Code
B0070
Generic
B — Body
Driver Seat Belt Pretensioner A Deployment Control
Views:
UK: 13
EN: 39
RU: 33
AI status
Completed
Completed
100%
Causes
- Open or shorted pretensioner wiring
- Corroded, loose or damaged pretensioner connector
- Seat belt pretensioner has deployed (pyrotechnic device used)
- Faulty pretensioner (squib) internal failure
- Faulty airbag/SRS control module or driver output stage
- Poor ground or battery supply to SRS module
Symptoms
- SRS / airbag warning lamp illuminated or flashing
- Stored/or active B0070 DTC in SRS control module
- Seat belt pretensioner not available (after deployment) or disabled
- Multiple SRS-related codes may be present
- Possible inability to clear the SRS warning until fault is repaired
What to check
- Read and record all SRS codes and freeze-frame data with an airbag-capable scan tool.
- Check vehicle history for prior deployment or repair work to SRS components.
- Visually inspect pretensioner connector and wiring along the seat harness and under the seat.
- Ensure battery is disconnected and wait the manufacturer-specified time before touching SRS circuits.
- Measure continuity/resistance of the pretensioner squib with battery disconnected.
- Check for shorts to ground or battery in the squib circuit between the pretensioner and the airbag module.
Signal parameters
- Pretensioner squib resistance typically very low — commonly about 0.5–3 ohms (manufacturer-specific).
- Open-circuit/infinite resistance indicates an open or deployed pretensioner.
- Measured short to chassis ground or battery indicates wiring short; resistance near 0 ohms requires tracing.
- No significant voltage should be present at the squib while the system is at rest; do not apply power to squib.
Diagnostic algorithm
- Use a diagnostic tool that supports SRS systems to read all related codes and note freeze-frame and history (confirm if pretensioner was deployed).
- Verify vehicle fitment and any service history showing airbag/pretensioner replacement or crash repairs.
- Follow safety precautions: disable SRS power (disconnect battery negative) and wait the manufacturer-recommended time before working on the system.
- Perform visual inspection of the pretensioner connector, terminals and wiring along the seat harness and at seat anchor points; look for chafing, pinches, corrosion and disconnected pins.
- With battery disconnected, measure resistance across the pretensioner squib connector using a low-impedance ohmmeter. Compare to manufacturer spec (typical 0.5–3 ohms).
- If resistance is open/infinite, trace continuity back toward the SRS module to find open wiring or connectors; repair damaged wires and connectors.
- If resistance is near zero or shows short to chassis/battery, isolate section by section to locate short and repair insulation or connector faults.
- If pretensioner resistance is within spec but code remains, verify wiring integrity at SRS module pins and check module output drivers or internal faults with a qualified SRS scanner or oscilloscope per manufacturer procedure.
- Replace the pretensioner if it has deployed or fails resistance tests. After replacement, follow manufacturer's requirements for connector orientation, torque, and single-use component handling.
- If SRS module is suspected faulty after harness and pretensioner check, follow manufacturer diagnostic flow for module testing/replacement and coding. Do not replace SRS module without confirming wiring and load.
- Clear codes, reconnect battery, and perform SRS system self-check and any required post-repair calibration or coding. Confirm that the SRS warning lamp extinguishes and no related codes return.
Likely causes
- Damaged wiring in the seat harness (pinched at seat rail or side bolster)
- Corroded or pushed-out contact at pretensioner connector
- Pretensioner element is open (deployed) or has very low/high resistance
- Airbag ECU output driver failed and cannot command deployment
- Related SRS sensor or communication fault causing control circuit to be disabled
Fault status
Status
Driver Seat Belt Pretensioner A deployment control fault — circuit open/short or pretensioner deployed. SRS system may be disabled; repair required before restoring full occupant protection.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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Code
B0070
HUMMER
B — Body
Roof Rail Module-Right Deployment Loop Circuit
Views:
UK: 6
EN: 23
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or shorted pretensioner wiring
- Corroded, loose or damaged pretensioner connector
- Seat belt pretensioner has deployed (pyrotechnic device used)
- Faulty pretensioner (squib) internal failure
- Faulty airbag/SRS control module or driver output stage
- Poor ground or battery supply to SRS module
Symptoms
- SRS / airbag warning lamp illuminated or flashing
- Stored/or active B0070 DTC in SRS control module
- Seat belt pretensioner not available (after deployment) or disabled
- Multiple SRS-related codes may be present
- Possible inability to clear the SRS warning until fault is repaired
What to check
- Read and record all SRS codes and freeze-frame data with an airbag-capable scan tool.
- Check vehicle history for prior deployment or repair work to SRS components.
- Visually inspect pretensioner connector and wiring along the seat harness and under the seat.
- Ensure battery is disconnected and wait the manufacturer-specified time before touching SRS circuits.
- Measure continuity/resistance of the pretensioner squib with battery disconnected.
- Check for shorts to ground or battery in the squib circuit between the pretensioner and the airbag module.
Signal parameters
- Pretensioner squib resistance typically very low — commonly about 0.5–3 ohms (manufacturer-specific).
- Open-circuit/infinite resistance indicates an open or deployed pretensioner.
- Measured short to chassis ground or battery indicates wiring short; resistance near 0 ohms requires tracing.
- No significant voltage should be present at the squib while the system is at rest; do not apply power to squib.
Diagnostic algorithm
- Use a diagnostic tool that supports SRS systems to read all related codes and note freeze-frame and history (confirm if pretensioner was deployed).
- Verify vehicle fitment and any service history showing airbag/pretensioner replacement or crash repairs.
- Follow safety precautions: disable SRS power (disconnect battery negative) and wait the manufacturer-recommended time before working on the system.
- Perform visual inspection of the pretensioner connector, terminals and wiring along the seat harness and at seat anchor points; look for chafing, pinches, corrosion and disconnected pins.
- With battery disconnected, measure resistance across the pretensioner squib connector using a low-impedance ohmmeter. Compare to manufacturer spec (typical 0.5–3 ohms).
- If resistance is open/infinite, trace continuity back toward the SRS module to find open wiring or connectors; repair damaged wires and connectors.
- If resistance is near zero or shows short to chassis/battery, isolate section by section to locate short and repair insulation or connector faults.
- If pretensioner resistance is within spec but code remains, verify wiring integrity at SRS module pins and check module output drivers or internal faults with a qualified SRS scanner or oscilloscope per manufacturer procedure.
- Replace the pretensioner if it has deployed or fails resistance tests. After replacement, follow manufacturer's requirements for connector orientation, torque, and single-use component handling.
- If SRS module is suspected faulty after harness and pretensioner check, follow manufacturer diagnostic flow for module testing/replacement and coding. Do not replace SRS module without confirming wiring and load.
- Clear codes, reconnect battery, and perform SRS system self-check and any required post-repair calibration or coding. Confirm that the SRS warning lamp extinguishes and no related codes return.
Likely causes
- Damaged wiring in the seat harness (pinched at seat rail or side bolster)
- Corroded or pushed-out contact at pretensioner connector
- Pretensioner element is open (deployed) or has very low/high resistance
- Airbag ECU output driver failed and cannot command deployment
- Related SRS sensor or communication fault causing control circuit to be disabled
Fault status
Status
Driver Seat Belt Pretensioner A deployment control fault — circuit open/short or pretensioner deployed. SRS system may be disabled; repair required before restoring full occupant protection.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
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Code
B0070
LAND ROVER
B — Body
of the seat belt pre-tensioner control driver pre-tension deployment control seat belt
Views:
UK: 6
EN: 21
RU: 8
AI status
Completed
Completed
100%
Causes
- Open or shorted pretensioner wiring
- Corroded, loose or damaged pretensioner connector
- Seat belt pretensioner has deployed (pyrotechnic device used)
- Faulty pretensioner (squib) internal failure
- Faulty airbag/SRS control module or driver output stage
- Poor ground or battery supply to SRS module
Symptoms
- SRS / airbag warning lamp illuminated or flashing
- Stored/or active B0070 DTC in SRS control module
- Seat belt pretensioner not available (after deployment) or disabled
- Multiple SRS-related codes may be present
- Possible inability to clear the SRS warning until fault is repaired
What to check
- Read and record all SRS codes and freeze-frame data with an airbag-capable scan tool.
- Check vehicle history for prior deployment or repair work to SRS components.
- Visually inspect pretensioner connector and wiring along the seat harness and under the seat.
- Ensure battery is disconnected and wait the manufacturer-specified time before touching SRS circuits.
- Measure continuity/resistance of the pretensioner squib with battery disconnected.
- Check for shorts to ground or battery in the squib circuit between the pretensioner and the airbag module.
Signal parameters
- Pretensioner squib resistance typically very low — commonly about 0.5–3 ohms (manufacturer-specific).
- Open-circuit/infinite resistance indicates an open or deployed pretensioner.
- Measured short to chassis ground or battery indicates wiring short; resistance near 0 ohms requires tracing.
- No significant voltage should be present at the squib while the system is at rest; do not apply power to squib.
Diagnostic algorithm
- Use a diagnostic tool that supports SRS systems to read all related codes and note freeze-frame and history (confirm if pretensioner was deployed).
- Verify vehicle fitment and any service history showing airbag/pretensioner replacement or crash repairs.
- Follow safety precautions: disable SRS power (disconnect battery negative) and wait the manufacturer-recommended time before working on the system.
- Perform visual inspection of the pretensioner connector, terminals and wiring along the seat harness and at seat anchor points; look for chafing, pinches, corrosion and disconnected pins.
- With battery disconnected, measure resistance across the pretensioner squib connector using a low-impedance ohmmeter. Compare to manufacturer spec (typical 0.5–3 ohms).
- If resistance is open/infinite, trace continuity back toward the SRS module to find open wiring or connectors; repair damaged wires and connectors.
- If resistance is near zero or shows short to chassis/battery, isolate section by section to locate short and repair insulation or connector faults.
- If pretensioner resistance is within spec but code remains, verify wiring integrity at SRS module pins and check module output drivers or internal faults with a qualified SRS scanner or oscilloscope per manufacturer procedure.
- Replace the pretensioner if it has deployed or fails resistance tests. After replacement, follow manufacturer's requirements for connector orientation, torque, and single-use component handling.
- If SRS module is suspected faulty after harness and pretensioner check, follow manufacturer diagnostic flow for module testing/replacement and coding. Do not replace SRS module without confirming wiring and load.
- Clear codes, reconnect battery, and perform SRS system self-check and any required post-repair calibration or coding. Confirm that the SRS warning lamp extinguishes and no related codes return.
Likely causes
- Damaged wiring in the seat harness (pinched at seat rail or side bolster)
- Corroded or pushed-out contact at pretensioner connector
- Pretensioner element is open (deployed) or has very low/high resistance
- Airbag ECU output driver failed and cannot command deployment
- Related SRS sensor or communication fault causing control circuit to be disabled
Fault status
Status
Driver Seat Belt Pretensioner A deployment control fault — circuit open/short or pretensioner deployed. SRS system may be disabled; repair required before restoring full occupant protection.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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