B1992

Code

LAND ROVER B — Body

Left airbag circuit short to battery

Brand: LAND ROVER

Type: B — Body

Views: UK: 7 EN: 23 RU: 10

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Page language: EN

Causes

Short to battery (positive supply) on left airbag/squib wiring
Damaged or chafed harness where conductor contacts a fused +12V source
Faulty connector or pin pushed into contact with live circuit
Failed airbag squib or pretensioner with internal short
Corrosion or conductive contamination in connector
Faulty SRS control module or shorted module driver output (less common)

Symptoms

SRS / airbag warning lamp illuminated on instrument cluster
Possible stored related SRS DTCs (left airbag circuit codes)
Right or other SRS functions may be inhibited depending on module strategy
No airbag deployment during testing (module will inhibit deployment when fault present)

What to check

Read and record all SRS-related DTCs and freeze frame data with a factory or capable SRS scan tool
Verify vehicle battery voltage and health before diagnostics
Visually inspect left-side airbag wiring, connectors, seat harness, seat belt pretensioner, and steering wheel/column routing for damage, pinching, or corrosion
Verify connector terminals are present and properly seated (no pushed-out pins)
Check for evidence of aftermarket accessories or repairs that may have altered wiring routing
Follow manufacturer SRS service procedure to disable SRS (battery disconnect / module sleep) before disconnecting or measuring circuits

Signal parameters

Expected squib circuit resistance (typical): low resistance — generally under 5 ohms for a single squib (check OEM spec before comparing)
Open-circuit: very high/OL (infinite) resistance if squib is open or circuit open
Short-to-battery symptom: near battery voltage (~12 V) present at the left squib connector pin with connector disconnected from the squib (indicates short to +12V)
Short-to-ground symptom (contrast): near 0 V present when shorted to ground
Cranking/ignition on voltage: battery voltage available on supply feed; SRS driver pins should not show constant battery voltage when circuit is intact

Diagnostic algorithm

Read all SRS codes with a manufacturer-capable scan tool and note current/written freeze frame data.
Follow the manufacturer's SRS disable procedure (disconnect battery and/or use specified wait time) before any connector removal or resistance checks.
Visually inspect connectors and wiring along the left side: under the seat, seat belt pretensioner area, door hinge grommet, and steering column if applicable.
With the squib connector disconnected (and SRS disabled), measure resistance of the left squib circuit back to the SRS module using a digital ohmmeter. Compare to OEM spec. Low resistance indicates squib or shorted harness; very high indicates open circuit.
With SRS disabled and harness accessible, check continuity between the left squib positive circuit and battery positive. Presence of continuity to battery positive indicates a short to battery on the harness or at a connected component.
With ignition ON (and SRS enabled per OEM safety instructions for live voltage checks only), carefully measure voltage at the left airbag connector pin relative to vehicle ground. A steady ~12 V at the squib pin (with the squib disconnected) indicates a short to battery/supplied +12V. Only perform live checks following OEM safety instructions.
Isolate the short by disconnecting intermediate connectors (seat modules, seat belt pretensioner connectors, bulkhead plugs) and retesting until the shorted segment is found.
Inspect and repair any damaged wiring: replace damaged sections with correct gauge, use proper SRS-rated connectors, and ensure correct routing and strain relief. Replace affected components (squib, pretensioner) only after confirming wiring is good.
If wiring and components test good but fault persists, suspect SRS control unit driver fault — consult manufacturer guidance; replacement or module bench repair may be required.
After repair, reconnect and re-enable SRS, clear codes with scan tool, and verify the lamp extinguishes and no related codes return.

Likely causes

Damaged insulation in wiring under seat, near door hinge, or in steering column (movement areas)
Connector pushed onto the wrong terminal or pin shorted to +12V accessory feed
Seat module, seat belt pretensioner or side impact airbag shorted internally
Water ingress/corrosion at the left airbag connector
Aftermarket accessory or previous repair routed near SRS wiring causing contact with +12V

Fault status

⚠️ Status

Stored when the SRS module detects a short to battery (+12V) on the left airbag/squib circuit. SRS warning lamp will be on and left-side airbag deployment may be inhibited until fault is corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-2 hours

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