B1879

Code

LAND ROVER B — Body

Left seat belt pre-tensioner - ground short circuit

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 33 RU: 17

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Page language: EN

Causes

Damaged/chafed wiring harness (seat rail, B-pillar, or under-seat routing) contacting chassis ground
Corroded or contaminated pretensioner connector or module connector
Water/moisture intrusion in seat wiring or connector
Internal short within the pretensioner squib (pyrotechnic element)
Poor or damaged ground at SRS/airbag control module or seat module
Faulty airbag/seat-belt control module or internal driver electronics

Symptoms

SRS/Airbag warning lamp illuminated on instrument cluster
Possible supplemental restraint system disabled (other airbag/pretensioner functions inhibited)
Stored B1879 fault in diagnostic memory
Seat belt pre-tensioner will not operate in an event (may be masked by SRS disable)
Occasional or permanent fault lamp; fault may reappear after clearing if root cause remains

What to check

Confirm DTC B1879 and note freeze-frame/related SRS codes using a compatible scanner
Visually inspect left seat area, connectors, and wiring harness along seat rails and B-pillar for damage, corrosion, or contamination
Inspect the pretensioner connector beneath the seat for water, corrosion, bent pins, or pushed-out terminals
Record whether the vehicle has aftermarket seats or recent interior work
Follow manufacturer battery disconnect procedure and wait the required time before doing resistance checks (commonly ~90 seconds but follow service manual)
With battery isolated, measure resistance between the two pretensioner terminals (squib) and compare to specification

Signal parameters

Typical pyrotechnic pretensioner (squib) DC resistance: approximately 0.5–3 Ω (manufacturer-specific)
Expected reading between each pretensioner terminal and chassis ground: open/high (no direct low-resistance path)
If either pretensioner terminal shows low resistance (
After disconnecting battery and waiting, use a low-impedance ohmmeter to measure resistance; do NOT apply battery voltage to the squib circuit

Diagnostic algorithm

Retrieve and record all SRS/Airbag DTCs and freeze-frame data with a capable diagnostic tool.
Visually inspect left seat, seat belt pretensioner connector, seat rails, B-pillar harness, and any grommet/pass-throughs for damage, corrosion or water ingress.
Confirm correct repair procedure and disable vehicle battery per manufacturer instructions; wait required time for SRS capacitors to discharge.
Disconnect the left pretensioner connector at the seat. Measure DC resistance across the pretensioner terminals (compare to spec).
With the pretensioner disconnected, measure resistance from each pretensioner wire to chassis ground. A low resistance indicates a short to ground in the harness or connector.
If a short to ground is present, isolate by disconnecting sections of harness (seat connector, in-vehicle splice points, module connector) and re-measure to locate the short.
Inspect and repair any damaged wiring, restore corroded connectors or replace the pretensioner connector as needed. Replace the pretensioner squib if internal short is confirmed or if it has been deployed.
If harness and pretensioner check OK, inspect/replace or test the airbag/seat-belt control module and verify module ground integrity.
After repairs, clear codes, reconnect battery per procedure, and confirm fault does not return. Document test results and advise replacement of any deployed components.
Safety note: Always follow manufacturer SRS safety procedures. Do not probe or apply power to airbag squib circuits except as specified by the manufacturer.

Likely causes

Wiring chafed at seat rail or under-seat where harness flexes
Corroded/contaminated pretensioner connector under the seat
Internal short in the pretensioner squib due to moisture or age
Harness pin pushed out/misaligned at the airbag module connector

Fault status

⚠️ Status

Left seat belt pre-tensioner circuit — short to ground detected (pre-tensioner squib circuit has unintended low-resistance path to chassis).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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