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Home / DTC / B1886 — Control circuit for the seat belt pretensioner deployment security right - low resistance

B1886 — Control circuit for the seat belt pretensioner deployment security right - low resistance

Detailed page for trouble code B1886.

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22,491specific
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Code

B1886

LAND ROVER B — Body

Control circuit for the seat belt pretensioner deployment security right - low resistance

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

Causes

  • Short to ground in the right seat belt pretensioner wiring
  • Damaged/frayed harness or chafed insulation near the seat or B-pillar
  • Corroded or poorly seated connector at the pretensioner or SRS control module
  • Internal short or failed pretensioner (squib)
  • Faulty SRS control module or incorrect module grounding
  • Aftermarket equipment or seat removal/installation damage

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • Seat belt pretensioner(s) may be disabled (no deployment when commanded)
  • Possible loss of other SRS functions or additional SRS DTCs
  • Diagnostic trouble codes present for right-side pretensioner circuit

What to check

  • Visually inspect right front seat, seat belt anchor, B-pillar and floor harness for damage, chafing or corrosion
  • Check and reseat the pretensioner and SRS module connectors; inspect pins for corrosion or damage
  • Scan SRS control module for all stored codes and freeze frame data using manufacturer-level scan tool
  • Measure wiring continuity and resistance of the pretensioner circuit with ignition off and battery isolated
  • Confirm proper battery negative disconnection and SRS capacitor discharge before touching connectors

Signal parameters

  • Typical pretensioner loop resistance (manufacturer-dependent) is low but not zero — commonly around 0.5–3.0 ohms for a healthy squib (check OEM spec)
  • A measured near‑zero ohms or very low value indicates a short to ground or internal short
  • Open or very high resistance indicates an open circuit, not low resistance
  • No voltage should be applied to squib; controller supplies firing current only during deployment

Diagnostic algorithm

  1. Safety first: Disable SRS power — disconnect negative battery terminal and wait the OEM-specified time (commonly ≥90 seconds) before any SRS connector work.
  2. Scan and record all SRS codes and freeze-frame data using a compatible diagnostic tool; clear the code and see if it returns after key cycles.
  3. Perform a careful visual inspection of the right pretensioner harness from the pretensioner to the SRS module: look for chafe, pinched wiring, broken insulation or water entry.
  4. Disconnect the pretensioner connector (with battery isolated). Measure DC resistance across the pretensioner squib terminals at the connector. Compare to OEM specification. Do not apply power to the squib.
  5. With the pretensioner connector disconnected, measure resistance from each pretensioner terminal to chassis ground to check for shorts to ground. A near-zero reading indicates a short to ground in the harness or connector.
  6. If low resistance is present at the module connector, perform back-probing or isolate sections of harness and wiggle test while monitoring resistance to locate the short.
  7. If low resistance exists only at the pretensioner and not in wiring, replace the pretensioner assembly and retest.
  8. If wiring and pretensioner check OK, inspect SRS module connector and module grounds. If low resistance persists and wiring/pretensioner are good, suspect SRS control module fault — verify with OEM diagnostic procedures.
  9. After repair, clear codes and perform SRS system self-test and confirm no recurrence of B1886.

Likely causes

  • Wire insulation abrasion causing conductor contact with chassis ground
  • Corroded pin or water ingress at the seat pretensioner connector
  • Shorted squib inside the pretensioner due to internal failure
  • Poor ground or short at SRS module connector
  • Incorrect/loose mating of connector pins after seat work

Fault status

⚠️ Status
B1886 — Low resistance detected in right seat belt pretensioner deployment/security control circuit. SRS lamp on; right pretensioner may be disabled. Possible short to ground, connector or squib fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1885 B1887 B1620 B1650
320

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

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Code

B1886

Other B — Body

Seatbelt Passenger Pretensioner Circuit Resistance Low on Squib

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

Causes

  • Short to ground in the right seat belt pretensioner wiring
  • Damaged/frayed harness or chafed insulation near the seat or B-pillar
  • Corroded or poorly seated connector at the pretensioner or SRS control module
  • Internal short or failed pretensioner (squib)
  • Faulty SRS control module or incorrect module grounding
  • Aftermarket equipment or seat removal/installation damage

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • Seat belt pretensioner(s) may be disabled (no deployment when commanded)
  • Possible loss of other SRS functions or additional SRS DTCs
  • Diagnostic trouble codes present for right-side pretensioner circuit

What to check

  • Visually inspect right front seat, seat belt anchor, B-pillar and floor harness for damage, chafing or corrosion
  • Check and reseat the pretensioner and SRS module connectors; inspect pins for corrosion or damage
  • Scan SRS control module for all stored codes and freeze frame data using manufacturer-level scan tool
  • Measure wiring continuity and resistance of the pretensioner circuit with ignition off and battery isolated
  • Confirm proper battery negative disconnection and SRS capacitor discharge before touching connectors

Signal parameters

  • Typical pretensioner loop resistance (manufacturer-dependent) is low but not zero — commonly around 0.5–3.0 ohms for a healthy squib (check OEM spec)
  • A measured near‑zero ohms or very low value indicates a short to ground or internal short
  • Open or very high resistance indicates an open circuit, not low resistance
  • No voltage should be applied to squib; controller supplies firing current only during deployment

Diagnostic algorithm

  1. Safety first: Disable SRS power — disconnect negative battery terminal and wait the OEM-specified time (commonly ≥90 seconds) before any SRS connector work.
  2. Scan and record all SRS codes and freeze-frame data using a compatible diagnostic tool; clear the code and see if it returns after key cycles.
  3. Perform a careful visual inspection of the right pretensioner harness from the pretensioner to the SRS module: look for chafe, pinched wiring, broken insulation or water entry.
  4. Disconnect the pretensioner connector (with battery isolated). Measure DC resistance across the pretensioner squib terminals at the connector. Compare to OEM specification. Do not apply power to the squib.
  5. With the pretensioner connector disconnected, measure resistance from each pretensioner terminal to chassis ground to check for shorts to ground. A near-zero reading indicates a short to ground in the harness or connector.
  6. If low resistance is present at the module connector, perform back-probing or isolate sections of harness and wiggle test while monitoring resistance to locate the short.
  7. If low resistance exists only at the pretensioner and not in wiring, replace the pretensioner assembly and retest.
  8. If wiring and pretensioner check OK, inspect SRS module connector and module grounds. If low resistance persists and wiring/pretensioner are good, suspect SRS control module fault — verify with OEM diagnostic procedures.
  9. After repair, clear codes and perform SRS system self-test and confirm no recurrence of B1886.

Likely causes

  • Wire insulation abrasion causing conductor contact with chassis ground
  • Corroded pin or water ingress at the seat pretensioner connector
  • Shorted squib inside the pretensioner due to internal failure
  • Poor ground or short at SRS module connector
  • Incorrect/loose mating of connector pins after seat work

Fault status

⚠️ Status
B1886 — Low resistance detected in right seat belt pretensioner deployment/security control circuit. SRS lamp on; right pretensioner may be disabled. Possible short to ground, connector or squib fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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