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Home / DTC / B1A39 — right curtain 2 air bag - short circuit walk of ignition

B1A39 — right curtain 2 air bag - short circuit walk of ignition

Detailed page for trouble code B1A39.

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Code

B1A39

LAND ROVER B — Body

right curtain 2 air bag - short circuit walk of ignition

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

Causes

  • Damaged/frayed wiring in curtain airbag harness (roof rail/headliner area).
  • Corroded, bent or contaminated airbag connector terminals.
  • Short to battery positive or short to ground in squib circuit.
  • Faulty curtain airbag squib (internal short).
  • Faulty SRS control module or poor ground at module.
  • Water/moisture ingress in connector or wiring.

Symptoms

  • SRS / Airbag warning light illuminated on instrument cluster.
  • Right side curtain airbag disabled or SRS fault message displayed.
  • Possible additional related SRS codes logged. Noisy or intermittent SRS lamp during ignition cycle.

What to check

  • Read and record all SRS codes and freeze-frame data with a capable scan tool. Note when the fault is logged (ignition cycle, door open/closed).
  • Visually inspect right roof rail/headliner area, A- and B-pillar harness runs, and connectors for damage, corrosion, water ingress or broken clips.
  • Inspect connectors at the curtain airbag squib and any intermediate junctions; look for pushed-out pins or melted plastic.
  • Perform continuity/resistance checks of the squib circuit only with the vehicle SRS power isolated and following manufacturer safety procedures. Compare measured resistance to spec.
  • Check for evidence of recent interior/roof repairs that could have disturbed the harness.
  • Scan for related codes (other squibs or SRS module faults) to help isolate wiring vs. module/squib.

Signal parameters

  • Normal squib resistance: typically low (commonly around 2–5 ohms) — consult manufacturer spec.
  • Open-circuit: very high/OL. Short-to-ground: near 0 ohms to chassis ground. Short-to-battery/power: continuity to battery positive.
  • Diagnostic voltage checks when powered (use specialist SRS diagnostic tool): expected monitored voltages vary by manufacturer — unexpected high/low/unstable voltages indicate short/ground issues.

Diagnostic algorithm

  1. Read and save all SRS codes and freeze-frame data with a manufacturer-capable scan tool. Note ignition state when fault sets. 2) Follow manufacturer SRS safety procedure: isolate battery/power and wait the recommended discharge time before any connector or squib access. 3) Visually inspect right curtain airbag connectors, harness along roof/headliner, door jambs and pillar areas for damage, corrosion, water ingress or pinching. 4) With SRS power isolated, measure squib circuit resistance (module pin to squib connector). Compare to spec — a very low value suggests short to ground/power; a very high value suggests open circuit. 5) Isolate sections of harness: disconnect the curtain airbag connector and check for continuity to ground and to battery positive to identify short location. 6) If harness and connectors appear OK, swap or bench-test the squib (or use an approved airbag simulator) per manufacturer service instructions to confirm squib condition. 7) If squib and harness check OK, suspect SRS control module or poor module ground; inspect module connectors and grounds, and test/replace module only per manufacturer guidance. 8) After repairs, clear codes, perform SRS system self-tests and verify no recurrence through several ignition cycles. Document repairs and retest vehicle safety systems.
  2. Safety note: Airbag squibs are pyrotechnic. Always follow vehicle manufacturer SRS isolation, handling and repair procedures. Do not probe or apply power to squib connectors except with approved diagnostic equipment.

Likely causes

  • Wiring damage at door hinge or roof pillar where harness flexes.
  • Corroded/contaminated connector at curtain airbag or intermediate connector.
  • Short caused by pinch, staple or metal contact after headliner work.

Fault status

⚠️ Status
Right curtain 2 airbag — short circuit detected during ignition cycle. SRS control module has disabled the affected circuit. Repair required before system is fully functional.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

B1A38 B1A3A B1A3B B1801 B1423
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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