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Home / DTC / B1993 — Left airbag circuit short to ground

B1993 — Left airbag circuit short to ground

Detailed page for trouble code B1993.

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B1993

LAND ROVER B — Body

Left airbag circuit short to ground

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

Causes

  • Damaged insulation or chafed wiring in the left airbag harness contacting chassis ground
  • Corroded, loose or damaged connector at the left airbag or SRS control module
  • Shorted or damaged airbag squib (left airbag)
  • Incorrect or damaged repairs/splices in the SRS wiring
  • Faulty SRS control module or internal short in module harness connector

Symptoms

  • SRS / airbag warning lamp illuminated on instrument cluster
  • Possible supplemental restraint system disabled message
  • Side/driver airbag unavailable (left-side protection lost)
  • Vehicle fails SRS self-test or inspection for airbag faults

What to check

  • Scan and record all stored SRS/DTCs and freeze frame data with a capable scan tool
  • Confirm B1993 is current (not historic) by clearing codes and rechecking
  • Visually inspect left-side airbag wiring, connectors, seat rails and harness routing for damage
  • Inspect connectors at left airbag, seat wiring plugs and SRS control module for corrosion, bent pins or intrusion
  • Measure resistance/continuity of the left squib circuit to ground (with battery safe procedure) and compare to specification

Signal parameters

  • Expected squib resistance (typical): around 1–5 ohms (manufacturer specific) — consult service manual
  • Short to ground: measured resistance close to 0 ohms between squib circuit and chassis ground
  • Open circuit: very high or infinite resistance (indicates open wire or disconnected squib)
  • SRS diagnostic pulses: low-current diagnostic signals from module (do not attempt to back-probe while live without proper equipment)
  • No battery power to SRS components while performing wiring insulation checks — follow manufacturer safety wait times after battery disconnection

Diagnostic algorithm

  1. Safety first: disable the battery and follow manufacturer's recommended SRS power-down wait time before accessing connectors or wiring.
  2. Read and record all SRS codes with a capable diagnostic tool. Note whether B1993 is current or historic and any related codes.
  3. Visually inspect the left airbag harness route (seat base, rails, B-pillar, under-dash) and connectors for physical damage, corrosion, pin damage or signs of repair.
  4. With battery disconnected and safety wait observed, disconnect the left airbag connector and measure resistance between the squib circuit pins and chassis ground. If low resistance remains with the airbag disconnected the short is in the harness between the connector and chassis or module.
  5. If the squib connector shows normal resistance to ground when disconnected, measure resistance from squib pin to squib pin to confirm squib integrity (compare to spec). A near-zero reading to ground with the airbag connected indicates a short to ground.
  6. Isolate the short by disconnecting intermediate connectors (seat plugs, floor harness plugs, door sill plugs) and repeating continuity checks to locate the section with the short.
  7. Perform wiggle tests while monitoring resistance/code status to reveal intermittent shorts caused by movement (seat travel, door opening).
  8. If harness damage is located, repair by replacing the affected harness section or using approved manufacturer repair methods (avoid simple tape splices). If no harness fault is found, suspect the squib or SRS module — verify squib resistance vs spec and consider module bench testing/inspection.
  9. After repair or replacement, reconnect, restore battery power, clear codes and perform SRS self-test. Verify no new codes and proper airbag lamp behavior.
  10. If fault persists after harness and squib checks, consult detailed manufacturer diagnostics or SRS module replacement procedure.

Likely causes

  • Wiring chafed where it passes through seat rails, seat belt retractor area or door jamb
  • Connector contamination/corrosion at airbag or module connector
  • Seat removal or previous work that pinched or cut the squib wire
  • Failed airbag squib with internal short

Fault status

⚠️ Status
SRS lamp illuminated — Left airbag circuit short to ground detected (B1993). Airbag may be disabled until fault corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1994 B1000 B1600 B0020 B1799
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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