Code
B0072
Generic
B — Body
Passenger Seat Belt Pretensioner A Deployment Control
Views:
UK: 13
EN: 22
RU: 21
AI status
Completed
Completed
100%
Causes
- Open or short in the pretensioner (squib) wiring harness
- Corroded or loose connector at the pretensioner or SRS module
- Failed or previously-deployed passenger pretensioner (squib)
- Faulty SRS/airbag control module or internal driver circuitry
- Poor ground or battery supply to SRS system
- Damage to wiring from seat movement, collision, or service work
Symptoms
- SRS/airbag warning lamp illuminated on instrument panel
- Seat belt pretensioner will not deploy when commanded
- Diagnostic trouble code B0072 stored in airbag control unit
- Possible disabled passenger airbag or restraint functions
- Vehicle may fail safety inspections while the SRS lamp is on
What to check
- Retrieve SRS fault codes and freeze-frame data with a compatible scan tool
- Follow manufacturer safety procedure: disable the battery negative terminal and wait the specified time before handling SRS components
- Visually inspect passenger seat area: connectors, harness routing, signs of collision damage or repairs
- Inspect connector pins for corrosion, bent pins, or poor mating
- With battery disconnected, measure squib resistance at the pretensioner connector and at the SRS module harness connector
- Check continuity between pretensioner connector and SRS module; verify no short to ground or battery positive
Signal parameters
- Typical squib resistance (passenger pretensioner): approx. 0.5–3.0 ohms (manufacturer-specific — confirm with vehicle data)
- Open circuit: infinite resistance (OL) → indicates wiring open or disconnected
- Short to ground/power: near 0 ohms → indicates shorted wiring or internal squib short
- Deployment pulse: high-current firing pulse (milliseconds) — do not attempt to recreate or measure live firing pulse except with proper diagnostic equipment
- Note: exact resistance and pulse values vary by manufacturer; always confirm with OEM spec before judging a component
Diagnostic algorithm
- Read and record all SRS codes and freeze-frame data with a qualified scan tool
- Confirm B0072 is current and note any related codes (airbag module, occupancy sensor, other pretensioners)
- Follow safety procedure: disconnect battery negative and wait the manufacturer-specified time before touching SRS components
- Visually inspect passenger pretensioner connector, seat harness, and routing for damage, corrosion, or loose pins
- With battery disconnected and connector unplugged, measure resistance across pretensioner terminals at the connector. Compare to manufacturer spec. If infinite or open, suspect open circuit or connector; if very low (near 0), suspect short or deployed squib
- If resistance at pretensioner is within spec, measure resistance/continuity from SRS module connector to pretensioner connector to locate wiring fault
- Repair or replace damaged wiring or connector as required. If squib resistance indicates deployment or internal short, replace the pretensioner assembly.
- If wiring and pretensioner check good, inspect SRS module connectors and grounds. If module output driver is suspected, consult OEM diagnostics—module replacement or repair may be required.
- After repairs, clear codes and perform SRS system self-test with scan tool. Verify no new codes and that SRS lamp extinguishes.
- If any step requires replacement of SRS components, follow OEM procedures for component replacement, crash-data handling, and post-repair system initialization or calibration
Likely causes
- Damaged/shorted squib wiring between pretensioner and SRS module
- Disconnected or corrosion-damaged connector at the passenger pretensioner
- Pretensioner already deployed and not replaced
- Faulty SRS control module output for Passenger Pretensioner A
Fault status
Status
SRS warning: Passenger Seat Belt Pretensioner A deployment control circuit fault detected (open/short/out-of-range or deployed pretensioner).
Repair difficulty: Hard
Diagnostic time: 1.5-3.0 hours
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Code
B0072
LAND ROVER
B — Body
of passengers
Views:
UK: 5
EN: 13
RU: 7
AI status
Completed
Completed
100%
Causes
- Open or short in the pretensioner (squib) wiring harness
- Corroded or loose connector at the pretensioner or SRS module
- Failed or previously-deployed passenger pretensioner (squib)
- Faulty SRS/airbag control module or internal driver circuitry
- Poor ground or battery supply to SRS system
- Damage to wiring from seat movement, collision, or service work
Symptoms
- SRS/airbag warning lamp illuminated on instrument panel
- Seat belt pretensioner will not deploy when commanded
- Diagnostic trouble code B0072 stored in airbag control unit
- Possible disabled passenger airbag or restraint functions
- Vehicle may fail safety inspections while the SRS lamp is on
What to check
- Retrieve SRS fault codes and freeze-frame data with a compatible scan tool
- Follow manufacturer safety procedure: disable the battery negative terminal and wait the specified time before handling SRS components
- Visually inspect passenger seat area: connectors, harness routing, signs of collision damage or repairs
- Inspect connector pins for corrosion, bent pins, or poor mating
- With battery disconnected, measure squib resistance at the pretensioner connector and at the SRS module harness connector
- Check continuity between pretensioner connector and SRS module; verify no short to ground or battery positive
Signal parameters
- Typical squib resistance (passenger pretensioner): approx. 0.5–3.0 ohms (manufacturer-specific — confirm with vehicle data)
- Open circuit: infinite resistance (OL) → indicates wiring open or disconnected
- Short to ground/power: near 0 ohms → indicates shorted wiring or internal squib short
- Deployment pulse: high-current firing pulse (milliseconds) — do not attempt to recreate or measure live firing pulse except with proper diagnostic equipment
- Note: exact resistance and pulse values vary by manufacturer; always confirm with OEM spec before judging a component
Diagnostic algorithm
- Read and record all SRS codes and freeze-frame data with a qualified scan tool
- Confirm B0072 is current and note any related codes (airbag module, occupancy sensor, other pretensioners)
- Follow safety procedure: disconnect battery negative and wait the manufacturer-specified time before touching SRS components
- Visually inspect passenger pretensioner connector, seat harness, and routing for damage, corrosion, or loose pins
- With battery disconnected and connector unplugged, measure resistance across pretensioner terminals at the connector. Compare to manufacturer spec. If infinite or open, suspect open circuit or connector; if very low (near 0), suspect short or deployed squib
- If resistance at pretensioner is within spec, measure resistance/continuity from SRS module connector to pretensioner connector to locate wiring fault
- Repair or replace damaged wiring or connector as required. If squib resistance indicates deployment or internal short, replace the pretensioner assembly.
- If wiring and pretensioner check good, inspect SRS module connectors and grounds. If module output driver is suspected, consult OEM diagnostics—module replacement or repair may be required.
- After repairs, clear codes and perform SRS system self-test with scan tool. Verify no new codes and that SRS lamp extinguishes.
- If any step requires replacement of SRS components, follow OEM procedures for component replacement, crash-data handling, and post-repair system initialization or calibration
Likely causes
- Damaged/shorted squib wiring between pretensioner and SRS module
- Disconnected or corrosion-damaged connector at the passenger pretensioner
- Pretensioner already deployed and not replaced
- Faulty SRS control module output for Passenger Pretensioner A
Fault status
Status
SRS warning: Passenger Seat Belt Pretensioner A deployment control circuit fault detected (open/short/out-of-range or deployed pretensioner).
Repair difficulty: Hard
Diagnostic time: 1.5-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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👎 Dislike
0
Send to email