Code
B1142
HUMMER
B — Body
Driver Pretens. Deploy. Loop Res. Low
Views:
UK: 10
EN: 17
RU: 12
AI status
Completed
Completed
100%
Causes
- Short to ground or across the pretensioner squib wiring
- Damaged or chafed wiring harness under the driver seat
- Corroded, bent or pushed-back connector pins at the pretensioner or SRS module
- Faulty or internally shorted pretensioner (squib)
- Incorrect or damaged replacement pretensioner (aftermarket/incorrect part)
- Faulty SRS control module (airbag/SDM) or internal driver deployment driver circuit
Symptoms
- SRS / airbag warning lamp illuminated
- One or more SRS-related fault codes stored (including B1142)
- Possible disabling of pretensioner deployment until repaired
- Vehicle may fail SRS self-check or inspection
- No other driveability symptoms in most cases
What to check
- Read and record freeze-frame and all SRS codes with a capable scan tool
- Verify vehicle history for prior deployment or seat/airbag repairs
- Visually inspect driver seat, seat belt pretensioner, and wiring harness for damage, chafing, or pinched areas
- Inspect pretensioner and SRS module connectors for bent pins, corrosion, or contamination
- Measure resistance of the pretensioner squib with connector disconnected (follow OEM procedures and safety precautions)
- Perform continuity and short-to-ground checks on pretensioner wiring back to the SRS module
Signal parameters
- Pretensioner (squib) circuit is a low-ohm circuit—expected to show a low but finite resistance per OEM spec (consult service manual for exact value and tolerance)
- A B1142 indicates measured resistance is below the module’s lower threshold (near short or 0 ohms condition)
- With connector disconnected, measure open-circuit continuity to ground (should be open) and continuity between squib terminals (should match spec)
- Supply voltage to SRS module should be normal (battery voltage) but do not apply power to squib for testing—use passive resistance measurements only
- Live data / SRS module self-test status available on a diagnostic scanner; note state before and after repairs
Diagnostic algorithm
- Safety first: disconnect the battery and wait the manufacturer-specified time to disable the SRS system before working on airbag/pretensioner circuits. Follow OEM procedures.
- Use a scan tool to confirm B1142 and clear the code only after repairs; record any additional SRS codes.
- Visually inspect driver seat area, pretensioner assembly, and harness for damage, abrasion, or signs of previous deployment/repair.
- Disconnect the pretensioner connector (with ignition off and battery disconnected) and measure squib resistance at the connector. Compare to the service manual specification.
- If resistance reads very low (near 0 ohms) or shorted, suspect the pretensioner squib or a short across the squib terminals—replace pretensioner per OEM instructions.
- If squib resistance at pretensioner is within spec, test continuity and insulation between the squib circuit and chassis ground and between squib signal wires and other circuits to locate a short.
- Inspect and wiggle-test wiring under the seat while monitoring resistance/continuity to find intermittent shorts caused by seat movement.
- Repair damaged wiring or connectors: replace pigtails, repair chafed sections with proper crimping/soldering and insulation per OEM practice; replace corroded connectors.
- If wiring and pretensioner check good, suspect module side fault—inspect SRS module connector pins and harness at the module. If necessary, test or replace the SRS/airbag control module following OEM diagnostic flow.
- After repairs, reconnect battery, use a scan tool to clear codes, and perform SRS system self-tests. Confirm B1142 does not return and verify no additional SRS faults are present.
- Document repairs and advise that any pretensioner replaced must meet OEM part and installation requirements; perform post-repair system checks and any required calibration.
Likely causes
- Shorted wiring where harness rubs on the seat frame or floor
- Connector pin shorted or bridging at the pretensioner plug
- Pretensioner has low internal resistance (failed squib)
- Low-resistance path created by corrosion/contamination inside connector
- Incorrect wiring after seat or module replacement
Fault status
Status
SRS control module reports unusually low resistance in the driver pretensioner deployment loop — possible shorted pretensioner, wiring short, connector fault, or module issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
B1142
LAND ROVER
B — Body
Ignition status 1
Views:
UK: 5
EN: 15
RU: 9
AI status
Completed
Completed
100%
Causes
- Short to ground or across the pretensioner squib wiring
- Damaged or chafed wiring harness under the driver seat
- Corroded, bent or pushed-back connector pins at the pretensioner or SRS module
- Faulty or internally shorted pretensioner (squib)
- Incorrect or damaged replacement pretensioner (aftermarket/incorrect part)
- Faulty SRS control module (airbag/SDM) or internal driver deployment driver circuit
Symptoms
- SRS / airbag warning lamp illuminated
- One or more SRS-related fault codes stored (including B1142)
- Possible disabling of pretensioner deployment until repaired
- Vehicle may fail SRS self-check or inspection
- No other driveability symptoms in most cases
What to check
- Read and record freeze-frame and all SRS codes with a capable scan tool
- Verify vehicle history for prior deployment or seat/airbag repairs
- Visually inspect driver seat, seat belt pretensioner, and wiring harness for damage, chafing, or pinched areas
- Inspect pretensioner and SRS module connectors for bent pins, corrosion, or contamination
- Measure resistance of the pretensioner squib with connector disconnected (follow OEM procedures and safety precautions)
- Perform continuity and short-to-ground checks on pretensioner wiring back to the SRS module
Signal parameters
- Pretensioner (squib) circuit is a low-ohm circuit—expected to show a low but finite resistance per OEM spec (consult service manual for exact value and tolerance)
- A B1142 indicates measured resistance is below the module’s lower threshold (near short or 0 ohms condition)
- With connector disconnected, measure open-circuit continuity to ground (should be open) and continuity between squib terminals (should match spec)
- Supply voltage to SRS module should be normal (battery voltage) but do not apply power to squib for testing—use passive resistance measurements only
- Live data / SRS module self-test status available on a diagnostic scanner; note state before and after repairs
Diagnostic algorithm
- Safety first: disconnect the battery and wait the manufacturer-specified time to disable the SRS system before working on airbag/pretensioner circuits. Follow OEM procedures.
- Use a scan tool to confirm B1142 and clear the code only after repairs; record any additional SRS codes.
- Visually inspect driver seat area, pretensioner assembly, and harness for damage, abrasion, or signs of previous deployment/repair.
- Disconnect the pretensioner connector (with ignition off and battery disconnected) and measure squib resistance at the connector. Compare to the service manual specification.
- If resistance reads very low (near 0 ohms) or shorted, suspect the pretensioner squib or a short across the squib terminals—replace pretensioner per OEM instructions.
- If squib resistance at pretensioner is within spec, test continuity and insulation between the squib circuit and chassis ground and between squib signal wires and other circuits to locate a short.
- Inspect and wiggle-test wiring under the seat while monitoring resistance/continuity to find intermittent shorts caused by seat movement.
- Repair damaged wiring or connectors: replace pigtails, repair chafed sections with proper crimping/soldering and insulation per OEM practice; replace corroded connectors.
- If wiring and pretensioner check good, suspect module side fault—inspect SRS module connector pins and harness at the module. If necessary, test or replace the SRS/airbag control module following OEM diagnostic flow.
- After repairs, reconnect battery, use a scan tool to clear codes, and perform SRS system self-tests. Confirm B1142 does not return and verify no additional SRS faults are present.
- Document repairs and advise that any pretensioner replaced must meet OEM part and installation requirements; perform post-repair system checks and any required calibration.
Likely causes
- Shorted wiring where harness rubs on the seat frame or floor
- Connector pin shorted or bridging at the pretensioner plug
- Pretensioner has low internal resistance (failed squib)
- Low-resistance path created by corrosion/contamination inside connector
- Incorrect wiring after seat or module replacement
Fault status
Status
SRS control module reports unusually low resistance in the driver pretensioner deployment loop — possible shorted pretensioner, wiring short, connector fault, or module issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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