closed vs open state should change circuit continuity (closed ≈ low resistance; open ≈ high resistance).
  • Typical voltage: signal line will normally be low (near 0 V) or pulled to battery voltage (~12 V) depending on circuit design — verify against model-specific wiring diagram.
  • Check for stable voltage without intermittent drops when operating the tailgate.
  • Continuity: closed switch ≈ 0–5 Ω; open switch ≈ OL (infinite) — compare to spec.

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
  2. Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
  3. Check fuses and general power/ground for the tailgate/BCM circuits.
  4. Probe the tailgate switch connector with a multimeter while operating the latch: verify expected voltage or continuity changes. If uncertain, consult vehicle wiring diagram to identify pinouts.
  5. Perform continuity test from the BCM (or junction connector) to the tailgate switch to locate open circuit, paying attention to harness sections that flex at the hinge.
  6. If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
  7. Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
  8. After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
  9. If wiring and switch check good but fault persists, verify BCM inputs and harness grounds; replace BCM only after exhausting wiring/hardware checks and confirming module fault with advanced diagnostics.

Likely causes

  • Damaged wiring at the tailgate hinge where harness flexes when opened/closed
  • Faulty tailgate latch/sensor
  • Corroded/loose connector at the latch
  • Water damage in the latch area

Fault status

⚠️ Status
Tailgate open circuit detected — open/failed tailgate open switch circuit or wiring fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1330 B1345 B1370
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  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
  • 2.3 Disconnecting and connecting battery
  • 2.4 Removing and installing battery
  • - Remove luggage compartment side trim (right-side)
  • - Connect battery charger for back-up power
  • - Detach earth and positive cables, central venting hose
  • - Remove battery retainer plate and lift battery out
  • - Installation notes, adaptation via Vehicle diagnostic tester
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Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685

Workshop Manual
Years: 2021 Manual in English Pages: 186 82.7 MB
Short description

Official Audi Service Training self‑study programme SSP 685 for the Audi Q4 e‑tron (Type F4). Covers body, power units, power transmission, running gear, electrics & electronics, high‑voltage system, thermal management, driver assist and infotainment. Intended for internal service training and technical familiarisation; not a workshop repair manual.

199,00 UAH
Contents
Key sections:
  • Introduction
  • - Introduction to Audi Q4 e-tron
  • - Dimensions
  • Body
  • - Body structure and materials
  • - Joining techniques
  • - Securing high-voltage battery and force progression
  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
  • Power units
  • - Technical data: rear electric motor (VX90)
  • - Technical data: front electric motor (VX89)
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

199,00 UAH
Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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