Code
B1331
ALFA ROMEO
B — Body
Tailgate open circuit
Views:
UK: 23
EN: 31
RU: 25
AI status
Completed
Completed
100%
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
- Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
- Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
- Check fuses and general power/ground for the tailgate/BCM circuits.
- 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.
- 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.
- If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
- Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
- After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
- 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
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Code
B1331
FIAT
B — Body
Tailgate open circuit
Views:
UK: 18
EN: 32
RU: 22
AI status
Completed
Completed
100%
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
- Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
- Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
- Check fuses and general power/ground for the tailgate/BCM circuits.
- 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.
- 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.
- If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
- Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
- After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
- 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
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Code
B1331
HUMMER
B — Body
Right A/C Discharge Sensor Fault
Views:
UK: 18
EN: 24
RU: 30
AI status
Completed
Completed
100%
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
- Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
- Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
- Check fuses and general power/ground for the tailgate/BCM circuits.
- 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.
- 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.
- If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
- Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
- After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
- 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
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Code
B1331
LAND ROVER
B — Body
Tampa of the open luggage compartment rear door - failure of circuit
Views:
UK: 23
EN: 29
RU: 32
AI status
Completed
Completed
100%
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
- Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
- Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
- Check fuses and general power/ground for the tailgate/BCM circuits.
- 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.
- 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.
- If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
- Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
- After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
- 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
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Code
B1331
Other
B — Body
Decklid Ajar Rear Door Circuit Failure
Views:
UK: 31
EN: 46
RU: 36
AI status
Completed
Completed
100%
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
- Connect a diagnostic scanner, confirm B1331 and note any related codes. Clear codes and attempt to reproduce.
- Inspect the tailgate latch/sensor assembly and visible wiring for physical damage, corrosion, or water ingress.
- Check fuses and general power/ground for the tailgate/BCM circuits.
- 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.
- 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.
- If intermittent, perform wiggle tests while monitoring live data to find intermittent breaks.
- Repair or replace damaged wiring, connectors or the tailgate switch as required. Protect repaired sections with grommets and strain relief at hinge points.
- After repair, clear codes and re-test multiple open/close cycles to confirm the fault does not return.
- 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
Your experience will help others
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Was this AI description helpful?
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👍 Like
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0
Send to email