Code
B0071
Generic
B — Body
First Row Center Seat Belt Pretensioner Deployment Control
Views:
UK: 16
EN: 26
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the center pretensioner squib
- Poor or corroded connector at the pretensioner or airbag control module (ACM/RCM)
- High or low squib resistance (out of expected range)
- Previous deployment where the pretensioner has not been replaced
- Faulty airbag/restraints control module or internal driver circuit
- Poor ground or battery/charging system voltage issues during SRS checks
Symptoms
- SRS/airbag warning lamp illuminated on instrument panel
- Seat belt pretensioner disabled or warning message (if equipped)
- Possible stored crash event or deployment history in SRS module
- Vehicle may show additional SRS-related DTCs
What to check
- Use an OBD/SRS-capable scan tool to read and record all stored SRS codes and freeze frame data
- Verify battery voltage is stable (typically 12V–14.5V) before diagnostics
- Visually inspect connectors and wiring for the center pretensioner: look for broken pins, corrosion, or damage under the seat/console
- Inspect seats, bolts and trim for signs of previous deployment or repair
- Check for any crash data or deployment flags stored in the airbag control module
- Do not attempt to fire or simulate deployment; follow manufacturer safety procedures for SRS work
Signal parameters
- Typical squib resistance (varies by manufacturer) commonly ~1–3 Ω (low resistance). Note: values differ by vehicle — consult OEM spec.
- Open circuit: very high/OL resistance — indicates broken/removed squib or connector open
- Short to ground/low resistance
- Module output test: described as a controlled firing pulse; do not attempt to apply external voltage — use factory diagnostic routines only
Diagnostic algorithm
- Read and record all SRS/airbag codes with a proper scan tool; note any related codes and crash data.
- Disconnect battery negative and wait the manufacturer-specified time to allow system capacitors to discharge (commonly 10–15 minutes).
- Visually inspect connector(s) and wiring to the first-row center pretensioner (under seat/console). Repair or secure any damaged wiring or connectors.
- With battery disconnected and following OEM safety directions, check continuity/resistance of the pretensioner circuit at the connector using a digital multimeter. Compare to OEM spec. Do not apply power to the squib. If resistance is within spec, proceed.
- Check for opens/shorts between squib circuit and vehicle ground/power rails. Back-probe connectors (with correct safety procedures) or disconnect and test harness continuity to module connector.
- If wiring and squib resistance are out of spec (open, high resistance, or short), repair harness/connector or replace pretensioner assembly as required.
- If wiring and pretensioner test OK, check airbag control module connections and grounds. Clear codes and perform SRS self-tests with scan tool. If code returns, consider module fault or software issue—verify module programming/part number and check for TSBs.
- If pretensioner was deployed in a prior event, replace squib/assembly and any required deployment-related parts, and clear crash data per OEM procedures.
- After repairs, reconnect battery, clear codes, and confirm no SRS warnings and that scan tool reports no active faults. Perform any required post-repair SRS system checks or calibrations.
Likely causes
- Disconnected or damaged connector at center seat buckle/retractor pretensioner
- Cut, pinched or rubbed-through wiring in the harness under the seat or center console
- Corroded terminal(s) at pretensioner or module connector
- Pretensioner squib already deployed (open circuit)
- Failing or damaged ACM/RCM that cannot correctly control/monitor the squib
Fault status
Status
SRS fault detected for first-row center seat belt pretensioner deployment control circuit — deployment circuit abnormal (open, short, or out-of-range resistance) or module control fault.
Repair difficulty: Hard
Diagnostic time: 1-3 hours
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Code
B0071
HUMMER
B — Body
Roof Rail Module-Right Deployment Loop Circuit
Views:
UK: 7
EN: 10
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the center pretensioner squib
- Poor or corroded connector at the pretensioner or airbag control module (ACM/RCM)
- High or low squib resistance (out of expected range)
- Previous deployment where the pretensioner has not been replaced
- Faulty airbag/restraints control module or internal driver circuit
- Poor ground or battery/charging system voltage issues during SRS checks
Symptoms
- SRS/airbag warning lamp illuminated on instrument panel
- Seat belt pretensioner disabled or warning message (if equipped)
- Possible stored crash event or deployment history in SRS module
- Vehicle may show additional SRS-related DTCs
What to check
- Use an OBD/SRS-capable scan tool to read and record all stored SRS codes and freeze frame data
- Verify battery voltage is stable (typically 12V–14.5V) before diagnostics
- Visually inspect connectors and wiring for the center pretensioner: look for broken pins, corrosion, or damage under the seat/console
- Inspect seats, bolts and trim for signs of previous deployment or repair
- Check for any crash data or deployment flags stored in the airbag control module
- Do not attempt to fire or simulate deployment; follow manufacturer safety procedures for SRS work
Signal parameters
- Typical squib resistance (varies by manufacturer) commonly ~1–3 Ω (low resistance). Note: values differ by vehicle — consult OEM spec.
- Open circuit: very high/OL resistance — indicates broken/removed squib or connector open
- Short to ground/low resistance
- Module output test: described as a controlled firing pulse; do not attempt to apply external voltage — use factory diagnostic routines only
Diagnostic algorithm
- Read and record all SRS/airbag codes with a proper scan tool; note any related codes and crash data.
- Disconnect battery negative and wait the manufacturer-specified time to allow system capacitors to discharge (commonly 10–15 minutes).
- Visually inspect connector(s) and wiring to the first-row center pretensioner (under seat/console). Repair or secure any damaged wiring or connectors.
- With battery disconnected and following OEM safety directions, check continuity/resistance of the pretensioner circuit at the connector using a digital multimeter. Compare to OEM spec. Do not apply power to the squib. If resistance is within spec, proceed.
- Check for opens/shorts between squib circuit and vehicle ground/power rails. Back-probe connectors (with correct safety procedures) or disconnect and test harness continuity to module connector.
- If wiring and squib resistance are out of spec (open, high resistance, or short), repair harness/connector or replace pretensioner assembly as required.
- If wiring and pretensioner test OK, check airbag control module connections and grounds. Clear codes and perform SRS self-tests with scan tool. If code returns, consider module fault or software issue—verify module programming/part number and check for TSBs.
- If pretensioner was deployed in a prior event, replace squib/assembly and any required deployment-related parts, and clear crash data per OEM procedures.
- After repairs, reconnect battery, clear codes, and confirm no SRS warnings and that scan tool reports no active faults. Perform any required post-repair SRS system checks or calibrations.
Likely causes
- Disconnected or damaged connector at center seat buckle/retractor pretensioner
- Cut, pinched or rubbed-through wiring in the harness under the seat or center console
- Corroded terminal(s) at pretensioner or module connector
- Pretensioner squib already deployed (open circuit)
- Failing or damaged ACM/RCM that cannot correctly control/monitor the squib
Fault status
Status
SRS fault detected for first-row center seat belt pretensioner deployment control circuit — deployment circuit abnormal (open, short, or out-of-range resistance) or module control fault.
Repair difficulty: Hard
Diagnostic time: 1-3 hours
Similar codes
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