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Home / DTC / B1881 — Right seat belt pre-tensioner - open circuit

B1881 — Right seat belt pre-tensioner - open circuit

Detailed page for trouble code B1881.

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Code

B1881

LAND ROVER B — Body

Right seat belt pre-tensioner - open circuit

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring in the pretensioner circuit (commonly under/around the seat)
  • Corroded, bent, or pushed-out connector pins at the seat harness or SRS module
  • Disconnected seat/airbag connector after seat removal or service
  • Failed (deployed or internally open) right seat belt pre-tensioner
  • Blown fuse or poor power/ground affecting SRS circuit
  • Faulty SRS/airbag control module or internal diagnostics failure

Symptoms

  • SRS / airbag warning lamp illuminated or flashing
  • Seat belt pre-tensioner may not deploy in a crash (latent risk)
  • Stored B1881 code visible with a diagnostic scanner
  • Possible related SRS codes present (airbag, seat belt circuits)

What to check

  • Scan SRS module with a capable diagnostic tool; record B1881 and any related codes and freeze-frame data
  • Visual inspection of right seat wiring harness, connectors and seat-belt pretensioner plug for damage, corrosion or loose pins
  • Check that seat connectors are fully seated and locking tabs are intact after any seat removal
  • Measure continuity/resistance across the pretensioner connector (compare to manufacturer specification)
  • Check related fuses and battery voltage; verify proper ground connections
  • Wiggle harness while monitoring live data or continuity to reproduce intermittent opens

Signal parameters

  • Pretensioner coil resistance: typically low (manufacturer-specific; commonly ~0.5–3 Ω). An open circuit shows infinite / OL.
  • Connector continuity between pretensioner and SRS module: should show low resistance; open = infinite
  • Circuit supply voltage: battery voltage present at SRS module power pins with ignition on (verify before/after service)
  • Diagnostic tool status: SRS module reports open-circuit fault for right seat belt pre-tensioner

Diagnostic algorithm

  1. Read and record all SRS codes and freeze-frame data using a manufacturer-capable scan tool.
  2. Follow safety procedure: switch off ignition, disconnect negative battery terminal and wait the manufacturer-recommended time (commonly 2–10 minutes) to disable airbag reserves before working on SRS wiring.
  3. Visually inspect the right front seat area: seat belt pretensioner connector, under-seat harness, seat reclining/slide areas and connector locking tabs for damage or disconnected plugs.
  4. With battery safely disconnected, unplug the pretensioner connector and inspect pins for corrosion, damage or pushed-out terminals. Repair or replace damaged connector.
  5. Measure resistance across the pretensioner at the connector. Compare to manufacturer spec. If resistance is infinite/OL, the pretensioner coil or wiring is open.
  6. If pretensioner is open, measure continuity from the pretensioner connector back to the SRS module connector to locate open section. Repair broken wires, chafed sections or bad crimp joints; replace wiring if necessary.
  7. If pretensioner resistance is within spec but code persists, check connector-pin-to-pin continuity and for shorts to ground/other circuits. Check related fuses and module power/ground.
  8. If wiring and connector are good but the fault remains, consider replacing the pretensioner assembly (if deployed or internally failed) or evaluate the SRS control module using dealer-level diagnostics.
  9. After repairs, reconnect everything, restore battery, clear codes with scanner and perform SRS system tests/relearn procedures per manufacturer. Verify the SRS warning lamp extinguishes and no related codes return.
  10. If intermittent faults reappear, perform wiggle/road test with live-data monitoring and re-check harness routing and strain relief at seat mounts.

Likely causes

  • Open/interrupt in the pre-tensioner wiring harness under the seat from movement or abrasion
  • Poor connector contact (corrosion, bent pin, locking tab not fully engaged)
  • Pretensioner has deployed previously or failed internally (open coil)
  • Loose/removed seat harness connector after service

Fault status

⚠️ Status
Right seat belt pre-tensioner circuit open — continuity lost to right pretensioner (inspect connectors, wiring, and pretensioner). SRS warning lamp likely illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–3.0 hours

Similar codes

B1880 B1882 B1861 B1862 B1000
267

Browse 267 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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Code

B1881

Other B — Body

Seatbelt Passenger Pretensioner Circuit Open

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring in the pretensioner circuit (commonly under/around the seat)
  • Corroded, bent, or pushed-out connector pins at the seat harness or SRS module
  • Disconnected seat/airbag connector after seat removal or service
  • Failed (deployed or internally open) right seat belt pre-tensioner
  • Blown fuse or poor power/ground affecting SRS circuit
  • Faulty SRS/airbag control module or internal diagnostics failure

Symptoms

  • SRS / airbag warning lamp illuminated or flashing
  • Seat belt pre-tensioner may not deploy in a crash (latent risk)
  • Stored B1881 code visible with a diagnostic scanner
  • Possible related SRS codes present (airbag, seat belt circuits)

What to check

  • Scan SRS module with a capable diagnostic tool; record B1881 and any related codes and freeze-frame data
  • Visual inspection of right seat wiring harness, connectors and seat-belt pretensioner plug for damage, corrosion or loose pins
  • Check that seat connectors are fully seated and locking tabs are intact after any seat removal
  • Measure continuity/resistance across the pretensioner connector (compare to manufacturer specification)
  • Check related fuses and battery voltage; verify proper ground connections
  • Wiggle harness while monitoring live data or continuity to reproduce intermittent opens

Signal parameters

  • Pretensioner coil resistance: typically low (manufacturer-specific; commonly ~0.5–3 Ω). An open circuit shows infinite / OL.
  • Connector continuity between pretensioner and SRS module: should show low resistance; open = infinite
  • Circuit supply voltage: battery voltage present at SRS module power pins with ignition on (verify before/after service)
  • Diagnostic tool status: SRS module reports open-circuit fault for right seat belt pre-tensioner

Diagnostic algorithm

  1. Read and record all SRS codes and freeze-frame data using a manufacturer-capable scan tool.
  2. Follow safety procedure: switch off ignition, disconnect negative battery terminal and wait the manufacturer-recommended time (commonly 2–10 minutes) to disable airbag reserves before working on SRS wiring.
  3. Visually inspect the right front seat area: seat belt pretensioner connector, under-seat harness, seat reclining/slide areas and connector locking tabs for damage or disconnected plugs.
  4. With battery safely disconnected, unplug the pretensioner connector and inspect pins for corrosion, damage or pushed-out terminals. Repair or replace damaged connector.
  5. Measure resistance across the pretensioner at the connector. Compare to manufacturer spec. If resistance is infinite/OL, the pretensioner coil or wiring is open.
  6. If pretensioner is open, measure continuity from the pretensioner connector back to the SRS module connector to locate open section. Repair broken wires, chafed sections or bad crimp joints; replace wiring if necessary.
  7. If pretensioner resistance is within spec but code persists, check connector-pin-to-pin continuity and for shorts to ground/other circuits. Check related fuses and module power/ground.
  8. If wiring and connector are good but the fault remains, consider replacing the pretensioner assembly (if deployed or internally failed) or evaluate the SRS control module using dealer-level diagnostics.
  9. After repairs, reconnect everything, restore battery, clear codes with scanner and perform SRS system tests/relearn procedures per manufacturer. Verify the SRS warning lamp extinguishes and no related codes return.
  10. If intermittent faults reappear, perform wiggle/road test with live-data monitoring and re-check harness routing and strain relief at seat mounts.

Likely causes

  • Open/interrupt in the pre-tensioner wiring harness under the seat from movement or abrasion
  • Poor connector contact (corrosion, bent pin, locking tab not fully engaged)
  • Pretensioner has deployed previously or failed internally (open coil)
  • Loose/removed seat harness connector after service

Fault status

⚠️ Status
Right seat belt pre-tensioner circuit open — continuity lost to right pretensioner (inspect connectors, wiring, and pretensioner). SRS warning lamp likely illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–3.0 hours

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