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Home / DTC / B1A33 — Left curtain airbag deployment control - short circuit to ignition circuit curtain

B1A33 — Left curtain airbag deployment control - short circuit to ignition circuit curtain

Detailed page for trouble code B1A33.

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Code

B1A33

LAND ROVER B — Body

Left curtain airbag deployment control - short circuit to ignition circuit curtain

Brand: LAND ROVER
Type: B — Body
Views: UK: 1 EN: 9 RU: 3
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Page language: EN

Causes

  • Damaged/frayed wiring harness to left curtain airbag (pinched, chafed, melted)
  • Faulty or corroded connector at curtain airbag or intermediate splice
  • Shorted pin in connector to ignition feed (switched battery circuit contacting squib circuit)
  • Aftermarket accessory or recent repair introduced incorrect connection to ignition feed
  • Faulty airbag squib with internal short
  • Faulty airbag control module (ACU) or internal driver circuit

Symptoms

  • SRS / airbag warning lamp ON
  • Left curtain airbag circuit fault stored (deployment inhibited until fixed)
  • Possible disablement of related restraint functions
  • No deploy during testing (fault prevents normal deployment if needed)

What to check

  • Read and record all SRS codes and freeze-frame data with a suitable scan tool
  • Confirm ignition key position and battery voltage during scan tool checks
  • Visually inspect connectors and wiring along the left roofline, A-/B-pillar and door hinge area for damage, corrosion, or aftermarket splices
  • Check for recent interior or electrical repairs that may have disturbed the headliner harness
  • Measure voltage at the airbag connector with key ON/OFF (observe SRS safety procedures)
  • Measure squib resistance (only by trained personnel, after SRS disabled) and compare to specification

Signal parameters

  • Ignition feed at SRS harness (with key ON): ≈ 12 V (nominal battery voltage)
  • Ignition feed with key OFF: 0 V (or negligible)
  • Squib resistance (typical curtain squib): ~1–5 Ω (manufacturer-specific; consult service manual)
  • Open circuit: OL or very high resistance (indicates open squib/wiring)
  • Short to battery/ignition: measured voltage present on squib circuit when it should be 0 V or squib circuit resistance abnormally low (

Diagnostic algorithm

  1. Read and document fault codes and freeze-frame with a compatible SRS scan tool.
  2. Follow manufacturer SRS safety procedures: disable SRS (battery disconnect and prescribed wait time) before touching airbag connectors or wiring. Use ESD precautions and qualified personnel.
  3. Visually inspect left curtain airbag connector, headliner harness, A-/B-pillar, door hinge area and any harness routing for damage, pin damage, corrosion or signs of heat/short.
  4. Reconnect battery per procedure and, with scan tool monitoring, verify presence/absence of ignition feed at the SRS module and at the left curtain airbag connector in the correct ignition positions. Note any unexpected constant feed.
  5. With SRS disabled again and per service manual, measure squib resistance at the airbag connector. Compare to specification. If resistance is very low or near 0 Ω suspect short; if open/OL suspect open circuit or disconnected squib.
  6. If a short to ignition is indicated, trace wiring for contact with ignition feed circuits. Inspect seams where body harnesses pass through bulkheads, door hinge areas and roof seams. Repair damaged insulation and re-route harness as required.
  7. Repair or replace damaged connectors, terminals, or sections of wiring with proper SRS-rated components and solder/crimp techniques per manufacturer guidelines.
  8. If wiring and connectors test good, consider replacing the left curtain airbag squib assembly if its internal short is suspected. Replace airbag only with correct OEM part and follow all safety procedures.
  9. If wiring and airbag are known good but fault persists, test or replace the airbag control module (ACU) as a last resort after confirming no wiring short.
  10. After repairs, clear codes, perform SRS system self-tests and verify code does not return. Perform any required calibrations or system initializations per service manual.

Likely causes

  • Chafed/shorted wire in headliner or A-/B-pillar harness contacting ignition feed
  • Loose/corroded connector at curtain airbag or wiring junction
  • Incorrect reconnection after previous repair (ignition feed tied into SRS harness)
  • Defective left curtain squib

Fault status

⚠️ Status
Stored — Short to ignition detected on left curtain airbag deployment control circuit. SRS lamp illuminated; curtain squib circuit flagged.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2.0-4.0 hours

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