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Home / DTC / B2782 — Driver Seat Belt Pretensioner Circuit Low Voltage

B2782 — Driver Seat Belt Pretensioner Circuit Low Voltage

Detailed page for trouble code B2782.

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11,914generic
22,491specific
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Code

B2782

Generic B — Body

Driver Seat Belt Pretensioner Circuit Low Voltage

Brand: Generic
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low vehicle battery voltage or poor charging system
  • Corroded, loose or damaged connector at pretensioner or SRS module
  • Open or high-resistance wiring in pretensioner circuit (broken conductor, damaged insulation)
  • Short to ground elsewhere in the circuit reducing voltage
  • Blown fuse or faulty SRS related relay
  • Faulty driver pretensioner (squib) with internal high resistance

Symptoms

  • SRS/airbag warning light illuminated on instrument cluster
  • Possible diagnostic trouble codes stored in SRS control module (including B2782 and related codes)
  • Seat belt pretensioner indicator (if equipped) may show fault
  • Vehicle may show reduced SRS readiness; pretensioner may not operate when needed

What to check

  • Scan SRS control module for current and history codes; record freeze-frame and related DTCs
  • Verify battery resting voltage and charging system (battery voltage ~12.0–12.8 V at rest, ~13.5–14.8 V with engine running)
  • Visual inspection of driver seat harness, connector, and pretensioner for damage, corrosion, water intrusion or signs of previous deployment
  • Inspect SRS-related fuses and relays
  • Backprobe the pretensioner connector with ignition ON (engine off) and measure supply voltage and signal against reference
  • Check continuity and resistance of pretensioner circuit (with battery disconnected and manufacturer procedures followed)

Signal parameters

  • Battery voltage (key ON, engine OFF): typically ~12 V — verify within manufacturer specification
  • Pretensioner supply voltage at connector (key ON, SRS powered): should equal battery voltage or specified feed voltage
  • Circuit resistance of pretensioner squib (measured per service manual): low resistance (manufacturer spec; typically a few ohms) — compare to spec
  • Continuity between pretensioner connector and SRS module pins: near zero ohms (per spec)
  • Insulation resistance to ground: should be very high (open) — no shorts

Diagnostic algorithm

  1. Read and record all SRS codes with a capable scan tool. Note any crash/deployment history. Do not clear codes yet.
  2. Check battery voltage and charging system. Charge or replace battery if voltage is low. Retest code conditions after stable battery.
  3. Visually inspect driver seat area: connectors, wiring harness, seat rails and pretensioner for damage, corrosion or evidence of deployment. Repair obvious damage.
  4. With ignition OFF and battery disconnected, follow manufacturer SRS safety procedures (allow capacitors to discharge for the recommended wait time) before disconnecting pretensioner connectors.
  5. Measure pretensioner resistance per service manual. If resistance is high or open, replace pretensioner assembly.
  6. With battery reconnected and ignition ON (engine OFF), backprobe the pretensioner connector and measure supply voltage and signal continuity to the SRS module. Compare voltages to battery voltage and specs.
  7. Perform wiring continuity and short-to-ground/short-to-voltage tests between pretensioner connector and SRS module pins. Repair any open/high-resistance wiring or short circuits (repair, splice, or replace as needed).
  8. Inspect and test SRS fuse/relay and supply circuits. Replace faulty fuses/relays and re-test.
  9. If wiring and pretensioner check good and low voltage persists, consider SRS control module internal fault. Follow manufacturer diagnostics for module testing/replacement.
  10. After repairs, clear codes, perform SRS system relearn if required, and verify no faults return. Confirm SRS warning light is extinguished and perform final system scan.

Likely causes

  • Damaged connector or poor pin contact at the seat pretensioner
  • High resistance in the pretensioner due to internal corrosion or partial wire break
  • Low battery or poor charging causing supply voltage below threshold
  • Short to ground on the pretensioner feed wire
  • SRS control module fault or blown fuse in the airbag supply circuit

Fault status

⚠️ Status
Stored when the SRS control module detects voltage below the expected threshold on the driver seat belt pretensioner (squib) circuit; SRS warning light may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

B2782

HUMMER B — Body

Body Control Module Configuration/Calibration Fault

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low vehicle battery voltage or poor charging system
  • Corroded, loose or damaged connector at pretensioner or SRS module
  • Open or high-resistance wiring in pretensioner circuit (broken conductor, damaged insulation)
  • Short to ground elsewhere in the circuit reducing voltage
  • Blown fuse or faulty SRS related relay
  • Faulty driver pretensioner (squib) with internal high resistance

Symptoms

  • SRS/airbag warning light illuminated on instrument cluster
  • Possible diagnostic trouble codes stored in SRS control module (including B2782 and related codes)
  • Seat belt pretensioner indicator (if equipped) may show fault
  • Vehicle may show reduced SRS readiness; pretensioner may not operate when needed

What to check

  • Scan SRS control module for current and history codes; record freeze-frame and related DTCs
  • Verify battery resting voltage and charging system (battery voltage ~12.0–12.8 V at rest, ~13.5–14.8 V with engine running)
  • Visual inspection of driver seat harness, connector, and pretensioner for damage, corrosion, water intrusion or signs of previous deployment
  • Inspect SRS-related fuses and relays
  • Backprobe the pretensioner connector with ignition ON (engine off) and measure supply voltage and signal against reference
  • Check continuity and resistance of pretensioner circuit (with battery disconnected and manufacturer procedures followed)

Signal parameters

  • Battery voltage (key ON, engine OFF): typically ~12 V — verify within manufacturer specification
  • Pretensioner supply voltage at connector (key ON, SRS powered): should equal battery voltage or specified feed voltage
  • Circuit resistance of pretensioner squib (measured per service manual): low resistance (manufacturer spec; typically a few ohms) — compare to spec
  • Continuity between pretensioner connector and SRS module pins: near zero ohms (per spec)
  • Insulation resistance to ground: should be very high (open) — no shorts

Diagnostic algorithm

  1. Read and record all SRS codes with a capable scan tool. Note any crash/deployment history. Do not clear codes yet.
  2. Check battery voltage and charging system. Charge or replace battery if voltage is low. Retest code conditions after stable battery.
  3. Visually inspect driver seat area: connectors, wiring harness, seat rails and pretensioner for damage, corrosion or evidence of deployment. Repair obvious damage.
  4. With ignition OFF and battery disconnected, follow manufacturer SRS safety procedures (allow capacitors to discharge for the recommended wait time) before disconnecting pretensioner connectors.
  5. Measure pretensioner resistance per service manual. If resistance is high or open, replace pretensioner assembly.
  6. With battery reconnected and ignition ON (engine OFF), backprobe the pretensioner connector and measure supply voltage and signal continuity to the SRS module. Compare voltages to battery voltage and specs.
  7. Perform wiring continuity and short-to-ground/short-to-voltage tests between pretensioner connector and SRS module pins. Repair any open/high-resistance wiring or short circuits (repair, splice, or replace as needed).
  8. Inspect and test SRS fuse/relay and supply circuits. Replace faulty fuses/relays and re-test.
  9. If wiring and pretensioner check good and low voltage persists, consider SRS control module internal fault. Follow manufacturer diagnostics for module testing/replacement.
  10. After repairs, clear codes, perform SRS system relearn if required, and verify no faults return. Confirm SRS warning light is extinguished and perform final system scan.

Likely causes

  • Damaged connector or poor pin contact at the seat pretensioner
  • High resistance in the pretensioner due to internal corrosion or partial wire break
  • Low battery or poor charging causing supply voltage below threshold
  • Short to ground on the pretensioner feed wire
  • SRS control module fault or blown fuse in the airbag supply circuit

Fault status

⚠️ Status
Stored when the SRS control module detects voltage below the expected threshold on the driver seat belt pretensioner (squib) circuit; SRS warning light may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2780 B2781 B2783 B2784 B1650
Repair manuals

Manual library for HUMMER

138

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HUMMER

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Code

B2782

LAND ROVER B — Body

indoor air quality sensor for automatic control of short-circuit temperature

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low vehicle battery voltage or poor charging system
  • Corroded, loose or damaged connector at pretensioner or SRS module
  • Open or high-resistance wiring in pretensioner circuit (broken conductor, damaged insulation)
  • Short to ground elsewhere in the circuit reducing voltage
  • Blown fuse or faulty SRS related relay
  • Faulty driver pretensioner (squib) with internal high resistance

Symptoms

  • SRS/airbag warning light illuminated on instrument cluster
  • Possible diagnostic trouble codes stored in SRS control module (including B2782 and related codes)
  • Seat belt pretensioner indicator (if equipped) may show fault
  • Vehicle may show reduced SRS readiness; pretensioner may not operate when needed

What to check

  • Scan SRS control module for current and history codes; record freeze-frame and related DTCs
  • Verify battery resting voltage and charging system (battery voltage ~12.0–12.8 V at rest, ~13.5–14.8 V with engine running)
  • Visual inspection of driver seat harness, connector, and pretensioner for damage, corrosion, water intrusion or signs of previous deployment
  • Inspect SRS-related fuses and relays
  • Backprobe the pretensioner connector with ignition ON (engine off) and measure supply voltage and signal against reference
  • Check continuity and resistance of pretensioner circuit (with battery disconnected and manufacturer procedures followed)

Signal parameters

  • Battery voltage (key ON, engine OFF): typically ~12 V — verify within manufacturer specification
  • Pretensioner supply voltage at connector (key ON, SRS powered): should equal battery voltage or specified feed voltage
  • Circuit resistance of pretensioner squib (measured per service manual): low resistance (manufacturer spec; typically a few ohms) — compare to spec
  • Continuity between pretensioner connector and SRS module pins: near zero ohms (per spec)
  • Insulation resistance to ground: should be very high (open) — no shorts

Diagnostic algorithm

  1. Read and record all SRS codes with a capable scan tool. Note any crash/deployment history. Do not clear codes yet.
  2. Check battery voltage and charging system. Charge or replace battery if voltage is low. Retest code conditions after stable battery.
  3. Visually inspect driver seat area: connectors, wiring harness, seat rails and pretensioner for damage, corrosion or evidence of deployment. Repair obvious damage.
  4. With ignition OFF and battery disconnected, follow manufacturer SRS safety procedures (allow capacitors to discharge for the recommended wait time) before disconnecting pretensioner connectors.
  5. Measure pretensioner resistance per service manual. If resistance is high or open, replace pretensioner assembly.
  6. With battery reconnected and ignition ON (engine OFF), backprobe the pretensioner connector and measure supply voltage and signal continuity to the SRS module. Compare voltages to battery voltage and specs.
  7. Perform wiring continuity and short-to-ground/short-to-voltage tests between pretensioner connector and SRS module pins. Repair any open/high-resistance wiring or short circuits (repair, splice, or replace as needed).
  8. Inspect and test SRS fuse/relay and supply circuits. Replace faulty fuses/relays and re-test.
  9. If wiring and pretensioner check good and low voltage persists, consider SRS control module internal fault. Follow manufacturer diagnostics for module testing/replacement.
  10. After repairs, clear codes, perform SRS system relearn if required, and verify no faults return. Confirm SRS warning light is extinguished and perform final system scan.

Likely causes

  • Damaged connector or poor pin contact at the seat pretensioner
  • High resistance in the pretensioner due to internal corrosion or partial wire break
  • Low battery or poor charging causing supply voltage below threshold
  • Short to ground on the pretensioner feed wire
  • SRS control module fault or blown fuse in the airbag supply circuit

Fault status

⚠️ Status
Stored when the SRS control module detects voltage below the expected threshold on the driver seat belt pretensioner (squib) circuit; SRS warning light may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2780 B2781 B2783 B2784 B1650
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 :)
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Code

B2782

LEXUS B — Body

Power Source Control ECU Malfunction

Brand: LEXUS
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low vehicle battery voltage or poor charging system
  • Corroded, loose or damaged connector at pretensioner or SRS module
  • Open or high-resistance wiring in pretensioner circuit (broken conductor, damaged insulation)
  • Short to ground elsewhere in the circuit reducing voltage
  • Blown fuse or faulty SRS related relay
  • Faulty driver pretensioner (squib) with internal high resistance

Symptoms

  • SRS/airbag warning light illuminated on instrument cluster
  • Possible diagnostic trouble codes stored in SRS control module (including B2782 and related codes)
  • Seat belt pretensioner indicator (if equipped) may show fault
  • Vehicle may show reduced SRS readiness; pretensioner may not operate when needed

What to check

  • Scan SRS control module for current and history codes; record freeze-frame and related DTCs
  • Verify battery resting voltage and charging system (battery voltage ~12.0–12.8 V at rest, ~13.5–14.8 V with engine running)
  • Visual inspection of driver seat harness, connector, and pretensioner for damage, corrosion, water intrusion or signs of previous deployment
  • Inspect SRS-related fuses and relays
  • Backprobe the pretensioner connector with ignition ON (engine off) and measure supply voltage and signal against reference
  • Check continuity and resistance of pretensioner circuit (with battery disconnected and manufacturer procedures followed)

Signal parameters

  • Battery voltage (key ON, engine OFF): typically ~12 V — verify within manufacturer specification
  • Pretensioner supply voltage at connector (key ON, SRS powered): should equal battery voltage or specified feed voltage
  • Circuit resistance of pretensioner squib (measured per service manual): low resistance (manufacturer spec; typically a few ohms) — compare to spec
  • Continuity between pretensioner connector and SRS module pins: near zero ohms (per spec)
  • Insulation resistance to ground: should be very high (open) — no shorts

Diagnostic algorithm

  1. Read and record all SRS codes with a capable scan tool. Note any crash/deployment history. Do not clear codes yet.
  2. Check battery voltage and charging system. Charge or replace battery if voltage is low. Retest code conditions after stable battery.
  3. Visually inspect driver seat area: connectors, wiring harness, seat rails and pretensioner for damage, corrosion or evidence of deployment. Repair obvious damage.
  4. With ignition OFF and battery disconnected, follow manufacturer SRS safety procedures (allow capacitors to discharge for the recommended wait time) before disconnecting pretensioner connectors.
  5. Measure pretensioner resistance per service manual. If resistance is high or open, replace pretensioner assembly.
  6. With battery reconnected and ignition ON (engine OFF), backprobe the pretensioner connector and measure supply voltage and signal continuity to the SRS module. Compare voltages to battery voltage and specs.
  7. Perform wiring continuity and short-to-ground/short-to-voltage tests between pretensioner connector and SRS module pins. Repair any open/high-resistance wiring or short circuits (repair, splice, or replace as needed).
  8. Inspect and test SRS fuse/relay and supply circuits. Replace faulty fuses/relays and re-test.
  9. If wiring and pretensioner check good and low voltage persists, consider SRS control module internal fault. Follow manufacturer diagnostics for module testing/replacement.
  10. After repairs, clear codes, perform SRS system relearn if required, and verify no faults return. Confirm SRS warning light is extinguished and perform final system scan.

Likely causes

  • Damaged connector or poor pin contact at the seat pretensioner
  • High resistance in the pretensioner due to internal corrosion or partial wire break
  • Low battery or poor charging causing supply voltage below threshold
  • Short to ground on the pretensioner feed wire
  • SRS control module fault or blown fuse in the airbag supply circuit

Fault status

⚠️ Status
Stored when the SRS control module detects voltage below the expected threshold on the driver seat belt pretensioner (squib) circuit; SRS warning light may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2780 B2781 B2783 B2784 B1650
Repair manuals

Manual library for LEXUS

280

Browse 280 LEXUS manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LEXUS

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