Code
B2641
LAND ROVER
B — Body
Airbag development indication circuit - short to the battery
Views:
UK: 8
EN: 10
RU: 8
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting vehicle battery or other constant +12V source
- Corroded or water-intruded connector producing a battery feed to the circuit
- Incorrect or damaged replacement component wired to battery (aftermarket equipment or poor repair)
- Short inside an airbag module, seatbelt pretensioner, or SRS control module
- Faulty connector terminal or pin pushed into contact with +12V circuit
Symptoms
- SRS/Airbag warning lamp illuminated or flashing continuously
- Possible disablement of one or more airbags and pretensioners
- Fault codes stored in Airbag/SRS control module (no deployment until repaired)
- Vehicle may fail safety inspection or display additional body electronics faults
What to check
- Record freeze frame and all stored SRS codes using a manufacturer-level scan tool
- Perform a visual inspection of airbag wiring harnesses, connectors and modules (under seats, B‑pillars, steering column, dashboard)
- Check for obvious signs of damage: pinched wires, chafing, melted insulation, corrosion, water ingress or aftermarket splices
- With OEM safety procedure followed (battery disconnected and SRS capacitors allowed to discharge), disconnect airbag module/pretensioner connectors and inspect pins for corrosion or shorted contacts
- Measure voltage at the suspect connector with respect to ground (see safety notes) to confirm presence of battery +12V when it should be absent
- Compare resistance of each squib/pretensioner to manufacturer specification after isolating from harness
Signal parameters
- Expected: airbag squib/pretensioner circuit shows low single‑digit ohms when isolated (typical squib resistance is a few ohms) — values vary by vehicle; consult Service Manual
- Fault indication: near 0 Ω or a direct presence of battery +12V at the airbag connector with ignition OFF indicates a short to battery
- Normal: no battery voltage at squib connector with ignition OFF and battery disconnected per safety procedure
- SRS module communications: scan tool should show B2641 with related SRS parameters and possibly voltage or resistance readings if supported
Diagnostic algorithm
- Safety first: follow Land Rover SRS safety procedures. Disconnect negative battery terminal and wait the manufacturer‑specified time before working on SRS circuits (do not rely on arbitrary short waits). Use a qualified technician for airbag work.
- Read and record all SRS codes and freeze frame data with a diagnostic scan tool. Note which circuit(s) are reported.
- Visually inspect wiring and connectors for damage, corrosion or aftermarket splices in areas commonly routed (under seats, B‑pillar, dash, steering column).
- With the battery reconnected only when safe and directed by the Service Manual, measure voltage at the indicated airbag connector with ignition OFF (or per Service Manual). Presence of +12V indicates a short to battery. If unsafe to measure with battery connected, isolate harness and measure resistance instead.
- Isolate the fault by disconnecting modules one at a time (driver airbag, passenger airbag, seat belt pretensioners, side impact sensors) and check whether the short disappears. This identifies whether the short is in a module or harness segment.
- If the short remains with all modules disconnected, inspect splice points, body harness connectors, and any accessory circuits for a misrouted +12V feed. Repair damaged wiring or replace corroded connectors. If the short disappears when a specific module is disconnected, suspect that module or its internal wiring.
- After repair, clear codes and perform SRS system scans and built‑in self tests (and vehicle-specific calibration or diagnostics) to confirm the fault is gone. If module replacement was necessary, follow programming/repair procedures required by Land Rover.
- If an internal short in the SRS control unit is suspected, remove and bench test/carry out module replacement only per factory instructions (module replacement and disposal must follow safety and legal requirements).
Likely causes
- Harness abrasion at common routing points (under seat, B‑pillar, steering column)
- Connector contamination/corrosion allowing conductive path to battery positive
- Clock spring damage (driver airbag) allowing unintended connection to +12V
- Previous repair/aftermarket device incorrectly connected to airbag circuit
- Internal short in SRS module or a squib/pretensioner failed shorted to battery
Fault status
Status
Airbag development/indication circuit has a short to battery (+12V present where not expected). SRS lamp will be illuminated; airbags/pretensioners may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.0-3.5 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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