Code
B1129
LAND ROVER
B — Body
Control of the deployment of the inflatable curtain on the passenger side
Views:
UK: 5
EN: 13
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or short in the passenger-side curtain squib wiring (headliner, A-pillar, door area)
- Poor, corroded or disconnected connector at the curtain squib or airbag control module
- Damaged or deployed inflatable curtain squib
- Faulty airbag control module (ACM/RCM)
- Water intrusion, mechanical damage, previous improper repairs
- Loss of supply or reference voltage to the SRS circuit, poor ground
Symptoms
- SRS / Airbag warning light illuminated or flashing on the instrument panel
- Passenger-side curtain deployment disabled (system may flag that side as not ready)
- Possible failed SRS self-test on power-up
- Vehicle may fail safety inspection due to SRS light
- No other drivability symptoms in normal operation
What to check
- Use a manufacturer-capable SRS scan tool to read all stored SRS codes and freeze-frame data
- Check SRS warning lamp behavior on ignition cycle (lamp on, blink codes if applicable)
- Visually inspect curtain wiring along the roofline, A-pillar, and door hinge areas for damage or pinched wires
- Inspect connectors at the curtain squib and airbag control module for corrosion, bent pins, or loose terminals
- Check battery voltage and ground integrity before performing electrical tests
- Review vehicle history for prior collisions or airbag repairs and any applicable TSBs/recalls
Signal parameters
- Airbag control module: passenger curtain deploy enable/disable flag (status bit)
- Squib circuit resistance (ohms) — compare measured value to factory specification
- Continuity between squib connector and airbag module
- Presence of short to battery or short to ground on the squib circuit (no-load voltage checks)
- Side impact sensor status and crash data (freeze-frame if available)
- Module supply voltage and ground integrity at time of fault
Diagnostic algorithm
- Read and record all SRS codes and freeze-frame data with a qualified airbag-capable scan tool. Note ignition cycle and voltage conditions.
- Do not deploy or attempt to fire the squib. Disconnect battery negative and follow manufacturer wait time and safety procedures before working on the SRS system.
- Visually inspect wiring and connectors along the passenger-side headliner, A-pillar, door hinge, and curtain mounting areas for damage, corrosion, or previous splice repairs.
- With battery disconnected and service manual procedures followed, check continuity and resistance of the passenger curtain squib circuit to the module; compare to manufacturer specifications. Replace/repair wiring if open or out-of-spec.
- Check for shorts to battery or ground on the squib circuit using appropriate methods specified by the manufacturer (do not apply external voltage to a squib).
- Inspect and reseat airbag module connector(s); inspect pins for corrosion, deformation or pushed-out pins. Repair as required.
- If wiring and connectors are good, consider replacing the curtain squib only if resistance indicates a failed squib or if squib was previously deployed. Follow strict manufacturer replacement and disposal procedures for pyrotechnic components.
- If circuit and squib are good, evaluate airbag control module operation and communication; consider module replacement or reprogramming only after confirming upstream wiring and sensors.
- After repairs, clear codes, perform full SRS system self-test with scan tool, and verify that the SRS warning lamp extinguishes and no codes return. Road test as required and re-check system status.
- Document repairs and ensure compliance with safety procedures and legal requirements for airbag component replacement.
Likely causes
- Damaged wiring or chafed harness at the A-pillar/headliner where the curtain harness routes
- Corroded/loose connector at the curtain squib or module
- Curtain squib resistance out-of-spec (open or short)
- After-crash condition / deployed squib not replaced or improperly replaced
Fault status
Status
Passenger-side inflatable curtain deployment control fault detected. SRS warning lamp on; passenger curtain deployment may be disabled until repaired.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
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Workshop ManualYour experience will help others
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