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Home / DTC / B0070 — Driver Seat Belt Pretensioner A Deployment Control

B0070 — Driver Seat Belt Pretensioner A Deployment Control

Detailed page for trouble code B0070.

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11,451generic
22,461specific
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Code

B0070

Generic B — Body

Driver Seat Belt Pretensioner A Deployment Control

Brand: Generic
Type: B — Body
Views: UK: 28 EN: 198 RU: 61
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Use a diagnostic tool that supports SRS systems to read all related codes and note freeze-frame and history (confirm if pretensioner was deployed).
  2. Verify vehicle fitment and any service history showing airbag/pretensioner replacement or crash repairs.
  3. Follow safety precautions: disable SRS power (disconnect battery negative) and wait the manufacturer-recommended time before working on the system.
  4. 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.
  5. With battery disconnected, measure resistance across the pretensioner squib connector using a low-impedance ohmmeter. Compare to manufacturer spec (typical 0.5–3 ohms).
  6. If resistance is open/infinite, trace continuity back toward the SRS module to find open wiring or connectors; repair damaged wires and connectors.
  7. If resistance is near zero or shows short to chassis/battery, isolate section by section to locate short and repair insulation or connector faults.
  8. 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.
  9. 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.
  10. 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.
  11. 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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B0071 B0072 B0050 B0051 B0100
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Code

B0070

HUMMER B — Body

Roof Rail Module-Right Deployment Loop Circuit

Brand: HUMMER
Type: B — Body
Views: UK: 19 EN: 181 RU: 33
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Use a diagnostic tool that supports SRS systems to read all related codes and note freeze-frame and history (confirm if pretensioner was deployed).
  2. Verify vehicle fitment and any service history showing airbag/pretensioner replacement or crash repairs.
  3. Follow safety precautions: disable SRS power (disconnect battery negative) and wait the manufacturer-recommended time before working on the system.
  4. 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.
  5. With battery disconnected, measure resistance across the pretensioner squib connector using a low-impedance ohmmeter. Compare to manufacturer spec (typical 0.5–3 ohms).
  6. If resistance is open/infinite, trace continuity back toward the SRS module to find open wiring or connectors; repair damaged wires and connectors.
  7. If resistance is near zero or shows short to chassis/battery, isolate section by section to locate short and repair insulation or connector faults.
  8. 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.
  9. 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.
  10. 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.
  11. 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

B0071 B0072 B0050 B0051 B0100
Repair manuals

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138

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HUMMER

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Code

B0070

LAND ROVER B — Body

of the seat belt pre-tensioner control driver pre-tension deployment control seat belt

Brand: LAND ROVER
Type: B — Body
Views: UK: 14 EN: 175 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Use a diagnostic tool that supports SRS systems to read all related codes and note freeze-frame and history (confirm if pretensioner was deployed).
  2. Verify vehicle fitment and any service history showing airbag/pretensioner replacement or crash repairs.
  3. Follow safety precautions: disable SRS power (disconnect battery negative) and wait the manufacturer-recommended time before working on the system.
  4. 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.
  5. With battery disconnected, measure resistance across the pretensioner squib connector using a low-impedance ohmmeter. Compare to manufacturer spec (typical 0.5–3 ohms).
  6. If resistance is open/infinite, trace continuity back toward the SRS module to find open wiring or connectors; repair damaged wires and connectors.
  7. If resistance is near zero or shows short to chassis/battery, isolate section by section to locate short and repair insulation or connector faults.
  8. 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.
  9. 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.
  10. 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.
  11. 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

B0071 B0072 B0050 B0051 B0100
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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