Code
B144D
Generic
B — Body
Front passenger airbag deployment circuit short to ground
Views:
UK: 0
EN: 1
RU: 0
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting chassis ground
- Damaged passenger airbag module (squib) with internal short
- Corroded or loose connector pins at airbag or control module
- Water ingress or contamination in connectors or harness
- Incorrect aftermarket electrical work or accessory wiring tapping into airbag circuit
- Faulty airbag control module or internal failure
Symptoms
- SRS/Airbag warning lamp illuminated or flashing
- Possible disablement of passenger airbag(s) (passenger airbag off message or lamp)
- No crash deployment verification for front passenger airbag
- Other SRS-related faults may be present in scan tool data
What to check
- Read and record all SRS codes and freeze-frame data with a capable scan tool
- Confirm battery voltage is stable (low battery can cause spurious faults)
- Check vehicle-specific SRS power-down time and disconnect battery negative before working on SRS
- Visually inspect passenger airbag connector, harness routing, and nearby panels for damage or signs of repair
- Check for moisture, corrosion, or pin deformation at connectors
- Inspect seat occupancy / weight sensor wiring (if present) for related faults
Signal parameters
- Typical squib continuity (varies by vehicle): ~0.5–5 Ω across squib terminals (consult vehicle spec)
- Continuity between each squib wire and chassis ground: should be open (no continuity)
- Insulation resistance to chassis: typically >1 MΩ (manufacturer dependent)
- No sustained battery voltage should be present across squib when SRS is disabled; consult vehicle-specific power states before measuring live voltages
Diagnostic algorithm
- Use a diagnostic scan tool to confirm B144D and check for additional SRS codes and freeze-frame data
- Follow manufacturer SRS safety procedure: disable SRS power (disconnect battery negative) and wait the specified capacitor discharge time before touching connectors (typically several minutes; use OEM procedure)
- Perform a careful visual inspection of the passenger airbag connector, wiring harness, and routing for abrasion, pin damage, corrosion, or foreign objects that could contact chassis ground
- Disconnect the passenger airbag module connector. With battery still disconnected, measure resistance across the airbag module squib terminals. Compare to vehicle specification; a very low resistance to chassis indicates internal short.
- Measure resistance between each squib wire and chassis ground (with module disconnected). Continuity to ground confirms a short in the harness or connector area.
- If short to ground is present in harness, isolate by unplugging intermediate connectors or removing panels progressively and re-testing to localize the fault
- Inspect and repair damaged wiring: remove chafe points, repair with correct splices, or replace harness sections. Replace corroded connectors or pins as needed.
- If wiring and connectors check good but squib resistance is out of spec, replace the passenger airbag module per manufacturer service procedures
- If no wiring or airbag faults are found, inspect/replace the airbag control module or its connector as a last step and re-test
- After repairs, clear codes and perform SRS system self-test and any required post-repair validations or seat-occupant system calibrations
Likely causes
- Pinched/chafed wire in dash harness near passenger airbag connector
- Passenger airbag connector contaminated or corroded, creating a ground path
- Shorted/failed passenger airbag squib element
- Repair or aftermarket accessory accidentally grounded to the circuit
Fault status
Status
B144D — Front passenger airbag deployment circuit short to ground. Low-resistance path to chassis detected on passenger squib circuit; SRS warning lamp set.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B144D
LAND ROVER
B — Body
All - Control circuit relay
Views:
UK: 7
EN: 12
RU: 5
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting chassis ground
- Damaged passenger airbag module (squib) with internal short
- Corroded or loose connector pins at airbag or control module
- Water ingress or contamination in connectors or harness
- Incorrect aftermarket electrical work or accessory wiring tapping into airbag circuit
- Faulty airbag control module or internal failure
Symptoms
- SRS/Airbag warning lamp illuminated or flashing
- Possible disablement of passenger airbag(s) (passenger airbag off message or lamp)
- No crash deployment verification for front passenger airbag
- Other SRS-related faults may be present in scan tool data
What to check
- Read and record all SRS codes and freeze-frame data with a capable scan tool
- Confirm battery voltage is stable (low battery can cause spurious faults)
- Check vehicle-specific SRS power-down time and disconnect battery negative before working on SRS
- Visually inspect passenger airbag connector, harness routing, and nearby panels for damage or signs of repair
- Check for moisture, corrosion, or pin deformation at connectors
- Inspect seat occupancy / weight sensor wiring (if present) for related faults
Signal parameters
- Typical squib continuity (varies by vehicle): ~0.5–5 Ω across squib terminals (consult vehicle spec)
- Continuity between each squib wire and chassis ground: should be open (no continuity)
- Insulation resistance to chassis: typically >1 MΩ (manufacturer dependent)
- No sustained battery voltage should be present across squib when SRS is disabled; consult vehicle-specific power states before measuring live voltages
Diagnostic algorithm
- Use a diagnostic scan tool to confirm B144D and check for additional SRS codes and freeze-frame data
- Follow manufacturer SRS safety procedure: disable SRS power (disconnect battery negative) and wait the specified capacitor discharge time before touching connectors (typically several minutes; use OEM procedure)
- Perform a careful visual inspection of the passenger airbag connector, wiring harness, and routing for abrasion, pin damage, corrosion, or foreign objects that could contact chassis ground
- Disconnect the passenger airbag module connector. With battery still disconnected, measure resistance across the airbag module squib terminals. Compare to vehicle specification; a very low resistance to chassis indicates internal short.
- Measure resistance between each squib wire and chassis ground (with module disconnected). Continuity to ground confirms a short in the harness or connector area.
- If short to ground is present in harness, isolate by unplugging intermediate connectors or removing panels progressively and re-testing to localize the fault
- Inspect and repair damaged wiring: remove chafe points, repair with correct splices, or replace harness sections. Replace corroded connectors or pins as needed.
- If wiring and connectors check good but squib resistance is out of spec, replace the passenger airbag module per manufacturer service procedures
- If no wiring or airbag faults are found, inspect/replace the airbag control module or its connector as a last step and re-test
- After repairs, clear codes and perform SRS system self-test and any required post-repair validations or seat-occupant system calibrations
Likely causes
- Pinched/chafed wire in dash harness near passenger airbag connector
- Passenger airbag connector contaminated or corroded, creating a ground path
- Shorted/failed passenger airbag squib element
- Repair or aftermarket accessory accidentally grounded to the circuit
Fault status
Status
B144D — Front passenger airbag deployment circuit short to ground. Low-resistance path to chassis detected on passenger squib circuit; SRS warning lamp set.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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