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Home / DTC / B1A31 — Control of the deployment of the right side airbag - short circuit in ignition circuit

B1A31 — Control of the deployment of the right side airbag - short circuit in ignition circuit

Detailed page for trouble code B1A31.

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Code

B1A31

LAND ROVER B — Body

Control of the deployment of the right side airbag - short circuit in ignition circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 4 EN: 11 RU: 4
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Page language: EN

Causes

  • Damaged or chafed wiring in the right-side airbag squib or ignition feed circuit
  • Corroded, loose or damaged connector(s) at the airbag, seat harness, or SRS control module
  • Short to battery voltage (ignition feed) on the squib or associated wiring
  • Faulty right-side airbag squib (internal short)
  • Faulty SRS control module or internal driver electronics
  • Poor ground or battery/fuse related fault feeding the ignition circuit

Symptoms

  • Airbag / SRS warning lamp illuminated on instrument cluster
  • Right-side airbag deployed flag or disabled indication in scan tool
  • Possible additional SRS-related DTCs present
  • Vehicle may fail safety inspection related to SRS faults

What to check

  • Read and record all SRS codes and freeze frame data with an appropriate diagnostic scanner.
  • Check battery voltage and main fuses; ensure vehicle battery is charged and terminals are clean.
  • Inspect wiring and connectors for visible damage, corrosion, or pin deformation at the right-side airbag, seat harness, and SRS control module.
  • Verify ignition feed circuit fuses and relays for the SRS/airbag system.
  • With battery disconnected and SRS system disabled per manufacturer procedure, measure resistance of the right-side squib using wiring diagrams to locate connectors.
  • Check for voltage on the ignition feed circuit (with ignition ON) at the SRS module power feed and supply wires (follow safety precautions).

Signal parameters

  • Typical airbag squib resistance (approximate): commonly around 1–5 ohms (manufacturer-specific).
  • Open circuit: very high resistance or 'OL' when measured (indicates open or disconnected squib).
  • Short to ignition/battery: near 0 ohms or presence of battery voltage on the squib circuit when it should be isolated.
  • Module fault flags/bit status available via scan tool (see SRS module live data for deployment control circuit status).
  • Note: exact resistance/voltage specs vary by model — always confirm with Land Rover factory data.

Diagnostic algorithm

  1. Safety first: consult factory service information for airbag service procedures. Disable SRS power before touching connectors (disconnect battery and observe recommended wait time).
  2. Use a diagnostic scan tool to read and record all SRS codes and module live data. Note any additional related codes.
  3. Clear codes, then cycle ignition and re-scan to confirm B1A31 returns.
  4. Visually inspect right-side airbag connector(s), seat harness, door jamb/hinge area, and routing for chafing, pin damage, or corrosion.
  5. Check SRS-related fuses and ignition feed circuits for proper voltage and continuity (with caution).
  6. With battery disconnected and SRS disabled per procedure, disconnect the right-side airbag connector and measure squib resistance across the squib terminals; compare to manufacturer spec. An abnormally low resistance suggests a shorting squib; open/OL suggests open circuit.
  7. Isolate the fault by testing continuity and resistance from the SRS control module connector to the squib connector. Look for shorts to battery or ground and for intermittent shorts by gently manipulating harness while monitoring.
  8. If wiring and connectors test good, consider replacing the right-side squib (airbag) and retesting. Follow all removal/installation and disposal regulations for airbags.
  9. If fault persists after replacing squib and repairing wiring, evaluate SRS control module operation or have module bench-tested/replaced per factory guidance.
  10. After repairs, clear codes and perform full SRS system scan and self-tests to verify the fault is resolved and the airbag lamp is no longer illuminated.

Likely causes

  • Wiring damage at body/seat/door harness near seat tracks or door hinge (most common)
  • Connector corrosion/poor connection at right-side airbag connector or module
  • Shorted squib (airbag inflator wiring) on the right-side airbag
  • Faulty SRS control module (less common)

Fault status

⚠️ Status
B1A31 — Control of deployment of right side airbag: short circuit detected in ignition feed (power) circuit. SRS warning lamp illuminated; right-side airbag deployment control disabled until fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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