Code
B0073
Generic
B — Body
Second Row Left Seat Belt Pretensioner Deployment Control
Views:
UK: 22
EN: 20
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or shorted squib (pretensioner) wiring
- Corroded or loose connector at the pretensioner or airbag control module
- High resistance in the pretensioner circuit (partial break, damaged wiring)
- Previously deployed pretensioner not replaced or improperly repaired
- Water intrusion or physical damage to seat/cable harness
- Faulty airbag control module or internal driver circuit
Symptoms
- SRS/airbag warning light illuminated on instrument cluster
- Related airbag or pretensioner disabled by ACU (fault stored)
- Possible diagnostic messages on manufacturer scan tool
- No activation of the pretensioner in the event of a crash (if not repaired)
What to check
- Read stored codes and freeze frame data with a capable SRS scan tool; note any additional SRS codes
- Check for deployment history (has this pretensioner been deployed previously?)
- Visually inspect the second-row left seat, belt retractor, and wiring harness for damage, pinched wires, or corrosion
- Inspect connectors at the pretensioner and at the ACU for loose pins, corrosion, or pushed-out terminals
- Measure squib circuit resistance at the pretensioner connector (compare to OEM spec) and check continuity to the ACU
- Check for water entry or physical damage in the seat base and floor routing areas
Signal parameters
- Typical pretensioner (squib) resistance: consult OEM — commonly in the low ohm range (example: ~0.5–5 Ω). Use OEM spec for exact value.
- Open-circuit: infinite/OL resistance (indicates open wiring or failed squib)
- Short-to-ground/short-to-power: very low resistance or near 0 Ω (indicates short)
- No firing voltage present at squib during normal key-on (firing voltage is only supplied by ACU during deployment)
- ACU fault codes and readiness bits visible via OEM scan tool; communication on SRS bus should be normal
Diagnostic algorithm
- IMPORTANT SAFETY: Disable the vehicle airbag system per manufacturer procedure (battery disconnect and required wait time) before disconnecting connectors or removing seats.
- Use an OEM-capable SRS scan tool to read and record all SRS codes and clear codes after initial inspection only if safe to do so.
- Visually inspect the second-row left seat, buckle, retractor and wiring harness for damage, cuts, abrasions, or corrosion.
- Remove access covers and disconnect the pretensioner connector. Inspect pins and housing for corrosion, burning, or loose terminals.
- Measure resistance of the pretensioner squib at the connector. Compare to OEM specification. If open or out of spec, replace pretensioner assembly.
- If squib resistance is within spec, perform continuity and short-to-ground/power tests of wiring from the pretensioner connector to the ACU connector. Repair any wiring faults.
- If wiring checks good and resistance is correct, inspect ACU connectors and wiring for damage. Check ACU ground and power feeds.
- If wiring and pretensioner are good and fault remains, consider ACU internal driver fault — consult vehicle service manual for ACU bench testing or replacement procedures.
- After repairs, reconnect everything, re-enable the SRS system, clear codes with the scan tool, and confirm the B0073 does not return and that the SRS lamp behaves normally.
Likely causes
- Broken/chafed wiring in the seat wiring harness (seat belt retractor area)
- Connector pin corrosion or pushed-out terminals at the pretensioner
- Defective pretensioner squib (open or shorted element)
- Stress/strain damage where the harness passes through the seat or floor
- ACU fault if wiring and pretensioner test within specification
Fault status
Status
SRS fault: second-row left seat belt pretensioner deployment circuit detected a fault. The airbag control unit has logged B0073; pretensioner may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
B0073
HUMMER
B — Body
Supplemental Deployment Loop #1 Resistance Low
Views:
UK: 7
EN: 8
RU: 8
AI status
Completed
Completed
100%
Causes
- Open or shorted squib (pretensioner) wiring
- Corroded or loose connector at the pretensioner or airbag control module
- High resistance in the pretensioner circuit (partial break, damaged wiring)
- Previously deployed pretensioner not replaced or improperly repaired
- Water intrusion or physical damage to seat/cable harness
- Faulty airbag control module or internal driver circuit
Symptoms
- SRS/airbag warning light illuminated on instrument cluster
- Related airbag or pretensioner disabled by ACU (fault stored)
- Possible diagnostic messages on manufacturer scan tool
- No activation of the pretensioner in the event of a crash (if not repaired)
What to check
- Read stored codes and freeze frame data with a capable SRS scan tool; note any additional SRS codes
- Check for deployment history (has this pretensioner been deployed previously?)
- Visually inspect the second-row left seat, belt retractor, and wiring harness for damage, pinched wires, or corrosion
- Inspect connectors at the pretensioner and at the ACU for loose pins, corrosion, or pushed-out terminals
- Measure squib circuit resistance at the pretensioner connector (compare to OEM spec) and check continuity to the ACU
- Check for water entry or physical damage in the seat base and floor routing areas
Signal parameters
- Typical pretensioner (squib) resistance: consult OEM — commonly in the low ohm range (example: ~0.5–5 Ω). Use OEM spec for exact value.
- Open-circuit: infinite/OL resistance (indicates open wiring or failed squib)
- Short-to-ground/short-to-power: very low resistance or near 0 Ω (indicates short)
- No firing voltage present at squib during normal key-on (firing voltage is only supplied by ACU during deployment)
- ACU fault codes and readiness bits visible via OEM scan tool; communication on SRS bus should be normal
Diagnostic algorithm
- IMPORTANT SAFETY: Disable the vehicle airbag system per manufacturer procedure (battery disconnect and required wait time) before disconnecting connectors or removing seats.
- Use an OEM-capable SRS scan tool to read and record all SRS codes and clear codes after initial inspection only if safe to do so.
- Visually inspect the second-row left seat, buckle, retractor and wiring harness for damage, cuts, abrasions, or corrosion.
- Remove access covers and disconnect the pretensioner connector. Inspect pins and housing for corrosion, burning, or loose terminals.
- Measure resistance of the pretensioner squib at the connector. Compare to OEM specification. If open or out of spec, replace pretensioner assembly.
- If squib resistance is within spec, perform continuity and short-to-ground/power tests of wiring from the pretensioner connector to the ACU connector. Repair any wiring faults.
- If wiring checks good and resistance is correct, inspect ACU connectors and wiring for damage. Check ACU ground and power feeds.
- If wiring and pretensioner are good and fault remains, consider ACU internal driver fault — consult vehicle service manual for ACU bench testing or replacement procedures.
- After repairs, reconnect everything, re-enable the SRS system, clear codes with the scan tool, and confirm the B0073 does not return and that the SRS lamp behaves normally.
Likely causes
- Broken/chafed wiring in the seat wiring harness (seat belt retractor area)
- Connector pin corrosion or pushed-out terminals at the pretensioner
- Defective pretensioner squib (open or shorted element)
- Stress/strain damage where the harness passes through the seat or floor
- ACU fault if wiring and pretensioner test within specification
Fault status
Status
SRS fault: second-row left seat belt pretensioner deployment circuit detected a fault. The airbag control unit has logged B0073; pretensioner may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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Code
B0073
LAND ROVER
B — Body
second line of safety left control deployment belt tensioner
Views:
UK: 8
EN: 11
RU: 7
AI status
Completed
Completed
100%
Causes
- Open or shorted squib (pretensioner) wiring
- Corroded or loose connector at the pretensioner or airbag control module
- High resistance in the pretensioner circuit (partial break, damaged wiring)
- Previously deployed pretensioner not replaced or improperly repaired
- Water intrusion or physical damage to seat/cable harness
- Faulty airbag control module or internal driver circuit
Symptoms
- SRS/airbag warning light illuminated on instrument cluster
- Related airbag or pretensioner disabled by ACU (fault stored)
- Possible diagnostic messages on manufacturer scan tool
- No activation of the pretensioner in the event of a crash (if not repaired)
What to check
- Read stored codes and freeze frame data with a capable SRS scan tool; note any additional SRS codes
- Check for deployment history (has this pretensioner been deployed previously?)
- Visually inspect the second-row left seat, belt retractor, and wiring harness for damage, pinched wires, or corrosion
- Inspect connectors at the pretensioner and at the ACU for loose pins, corrosion, or pushed-out terminals
- Measure squib circuit resistance at the pretensioner connector (compare to OEM spec) and check continuity to the ACU
- Check for water entry or physical damage in the seat base and floor routing areas
Signal parameters
- Typical pretensioner (squib) resistance: consult OEM — commonly in the low ohm range (example: ~0.5–5 Ω). Use OEM spec for exact value.
- Open-circuit: infinite/OL resistance (indicates open wiring or failed squib)
- Short-to-ground/short-to-power: very low resistance or near 0 Ω (indicates short)
- No firing voltage present at squib during normal key-on (firing voltage is only supplied by ACU during deployment)
- ACU fault codes and readiness bits visible via OEM scan tool; communication on SRS bus should be normal
Diagnostic algorithm
- IMPORTANT SAFETY: Disable the vehicle airbag system per manufacturer procedure (battery disconnect and required wait time) before disconnecting connectors or removing seats.
- Use an OEM-capable SRS scan tool to read and record all SRS codes and clear codes after initial inspection only if safe to do so.
- Visually inspect the second-row left seat, buckle, retractor and wiring harness for damage, cuts, abrasions, or corrosion.
- Remove access covers and disconnect the pretensioner connector. Inspect pins and housing for corrosion, burning, or loose terminals.
- Measure resistance of the pretensioner squib at the connector. Compare to OEM specification. If open or out of spec, replace pretensioner assembly.
- If squib resistance is within spec, perform continuity and short-to-ground/power tests of wiring from the pretensioner connector to the ACU connector. Repair any wiring faults.
- If wiring checks good and resistance is correct, inspect ACU connectors and wiring for damage. Check ACU ground and power feeds.
- If wiring and pretensioner are good and fault remains, consider ACU internal driver fault — consult vehicle service manual for ACU bench testing or replacement procedures.
- After repairs, reconnect everything, re-enable the SRS system, clear codes with the scan tool, and confirm the B0073 does not return and that the SRS lamp behaves normally.
Likely causes
- Broken/chafed wiring in the seat wiring harness (seat belt retractor area)
- Connector pin corrosion or pushed-out terminals at the pretensioner
- Defective pretensioner squib (open or shorted element)
- Stress/strain damage where the harness passes through the seat or floor
- ACU fault if wiring and pretensioner test within specification
Fault status
Status
SRS fault: second-row left seat belt pretensioner deployment circuit detected a fault. The airbag control unit has logged B0073; pretensioner may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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