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Home / DTC / B1516 — Driver seat occupied switch circuit open

B1516 — Driver seat occupied switch circuit open

Detailed page for trouble code B1516.

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Code

B1516

ALFA ROMEO B — Body

Driver seat occupied switch circuit open

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

Causes

  • Open or broken wiring in the occupant detection/switch circuit
  • Corroded, loose or contaminated connector at the seat switch or module
  • Failed/defective seat occupied (occupant detection) switch or sensor assembly
  • Faulty body control module, SRS/airbag module or poor ground at module
  • Water/moisture or intrusion in seat harness, connector or switch

Symptoms

  • Occupant detection indicator may show no occupant or incorrect occupant status
  • SRS/airbag warning lamp or diagnostic light illuminated
  • Seatbelt warning or chime may behave incorrectly for driver seat
  • Possible disablement or changed deployment logic for passenger/driver restraints
  • Stored B1516 code in SRS/BCM memory

What to check

  • Retrieve full DTC list and freeze frame data with a capable diagnostic scanner (SRS/BCM)
  • Visually inspect seat area, connector(s) under the seat and harness for damage, corrosion or moisture
  • Check for aftermarket seat heaters, alarms or wiring that may have been spliced into the harness
  • Backprobe the seat occupied switch connector with key ON and compare to expected signal/reference/ground
  • Perform continuity check between switch connector and module connector with seat in multiple positions
  • Wiggle test wiring and connector while monitoring live data or continuity to try to reproduce the fault

Signal parameters

  • Exact voltages/resistances are manufacturer-specific — consult the Alfa Romeo repair manual.
  • Typical behavior: closed switch/occupied condition often shows a low resistance to ground or a low voltage on the signal circuit; open circuit/empty condition often shows very high resistance (OL) or signal pulled to supply (reference) voltage via pull-up.
  • Expected resistance: closed ≈ near 0–50 ohms across switch contacts (if mechanical), open ≈ OL/infinite. (Verify with service data.)
  • Expected signal voltage with key ON: many systems use a 5 V or 12 V reference; open-circuit may read reference voltage, closed may read near 0–1 V. Confirm exact values in vehicle documentation.

Diagnostic algorithm

  1. Read and record all SRS/BCM codes and freeze frame using a diagnostic scanner; note related codes.
  2. Visually inspect connectors and harness under the driver seat for damage, contamination, or foreign objects. Repair any visible damage.
  3. Follow manufacturer SRS safety procedures before doing hands-on work (disable battery/power and wait required time per service manual).
  4. Backprobe the seat occupied switch connector with key ON (and SRS enabled as required by procedure) and measure signal voltage and reference/ground per service data. Compare to expected values.
  5. If open circuit suspected, perform continuity test between switch connector and control module connector pins. Move seat through full travel while monitoring continuity.
  6. If wiring is intact, disconnect the switch and measure switch resistance across its terminals with seat occupied/unoccupied. Replace switch if it does not change as specified.
  7. If wiring or connector is faulty, repair wiring or replace connector pins as needed, then re-test.
  8. After repairs, clear codes and perform an SRS system scan and live-data verification. Confirm code does not return and that occupant detection behaves correctly.
  9. If codes persist after wiring and switch checks, consider module diagnostics/replacement per manufacturer procedure and consult technical service bulletins.

Likely causes

  • Damaged seat harness from seat adjustment mechanism
  • Connector pins pushed out or bent at the seat module or under-seat harness
  • Seat switch internal failure from wear or contamination
  • Chafed wiring that opens when seat is adjusted
  • Corrosion from spilled liquids in seat area

Fault status

⚠️ Status
Driver seat occupied switch circuit open — open circuit detected in the driver seat occupant detection/switch wiring or switch. Inspect connectors, wiring and switch.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1502 B1517 B1620 B1627
89

Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

B1516

FIAT B — Body

Driver seat occupied switch circuit open

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

Causes

  • Open or broken wiring in the occupant detection/switch circuit
  • Corroded, loose or contaminated connector at the seat switch or module
  • Failed/defective seat occupied (occupant detection) switch or sensor assembly
  • Faulty body control module, SRS/airbag module or poor ground at module
  • Water/moisture or intrusion in seat harness, connector or switch

Symptoms

  • Occupant detection indicator may show no occupant or incorrect occupant status
  • SRS/airbag warning lamp or diagnostic light illuminated
  • Seatbelt warning or chime may behave incorrectly for driver seat
  • Possible disablement or changed deployment logic for passenger/driver restraints
  • Stored B1516 code in SRS/BCM memory

What to check

  • Retrieve full DTC list and freeze frame data with a capable diagnostic scanner (SRS/BCM)
  • Visually inspect seat area, connector(s) under the seat and harness for damage, corrosion or moisture
  • Check for aftermarket seat heaters, alarms or wiring that may have been spliced into the harness
  • Backprobe the seat occupied switch connector with key ON and compare to expected signal/reference/ground
  • Perform continuity check between switch connector and module connector with seat in multiple positions
  • Wiggle test wiring and connector while monitoring live data or continuity to try to reproduce the fault

Signal parameters

  • Exact voltages/resistances are manufacturer-specific — consult the Alfa Romeo repair manual.
  • Typical behavior: closed switch/occupied condition often shows a low resistance to ground or a low voltage on the signal circuit; open circuit/empty condition often shows very high resistance (OL) or signal pulled to supply (reference) voltage via pull-up.
  • Expected resistance: closed ≈ near 0–50 ohms across switch contacts (if mechanical), open ≈ OL/infinite. (Verify with service data.)
  • Expected signal voltage with key ON: many systems use a 5 V or 12 V reference; open-circuit may read reference voltage, closed may read near 0–1 V. Confirm exact values in vehicle documentation.

Diagnostic algorithm

  1. Read and record all SRS/BCM codes and freeze frame using a diagnostic scanner; note related codes.
  2. Visually inspect connectors and harness under the driver seat for damage, contamination, or foreign objects. Repair any visible damage.
  3. Follow manufacturer SRS safety procedures before doing hands-on work (disable battery/power and wait required time per service manual).
  4. Backprobe the seat occupied switch connector with key ON (and SRS enabled as required by procedure) and measure signal voltage and reference/ground per service data. Compare to expected values.
  5. If open circuit suspected, perform continuity test between switch connector and control module connector pins. Move seat through full travel while monitoring continuity.
  6. If wiring is intact, disconnect the switch and measure switch resistance across its terminals with seat occupied/unoccupied. Replace switch if it does not change as specified.
  7. If wiring or connector is faulty, repair wiring or replace connector pins as needed, then re-test.
  8. After repairs, clear codes and perform an SRS system scan and live-data verification. Confirm code does not return and that occupant detection behaves correctly.
  9. If codes persist after wiring and switch checks, consider module diagnostics/replacement per manufacturer procedure and consult technical service bulletins.

Likely causes

  • Damaged seat harness from seat adjustment mechanism
  • Connector pins pushed out or bent at the seat module or under-seat harness
  • Seat switch internal failure from wear or contamination
  • Chafed wiring that opens when seat is adjusted
  • Corrosion from spilled liquids in seat area

Fault status

⚠️ Status
Driver seat occupied switch circuit open — open circuit detected in the driver seat occupant detection/switch wiring or switch. Inspect connectors, wiring and switch.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1502 B1517 B1620 B1627
Repair manuals

Manual library for FIAT

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Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

B1516

MITSUBISHI B — Body

PS.seat position SW open

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

Causes

  • Open or broken wiring in the occupant detection/switch circuit
  • Corroded, loose or contaminated connector at the seat switch or module
  • Failed/defective seat occupied (occupant detection) switch or sensor assembly
  • Faulty body control module, SRS/airbag module or poor ground at module
  • Water/moisture or intrusion in seat harness, connector or switch

Symptoms

  • Occupant detection indicator may show no occupant or incorrect occupant status
  • SRS/airbag warning lamp or diagnostic light illuminated
  • Seatbelt warning or chime may behave incorrectly for driver seat
  • Possible disablement or changed deployment logic for passenger/driver restraints
  • Stored B1516 code in SRS/BCM memory

What to check

  • Retrieve full DTC list and freeze frame data with a capable diagnostic scanner (SRS/BCM)
  • Visually inspect seat area, connector(s) under the seat and harness for damage, corrosion or moisture
  • Check for aftermarket seat heaters, alarms or wiring that may have been spliced into the harness
  • Backprobe the seat occupied switch connector with key ON and compare to expected signal/reference/ground
  • Perform continuity check between switch connector and module connector with seat in multiple positions
  • Wiggle test wiring and connector while monitoring live data or continuity to try to reproduce the fault

Signal parameters

  • Exact voltages/resistances are manufacturer-specific — consult the Alfa Romeo repair manual.
  • Typical behavior: closed switch/occupied condition often shows a low resistance to ground or a low voltage on the signal circuit; open circuit/empty condition often shows very high resistance (OL) or signal pulled to supply (reference) voltage via pull-up.
  • Expected resistance: closed ≈ near 0–50 ohms across switch contacts (if mechanical), open ≈ OL/infinite. (Verify with service data.)
  • Expected signal voltage with key ON: many systems use a 5 V or 12 V reference; open-circuit may read reference voltage, closed may read near 0–1 V. Confirm exact values in vehicle documentation.

Diagnostic algorithm

  1. Read and record all SRS/BCM codes and freeze frame using a diagnostic scanner; note related codes.
  2. Visually inspect connectors and harness under the driver seat for damage, contamination, or foreign objects. Repair any visible damage.
  3. Follow manufacturer SRS safety procedures before doing hands-on work (disable battery/power and wait required time per service manual).
  4. Backprobe the seat occupied switch connector with key ON (and SRS enabled as required by procedure) and measure signal voltage and reference/ground per service data. Compare to expected values.
  5. If open circuit suspected, perform continuity test between switch connector and control module connector pins. Move seat through full travel while monitoring continuity.
  6. If wiring is intact, disconnect the switch and measure switch resistance across its terminals with seat occupied/unoccupied. Replace switch if it does not change as specified.
  7. If wiring or connector is faulty, repair wiring or replace connector pins as needed, then re-test.
  8. After repairs, clear codes and perform an SRS system scan and live-data verification. Confirm code does not return and that occupant detection behaves correctly.
  9. If codes persist after wiring and switch checks, consider module diagnostics/replacement per manufacturer procedure and consult technical service bulletins.

Likely causes

  • Damaged seat harness from seat adjustment mechanism
  • Connector pins pushed out or bent at the seat module or under-seat harness
  • Seat switch internal failure from wear or contamination
  • Chafed wiring that opens when seat is adjusted
  • Corrosion from spilled liquids in seat area

Fault status

⚠️ Status
Driver seat occupied switch circuit open — open circuit detected in the driver seat occupant detection/switch wiring or switch. Inspect connectors, wiring and switch.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1502 B1517 B1620 B1627
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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

B1516

Other B — Body

Seat Driver Occupied Switch Circuit Open

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

Causes

  • Open or broken wiring in the occupant detection/switch circuit
  • Corroded, loose or contaminated connector at the seat switch or module
  • Failed/defective seat occupied (occupant detection) switch or sensor assembly
  • Faulty body control module, SRS/airbag module or poor ground at module
  • Water/moisture or intrusion in seat harness, connector or switch

Symptoms

  • Occupant detection indicator may show no occupant or incorrect occupant status
  • SRS/airbag warning lamp or diagnostic light illuminated
  • Seatbelt warning or chime may behave incorrectly for driver seat
  • Possible disablement or changed deployment logic for passenger/driver restraints
  • Stored B1516 code in SRS/BCM memory

What to check

  • Retrieve full DTC list and freeze frame data with a capable diagnostic scanner (SRS/BCM)
  • Visually inspect seat area, connector(s) under the seat and harness for damage, corrosion or moisture
  • Check for aftermarket seat heaters, alarms or wiring that may have been spliced into the harness
  • Backprobe the seat occupied switch connector with key ON and compare to expected signal/reference/ground
  • Perform continuity check between switch connector and module connector with seat in multiple positions
  • Wiggle test wiring and connector while monitoring live data or continuity to try to reproduce the fault

Signal parameters

  • Exact voltages/resistances are manufacturer-specific — consult the Alfa Romeo repair manual.
  • Typical behavior: closed switch/occupied condition often shows a low resistance to ground or a low voltage on the signal circuit; open circuit/empty condition often shows very high resistance (OL) or signal pulled to supply (reference) voltage via pull-up.
  • Expected resistance: closed ≈ near 0–50 ohms across switch contacts (if mechanical), open ≈ OL/infinite. (Verify with service data.)
  • Expected signal voltage with key ON: many systems use a 5 V or 12 V reference; open-circuit may read reference voltage, closed may read near 0–1 V. Confirm exact values in vehicle documentation.

Diagnostic algorithm

  1. Read and record all SRS/BCM codes and freeze frame using a diagnostic scanner; note related codes.
  2. Visually inspect connectors and harness under the driver seat for damage, contamination, or foreign objects. Repair any visible damage.
  3. Follow manufacturer SRS safety procedures before doing hands-on work (disable battery/power and wait required time per service manual).
  4. Backprobe the seat occupied switch connector with key ON (and SRS enabled as required by procedure) and measure signal voltage and reference/ground per service data. Compare to expected values.
  5. If open circuit suspected, perform continuity test between switch connector and control module connector pins. Move seat through full travel while monitoring continuity.
  6. If wiring is intact, disconnect the switch and measure switch resistance across its terminals with seat occupied/unoccupied. Replace switch if it does not change as specified.
  7. If wiring or connector is faulty, repair wiring or replace connector pins as needed, then re-test.
  8. After repairs, clear codes and perform an SRS system scan and live-data verification. Confirm code does not return and that occupant detection behaves correctly.
  9. If codes persist after wiring and switch checks, consider module diagnostics/replacement per manufacturer procedure and consult technical service bulletins.

Likely causes

  • Damaged seat harness from seat adjustment mechanism
  • Connector pins pushed out or bent at the seat module or under-seat harness
  • Seat switch internal failure from wear or contamination
  • Chafed wiring that opens when seat is adjusted
  • Corrosion from spilled liquids in seat area

Fault status

⚠️ Status
Driver seat occupied switch circuit open — open circuit detected in the driver seat occupant detection/switch wiring or switch. Inspect connectors, wiring and switch.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1502 B1517 B1620 B1627
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