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Home / DTC / B1333 — Tailgate open circuit

B1333 — Tailgate open circuit

Detailed page for trouble code B1333.

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Code

B1333

ALFA ROMEO B — Body

Tailgate open circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 22 EN: 35 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring in the tailgate harness (common at hinge area)
  • Corroded or loose connector at the tailgate latch or body control module (BCM)
  • Failed tailgate latch switch or integrated position sensor
  • Poor ground or power supply to the latch/sensor circuit
  • Water ingress or corrosion inside the latch or connector
  • Faulty BCM or software/firmware communication error

Symptoms

  • Tailgate open warning lamp/messages illuminated while tailgate is closed
  • Interior trunk/tailgate light remains ON
  • Central locking does not lock/unlock tailgate
  • Alarm may not arm or may give false alarms
  • Battery drain when vehicle is parked
  • Inability to detect tailgate closed for vehicle systems (e.g., auto-lock)

What to check

  • Read stored fault codes and freeze-frame with a diagnostic tool; record any related B-codes
  • Visually inspect tailgate latch, harness, and connectors for damage, corrosion, or intrusion
  • Operate tailgate while observing connector/harness for pinching or broken wires (wiggle test)
  • Check relevant fuses and relays supplying the tailgate circuit
  • Perform continuity test of the latch switch circuit from latch to BCM connector
  • Measure supply voltage and ground at the latch connector with tailgate open and closed

Signal parameters

  • Typical latch switch: closed = continuity (near 0 Ω) between switch terminals; open = OL / infinite Ω
  • Voltage-type sensors: closed/secure = approx. 0 V or chassis ground (if switch to ground), open = approx. 12 V (pulled up by BCM) — verify with service manual
  • Signal toggles when tailgate is opened/closed; steady invalid/unavailable signal indicates open circuit
  • No communication packets from a dedicated tailgate control module may indicate module or CAN wiring issue

Diagnostic algorithm

  1. Connect a diagnostic scanner and confirm B1333 and any related codes. Note whether the code is permanent, stored, or intermittent.
  2. Ask the owner for symptom details (when it occurs, after rain, after door closing). Try to reproduce the fault.
  3. Visually inspect the tailgate seal area, latch and harness routing through the hinge boot. Look for chafing, broken wires, corrosion or water entry.
  4. With ignition ON, backprobe the tailgate latch connector. Observe signal voltage/continuity while operating the latch (open/close). Compare to expected values in signal_params.
  5. If no signal or intermittent, perform continuity/resistance check from latch connector to the BCM connector to locate open circuit or high resistance. Pay attention to the hinge area where wires flex.
  6. Inspect and clean connectors; reseat or replace corroded terminals. Repair or splice damaged wires using correct automotive techniques and strain relief in the hinge area.
  7. If wiring and switch test good, verify power/ground at the BCM for the circuit. Check BCM grounds and supply fuses/relays.
  8. If wiring, switch, power and ground are correct but fault persists, investigate BCM input circuit or tailgate control module (if separate). Check for software updates or resets from OEM literature before replacement.
  9. After repairs, clear codes and perform several open/close cycles and road test to confirm the fault is resolved and no new codes are stored.

Likely causes

  • Damaged wiring at the tailgate hinge causing intermittent open circuit
  • Failed or stuck tailgate latch sensor
  • Corroded connector at tailgate latch
  • Poor ground at tailgate or BCM
  • Connector pin pushed out or broken

Fault status

⚠️ Status
Tailgate open circuit detected — the latch/position sensor signal is absent or open. This may prevent correct detection of a closed tailgate and can cause warning messages, lighting or locking faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1330 B1331 B1332 B1334 B1340
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Code

B1333

FIAT B — Body

Tailgate open circuit

Brand: FIAT
Type: B — Body
Views: UK: 13 EN: 31 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring in the tailgate harness (common at hinge area)
  • Corroded or loose connector at the tailgate latch or body control module (BCM)
  • Failed tailgate latch switch or integrated position sensor
  • Poor ground or power supply to the latch/sensor circuit
  • Water ingress or corrosion inside the latch or connector
  • Faulty BCM or software/firmware communication error

Symptoms

  • Tailgate open warning lamp/messages illuminated while tailgate is closed
  • Interior trunk/tailgate light remains ON
  • Central locking does not lock/unlock tailgate
  • Alarm may not arm or may give false alarms
  • Battery drain when vehicle is parked
  • Inability to detect tailgate closed for vehicle systems (e.g., auto-lock)

What to check

  • Read stored fault codes and freeze-frame with a diagnostic tool; record any related B-codes
  • Visually inspect tailgate latch, harness, and connectors for damage, corrosion, or intrusion
  • Operate tailgate while observing connector/harness for pinching or broken wires (wiggle test)
  • Check relevant fuses and relays supplying the tailgate circuit
  • Perform continuity test of the latch switch circuit from latch to BCM connector
  • Measure supply voltage and ground at the latch connector with tailgate open and closed

Signal parameters

  • Typical latch switch: closed = continuity (near 0 Ω) between switch terminals; open = OL / infinite Ω
  • Voltage-type sensors: closed/secure = approx. 0 V or chassis ground (if switch to ground), open = approx. 12 V (pulled up by BCM) — verify with service manual
  • Signal toggles when tailgate is opened/closed; steady invalid/unavailable signal indicates open circuit
  • No communication packets from a dedicated tailgate control module may indicate module or CAN wiring issue

Diagnostic algorithm

  1. Connect a diagnostic scanner and confirm B1333 and any related codes. Note whether the code is permanent, stored, or intermittent.
  2. Ask the owner for symptom details (when it occurs, after rain, after door closing). Try to reproduce the fault.
  3. Visually inspect the tailgate seal area, latch and harness routing through the hinge boot. Look for chafing, broken wires, corrosion or water entry.
  4. With ignition ON, backprobe the tailgate latch connector. Observe signal voltage/continuity while operating the latch (open/close). Compare to expected values in signal_params.
  5. If no signal or intermittent, perform continuity/resistance check from latch connector to the BCM connector to locate open circuit or high resistance. Pay attention to the hinge area where wires flex.
  6. Inspect and clean connectors; reseat or replace corroded terminals. Repair or splice damaged wires using correct automotive techniques and strain relief in the hinge area.
  7. If wiring and switch test good, verify power/ground at the BCM for the circuit. Check BCM grounds and supply fuses/relays.
  8. If wiring, switch, power and ground are correct but fault persists, investigate BCM input circuit or tailgate control module (if separate). Check for software updates or resets from OEM literature before replacement.
  9. After repairs, clear codes and perform several open/close cycles and road test to confirm the fault is resolved and no new codes are stored.

Likely causes

  • Damaged wiring at the tailgate hinge causing intermittent open circuit
  • Failed or stuck tailgate latch sensor
  • Corroded connector at tailgate latch
  • Poor ground at tailgate or BCM
  • Connector pin pushed out or broken

Fault status

⚠️ Status
Tailgate open circuit detected — the latch/position sensor signal is absent or open. This may prevent correct detection of a closed tailgate and can cause warning messages, lighting or locking faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1330 B1331 B1332 B1334 B1340
Repair manuals

Manual library for FIAT

29

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Code

B1333

HUMMER B — Body

Right Heater Discharge Sensor Fault

Brand: HUMMER
Type: B — Body
Views: UK: 14 EN: 44 RU: 24
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring in the tailgate harness (common at hinge area)
  • Corroded or loose connector at the tailgate latch or body control module (BCM)
  • Failed tailgate latch switch or integrated position sensor
  • Poor ground or power supply to the latch/sensor circuit
  • Water ingress or corrosion inside the latch or connector
  • Faulty BCM or software/firmware communication error

Symptoms

  • Tailgate open warning lamp/messages illuminated while tailgate is closed
  • Interior trunk/tailgate light remains ON
  • Central locking does not lock/unlock tailgate
  • Alarm may not arm or may give false alarms
  • Battery drain when vehicle is parked
  • Inability to detect tailgate closed for vehicle systems (e.g., auto-lock)

What to check

  • Read stored fault codes and freeze-frame with a diagnostic tool; record any related B-codes
  • Visually inspect tailgate latch, harness, and connectors for damage, corrosion, or intrusion
  • Operate tailgate while observing connector/harness for pinching or broken wires (wiggle test)
  • Check relevant fuses and relays supplying the tailgate circuit
  • Perform continuity test of the latch switch circuit from latch to BCM connector
  • Measure supply voltage and ground at the latch connector with tailgate open and closed

Signal parameters

  • Typical latch switch: closed = continuity (near 0 Ω) between switch terminals; open = OL / infinite Ω
  • Voltage-type sensors: closed/secure = approx. 0 V or chassis ground (if switch to ground), open = approx. 12 V (pulled up by BCM) — verify with service manual
  • Signal toggles when tailgate is opened/closed; steady invalid/unavailable signal indicates open circuit
  • No communication packets from a dedicated tailgate control module may indicate module or CAN wiring issue

Diagnostic algorithm

  1. Connect a diagnostic scanner and confirm B1333 and any related codes. Note whether the code is permanent, stored, or intermittent.
  2. Ask the owner for symptom details (when it occurs, after rain, after door closing). Try to reproduce the fault.
  3. Visually inspect the tailgate seal area, latch and harness routing through the hinge boot. Look for chafing, broken wires, corrosion or water entry.
  4. With ignition ON, backprobe the tailgate latch connector. Observe signal voltage/continuity while operating the latch (open/close). Compare to expected values in signal_params.
  5. If no signal or intermittent, perform continuity/resistance check from latch connector to the BCM connector to locate open circuit or high resistance. Pay attention to the hinge area where wires flex.
  6. Inspect and clean connectors; reseat or replace corroded terminals. Repair or splice damaged wires using correct automotive techniques and strain relief in the hinge area.
  7. If wiring and switch test good, verify power/ground at the BCM for the circuit. Check BCM grounds and supply fuses/relays.
  8. If wiring, switch, power and ground are correct but fault persists, investigate BCM input circuit or tailgate control module (if separate). Check for software updates or resets from OEM literature before replacement.
  9. After repairs, clear codes and perform several open/close cycles and road test to confirm the fault is resolved and no new codes are stored.

Likely causes

  • Damaged wiring at the tailgate hinge causing intermittent open circuit
  • Failed or stuck tailgate latch sensor
  • Corroded connector at tailgate latch
  • Poor ground at tailgate or BCM
  • Connector pin pushed out or broken

Fault status

⚠️ Status
Tailgate open circuit detected — the latch/position sensor signal is absent or open. This may prevent correct detection of a closed tailgate and can cause warning messages, lighting or locking faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1330 B1331 B1332 B1334 B1340
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

B1333

LAND ROVER B — Body

Passenger side - rear seat switch assembly

Brand: LAND ROVER
Type: B — Body
Views: UK: 15 EN: 41 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring in the tailgate harness (common at hinge area)
  • Corroded or loose connector at the tailgate latch or body control module (BCM)
  • Failed tailgate latch switch or integrated position sensor
  • Poor ground or power supply to the latch/sensor circuit
  • Water ingress or corrosion inside the latch or connector
  • Faulty BCM or software/firmware communication error

Symptoms

  • Tailgate open warning lamp/messages illuminated while tailgate is closed
  • Interior trunk/tailgate light remains ON
  • Central locking does not lock/unlock tailgate
  • Alarm may not arm or may give false alarms
  • Battery drain when vehicle is parked
  • Inability to detect tailgate closed for vehicle systems (e.g., auto-lock)

What to check

  • Read stored fault codes and freeze-frame with a diagnostic tool; record any related B-codes
  • Visually inspect tailgate latch, harness, and connectors for damage, corrosion, or intrusion
  • Operate tailgate while observing connector/harness for pinching or broken wires (wiggle test)
  • Check relevant fuses and relays supplying the tailgate circuit
  • Perform continuity test of the latch switch circuit from latch to BCM connector
  • Measure supply voltage and ground at the latch connector with tailgate open and closed

Signal parameters

  • Typical latch switch: closed = continuity (near 0 Ω) between switch terminals; open = OL / infinite Ω
  • Voltage-type sensors: closed/secure = approx. 0 V or chassis ground (if switch to ground), open = approx. 12 V (pulled up by BCM) — verify with service manual
  • Signal toggles when tailgate is opened/closed; steady invalid/unavailable signal indicates open circuit
  • No communication packets from a dedicated tailgate control module may indicate module or CAN wiring issue

Diagnostic algorithm

  1. Connect a diagnostic scanner and confirm B1333 and any related codes. Note whether the code is permanent, stored, or intermittent.
  2. Ask the owner for symptom details (when it occurs, after rain, after door closing). Try to reproduce the fault.
  3. Visually inspect the tailgate seal area, latch and harness routing through the hinge boot. Look for chafing, broken wires, corrosion or water entry.
  4. With ignition ON, backprobe the tailgate latch connector. Observe signal voltage/continuity while operating the latch (open/close). Compare to expected values in signal_params.
  5. If no signal or intermittent, perform continuity/resistance check from latch connector to the BCM connector to locate open circuit or high resistance. Pay attention to the hinge area where wires flex.
  6. Inspect and clean connectors; reseat or replace corroded terminals. Repair or splice damaged wires using correct automotive techniques and strain relief in the hinge area.
  7. If wiring and switch test good, verify power/ground at the BCM for the circuit. Check BCM grounds and supply fuses/relays.
  8. If wiring, switch, power and ground are correct but fault persists, investigate BCM input circuit or tailgate control module (if separate). Check for software updates or resets from OEM literature before replacement.
  9. After repairs, clear codes and perform several open/close cycles and road test to confirm the fault is resolved and no new codes are stored.

Likely causes

  • Damaged wiring at the tailgate hinge causing intermittent open circuit
  • Failed or stuck tailgate latch sensor
  • Corroded connector at tailgate latch
  • Poor ground at tailgate or BCM
  • Connector pin pushed out or broken

Fault status

⚠️ Status
Tailgate open circuit detected — the latch/position sensor signal is absent or open. This may prevent correct detection of a closed tailgate and can cause warning messages, lighting or locking faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1330 B1331 B1332 B1334 B1340
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B1333

Other B — Body

Decklid Ajar Rear Door Circuit Short To Battery

Brand: Other
Type: B — Body
Views: UK: 27 EN: 55 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring in the tailgate harness (common at hinge area)
  • Corroded or loose connector at the tailgate latch or body control module (BCM)
  • Failed tailgate latch switch or integrated position sensor
  • Poor ground or power supply to the latch/sensor circuit
  • Water ingress or corrosion inside the latch or connector
  • Faulty BCM or software/firmware communication error

Symptoms

  • Tailgate open warning lamp/messages illuminated while tailgate is closed
  • Interior trunk/tailgate light remains ON
  • Central locking does not lock/unlock tailgate
  • Alarm may not arm or may give false alarms
  • Battery drain when vehicle is parked
  • Inability to detect tailgate closed for vehicle systems (e.g., auto-lock)

What to check

  • Read stored fault codes and freeze-frame with a diagnostic tool; record any related B-codes
  • Visually inspect tailgate latch, harness, and connectors for damage, corrosion, or intrusion
  • Operate tailgate while observing connector/harness for pinching or broken wires (wiggle test)
  • Check relevant fuses and relays supplying the tailgate circuit
  • Perform continuity test of the latch switch circuit from latch to BCM connector
  • Measure supply voltage and ground at the latch connector with tailgate open and closed

Signal parameters

  • Typical latch switch: closed = continuity (near 0 Ω) between switch terminals; open = OL / infinite Ω
  • Voltage-type sensors: closed/secure = approx. 0 V or chassis ground (if switch to ground), open = approx. 12 V (pulled up by BCM) — verify with service manual
  • Signal toggles when tailgate is opened/closed; steady invalid/unavailable signal indicates open circuit
  • No communication packets from a dedicated tailgate control module may indicate module or CAN wiring issue

Diagnostic algorithm

  1. Connect a diagnostic scanner and confirm B1333 and any related codes. Note whether the code is permanent, stored, or intermittent.
  2. Ask the owner for symptom details (when it occurs, after rain, after door closing). Try to reproduce the fault.
  3. Visually inspect the tailgate seal area, latch and harness routing through the hinge boot. Look for chafing, broken wires, corrosion or water entry.
  4. With ignition ON, backprobe the tailgate latch connector. Observe signal voltage/continuity while operating the latch (open/close). Compare to expected values in signal_params.
  5. If no signal or intermittent, perform continuity/resistance check from latch connector to the BCM connector to locate open circuit or high resistance. Pay attention to the hinge area where wires flex.
  6. Inspect and clean connectors; reseat or replace corroded terminals. Repair or splice damaged wires using correct automotive techniques and strain relief in the hinge area.
  7. If wiring and switch test good, verify power/ground at the BCM for the circuit. Check BCM grounds and supply fuses/relays.
  8. If wiring, switch, power and ground are correct but fault persists, investigate BCM input circuit or tailgate control module (if separate). Check for software updates or resets from OEM literature before replacement.
  9. After repairs, clear codes and perform several open/close cycles and road test to confirm the fault is resolved and no new codes are stored.

Likely causes

  • Damaged wiring at the tailgate hinge causing intermittent open circuit
  • Failed or stuck tailgate latch sensor
  • Corroded connector at tailgate latch
  • Poor ground at tailgate or BCM
  • Connector pin pushed out or broken

Fault status

⚠️ Status
Tailgate open circuit detected — the latch/position sensor signal is absent or open. This may prevent correct detection of a closed tailgate and can cause warning messages, lighting or locking faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1330 B1331 B1332 B1334 B1340
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