Code
B0074
Generic
B — Body
Second Row Center Seat Belt Pretensioner Deployment Control
AI status
Completed
Completed
100%
Causes
- Open or short in pretensioner (squib) wiring
- Corroded or loose connector at pretensioner or module
- Failed pretensioner (electrical squib)
- Faulty airbag/SRS control module or module software fault
- Poor ground or supply to SRS module
- Damage from previous crash repairs or seat removal
Symptoms
- SRS/Airbag warning lamp illuminated
- Seat belt pretensioner may not deploy in a crash
- Vehicle may fail safety inspection or diagnostic checks
- Stored B0074 and possibly related SRS codes in airbag module
- Possible intermittent warning lamp or communication errors
What to check
- Scan airbag/SRS module for B0074 and any related codes; record freeze-frame and MIL history
- Visually inspect center second-row seat, pretensioner connector, and harness for damage, corrosion, or loose pins
- Verify SRS module power, ground, and CAN communication circuits
- Check for previous deployment history or crash repair documentation
- Measure squib resistance and continuity (vehicle-specific values) with battery disconnected per safety procedure
- Inspect fuses and relays related to SRS/pretensioner circuit
Signal parameters
- SRS module DTC flag for pretensioner circuit (B0074) and timestamp/freeze-frame
- Pretensioner (squib) resistance: typically low ohms — consult vehicle-specific specification
- Continuity between pretensioner connector and SRS module
- Module supply voltage and ground integrity (VBatt, ground volts)
- CAN/LSB messages/status from SRS module indicating pretensioner state
- Short-to-ground or short-to-voltage indications on deployment circuit
Diagnostic algorithm
- Read and record all SRS codes and freeze-frame data with a capable scan tool.
- Follow manufacturer safety procedure: disable battery negative terminal and wait specified time before handling SRS components.
- Perform a visual inspection of the second-row center seat, pretensioner connector, and harness for pin damage, corrosion, or physical chafing.
- Reconnect battery per procedure only after checks, then verify power/ground to SRS module and check for related communication faults.
- With battery disconnected and using vehicle-specific precautions, measure resistance of the pretensioner squib and compare to spec. Check continuity to the SRS module connector.
- Wiggle-test harness while monitoring continuity and scan tool for intermittent faults; inspect routing for chafe points at seat tracks.
- If open/short found in wiring or connector, repair or replace harness/connector and retest continuity.
- If pretensioner resistance is out of specification, replace the pretensioner assembly per manufacturer procedure.
- If wiring and pretensioner are good, investigate SRS control module for internal fault, poor ground, or software fault; consult manufacturer tech info for module bench tests or reprogramming.
- After repairs, clear codes, perform SRS self-test with scan tool, and verify no reoccurrence. If code returns, escalate to module-level diagnosis or dealer-level SRS resources.
Likely causes
- Broken/disconnected wiring under the seat from movement or service
- High resistance/short in pretensioner squib coil (over/under resistance)
- Connector corrosion or bent terminals at seat pretensioner
- SRS control module reporting circuit fault due to internal failure
- Blown SRS fuse or intermittent power/ground to module
Fault status
Status
B0074 — Second row center seat belt pretensioner deployment control circuit malfunction (SRS).
Repair difficulty: Hard
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
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Code
B0074
HUMMER
B — Body
Supplemental Deployment Loop #1 Open
AI status
Completed
Completed
100%
Causes
- Open or short in pretensioner (squib) wiring
- Corroded or loose connector at pretensioner or module
- Failed pretensioner (electrical squib)
- Faulty airbag/SRS control module or module software fault
- Poor ground or supply to SRS module
- Damage from previous crash repairs or seat removal
Symptoms
- SRS/Airbag warning lamp illuminated
- Seat belt pretensioner may not deploy in a crash
- Vehicle may fail safety inspection or diagnostic checks
- Stored B0074 and possibly related SRS codes in airbag module
- Possible intermittent warning lamp or communication errors
What to check
- Scan airbag/SRS module for B0074 and any related codes; record freeze-frame and MIL history
- Visually inspect center second-row seat, pretensioner connector, and harness for damage, corrosion, or loose pins
- Verify SRS module power, ground, and CAN communication circuits
- Check for previous deployment history or crash repair documentation
- Measure squib resistance and continuity (vehicle-specific values) with battery disconnected per safety procedure
- Inspect fuses and relays related to SRS/pretensioner circuit
Signal parameters
- SRS module DTC flag for pretensioner circuit (B0074) and timestamp/freeze-frame
- Pretensioner (squib) resistance: typically low ohms — consult vehicle-specific specification
- Continuity between pretensioner connector and SRS module
- Module supply voltage and ground integrity (VBatt, ground volts)
- CAN/LSB messages/status from SRS module indicating pretensioner state
- Short-to-ground or short-to-voltage indications on deployment circuit
Diagnostic algorithm
- Read and record all SRS codes and freeze-frame data with a capable scan tool.
- Follow manufacturer safety procedure: disable battery negative terminal and wait specified time before handling SRS components.
- Perform a visual inspection of the second-row center seat, pretensioner connector, and harness for pin damage, corrosion, or physical chafing.
- Reconnect battery per procedure only after checks, then verify power/ground to SRS module and check for related communication faults.
- With battery disconnected and using vehicle-specific precautions, measure resistance of the pretensioner squib and compare to spec. Check continuity to the SRS module connector.
- Wiggle-test harness while monitoring continuity and scan tool for intermittent faults; inspect routing for chafe points at seat tracks.
- If open/short found in wiring or connector, repair or replace harness/connector and retest continuity.
- If pretensioner resistance is out of specification, replace the pretensioner assembly per manufacturer procedure.
- If wiring and pretensioner are good, investigate SRS control module for internal fault, poor ground, or software fault; consult manufacturer tech info for module bench tests or reprogramming.
- After repairs, clear codes, perform SRS self-test with scan tool, and verify no reoccurrence. If code returns, escalate to module-level diagnosis or dealer-level SRS resources.
Likely causes
- Broken/disconnected wiring under the seat from movement or service
- High resistance/short in pretensioner squib coil (over/under resistance)
- Connector corrosion or bent terminals at seat pretensioner
- SRS control module reporting circuit fault due to internal failure
- Blown SRS fuse or intermittent power/ground to module
Fault status
Status
B0074 — Second row center seat belt pretensioner deployment control circuit malfunction (SRS).
Repair difficulty: Hard
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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