Code
B1517
ALFA ROMEO
B — Body
Driver seat occupied switch circuit short to positive
Views:
UK: 4
EN: 5
RU: 2
AI status
Completed
Completed
100%
Causes
- Short to battery voltage in the occupant switch wiring (pinched/chafed wire contacting constant +12V)
- Corroded or damaged seat connector or terminals allowing unintended positive contact
- Faulty/failed driver seat occupied switch (internal short)
- Aftermarket seat heater/aux wiring incorrectly tied into occupant circuit
- Poor or missing ground at seat wiring causing abnormal voltage reference
- Water/moisture ingress in the seat connector assembly
Symptoms
- Airbag/SRS warning lamp or occupant classification warning illuminated
- Seat occupant indicator or passenger airbag enable/disable status incorrect
- Seat belt reminder may behave incorrectly for driver
- Diagnostic trouble code B1517 stored in memory
- Possible intermittent detection of occupant presence depending on wiring movement
What to check
- Read and record trouble codes and freeze-frame data with a scan tool
- Inspect driver seat wiring harness, connectors and loom for damage, chafe, corrosion or signs of aftermarket splices
- Visually inspect seat rail area and under-seat components for pinched wires or crushed harness
- With ignition ON, monitor the occupant switch signal in live data to see if it reads constant positive
- Wiggle test wiring while observing live data for intermittent changes
- Disconnect aftermarket accessories (seat heaters, amplifiers) and re-check
Signal parameters
- Typical expected: logic input should switch between near 0 V (ground) and battery voltage depending on design — ECU normally expects a clean switched signal, not a permanent battery voltage
- Fault condition: persistent ~12 V on the occupant input (short to positive)
- Switch resistance: closed to ground typically 10 kΩ (varies by manufacturer)
- Note: exact voltages and resistance ranges depend on model year and module design; consult factory wiring diagram for nominal values
Diagnostic algorithm
- Use a scan tool: confirm B1517 presence, note any related occupant/SRS codes, and capture live data for the driver seat occupied input.
- Perform a visual inspection of the driver seat harness, connectors (under-seat and at B-pillar), and seat rail area for damage, corrosion or aftermarket splices. Repair any obvious wiring damage.
- With ignition ON (engine off), backprobing the occupant switch connector: measure voltage at the signal pin to ground. If it reads ~12 V continuously, the short to positive condition is present.
- Disconnect the occupant switch connector at the seat. If the ECU input now changes (or returns to expected idle voltage), suspect the switch or seat-side wiring. If the input still reads battery voltage with the switch disconnected, the short is upstream in the harness or at a splice/other device.
- Perform continuity tests: check for unintended continuity between the occupant signal wire and battery positive with multimeter (key off). Repair any shorted sections found.
- Wiggle harness and move seat through full travel while monitoring the signal to reproduce intermittent faults; repair chafing or secure harness away from moving components.
- If wiring and switch test good, test/replace the seat occupied switch assembly following SRS precautions, or trace to/replace the controlling module if internal short is suspected (consult factory procedure).
- After repairs, clear codes and verify the system returns to normal in live data and on road test.
- Safety note: the occupant classification system is part of the SRS/airbag system. Observe proper safety procedures (battery disconnect wait times and OEM service manual instructions) when working on or near airbags.
Likely causes
- Wiring chafe under seat contacting constant +12V source
- Damaged connector terminal or bent pin making contact with positive circuit
- Failed occupant detection switch inside the seat
- Aftermarket installation (heater, audio, alarm) accidentally connected to occupant circuit
Fault status
Status
B1517 — Driver seat occupied switch circuit short to positive (unexpected battery voltage on occupant detection input).
Repair difficulty: Medium
Diagnostic time: 0.5 - 3.0 hours
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Code
B1517
FIAT
B — Body
Driver seat occupied switch circuit short to positive
Views:
UK: 3
EN: 5
RU: 2
AI status
Completed
Completed
100%
Causes
- Short to battery voltage in the occupant switch wiring (pinched/chafed wire contacting constant +12V)
- Corroded or damaged seat connector or terminals allowing unintended positive contact
- Faulty/failed driver seat occupied switch (internal short)
- Aftermarket seat heater/aux wiring incorrectly tied into occupant circuit
- Poor or missing ground at seat wiring causing abnormal voltage reference
- Water/moisture ingress in the seat connector assembly
Symptoms
- Airbag/SRS warning lamp or occupant classification warning illuminated
- Seat occupant indicator or passenger airbag enable/disable status incorrect
- Seat belt reminder may behave incorrectly for driver
- Diagnostic trouble code B1517 stored in memory
- Possible intermittent detection of occupant presence depending on wiring movement
What to check
- Read and record trouble codes and freeze-frame data with a scan tool
- Inspect driver seat wiring harness, connectors and loom for damage, chafe, corrosion or signs of aftermarket splices
- Visually inspect seat rail area and under-seat components for pinched wires or crushed harness
- With ignition ON, monitor the occupant switch signal in live data to see if it reads constant positive
- Wiggle test wiring while observing live data for intermittent changes
- Disconnect aftermarket accessories (seat heaters, amplifiers) and re-check
Signal parameters
- Typical expected: logic input should switch between near 0 V (ground) and battery voltage depending on design — ECU normally expects a clean switched signal, not a permanent battery voltage
- Fault condition: persistent ~12 V on the occupant input (short to positive)
- Switch resistance: closed to ground typically 10 kΩ (varies by manufacturer)
- Note: exact voltages and resistance ranges depend on model year and module design; consult factory wiring diagram for nominal values
Diagnostic algorithm
- Use a scan tool: confirm B1517 presence, note any related occupant/SRS codes, and capture live data for the driver seat occupied input.
- Perform a visual inspection of the driver seat harness, connectors (under-seat and at B-pillar), and seat rail area for damage, corrosion or aftermarket splices. Repair any obvious wiring damage.
- With ignition ON (engine off), backprobing the occupant switch connector: measure voltage at the signal pin to ground. If it reads ~12 V continuously, the short to positive condition is present.
- Disconnect the occupant switch connector at the seat. If the ECU input now changes (or returns to expected idle voltage), suspect the switch or seat-side wiring. If the input still reads battery voltage with the switch disconnected, the short is upstream in the harness or at a splice/other device.
- Perform continuity tests: check for unintended continuity between the occupant signal wire and battery positive with multimeter (key off). Repair any shorted sections found.
- Wiggle harness and move seat through full travel while monitoring the signal to reproduce intermittent faults; repair chafing or secure harness away from moving components.
- If wiring and switch test good, test/replace the seat occupied switch assembly following SRS precautions, or trace to/replace the controlling module if internal short is suspected (consult factory procedure).
- After repairs, clear codes and verify the system returns to normal in live data and on road test.
- Safety note: the occupant classification system is part of the SRS/airbag system. Observe proper safety procedures (battery disconnect wait times and OEM service manual instructions) when working on or near airbags.
Likely causes
- Wiring chafe under seat contacting constant +12V source
- Damaged connector terminal or bent pin making contact with positive circuit
- Failed occupant detection switch inside the seat
- Aftermarket installation (heater, audio, alarm) accidentally connected to occupant circuit
Fault status
Status
B1517 — Driver seat occupied switch circuit short to positive (unexpected battery voltage on occupant detection input).
Repair difficulty: Medium
Diagnostic time: 0.5 - 3.0 hours
Similar codes
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Code
B1517
MITSUBISHI
B — Body
PS.seat position SW short to GND
Views:
UK: 7
EN: 10
RU: 8
AI status
Completed
Completed
100%
Causes
- Short to battery voltage in the occupant switch wiring (pinched/chafed wire contacting constant +12V)
- Corroded or damaged seat connector or terminals allowing unintended positive contact
- Faulty/failed driver seat occupied switch (internal short)
- Aftermarket seat heater/aux wiring incorrectly tied into occupant circuit
- Poor or missing ground at seat wiring causing abnormal voltage reference
- Water/moisture ingress in the seat connector assembly
Symptoms
- Airbag/SRS warning lamp or occupant classification warning illuminated
- Seat occupant indicator or passenger airbag enable/disable status incorrect
- Seat belt reminder may behave incorrectly for driver
- Diagnostic trouble code B1517 stored in memory
- Possible intermittent detection of occupant presence depending on wiring movement
What to check
- Read and record trouble codes and freeze-frame data with a scan tool
- Inspect driver seat wiring harness, connectors and loom for damage, chafe, corrosion or signs of aftermarket splices
- Visually inspect seat rail area and under-seat components for pinched wires or crushed harness
- With ignition ON, monitor the occupant switch signal in live data to see if it reads constant positive
- Wiggle test wiring while observing live data for intermittent changes
- Disconnect aftermarket accessories (seat heaters, amplifiers) and re-check
Signal parameters
- Typical expected: logic input should switch between near 0 V (ground) and battery voltage depending on design — ECU normally expects a clean switched signal, not a permanent battery voltage
- Fault condition: persistent ~12 V on the occupant input (short to positive)
- Switch resistance: closed to ground typically 10 kΩ (varies by manufacturer)
- Note: exact voltages and resistance ranges depend on model year and module design; consult factory wiring diagram for nominal values
Diagnostic algorithm
- Use a scan tool: confirm B1517 presence, note any related occupant/SRS codes, and capture live data for the driver seat occupied input.
- Perform a visual inspection of the driver seat harness, connectors (under-seat and at B-pillar), and seat rail area for damage, corrosion or aftermarket splices. Repair any obvious wiring damage.
- With ignition ON (engine off), backprobing the occupant switch connector: measure voltage at the signal pin to ground. If it reads ~12 V continuously, the short to positive condition is present.
- Disconnect the occupant switch connector at the seat. If the ECU input now changes (or returns to expected idle voltage), suspect the switch or seat-side wiring. If the input still reads battery voltage with the switch disconnected, the short is upstream in the harness or at a splice/other device.
- Perform continuity tests: check for unintended continuity between the occupant signal wire and battery positive with multimeter (key off). Repair any shorted sections found.
- Wiggle harness and move seat through full travel while monitoring the signal to reproduce intermittent faults; repair chafing or secure harness away from moving components.
- If wiring and switch test good, test/replace the seat occupied switch assembly following SRS precautions, or trace to/replace the controlling module if internal short is suspected (consult factory procedure).
- After repairs, clear codes and verify the system returns to normal in live data and on road test.
- Safety note: the occupant classification system is part of the SRS/airbag system. Observe proper safety procedures (battery disconnect wait times and OEM service manual instructions) when working on or near airbags.
Likely causes
- Wiring chafe under seat contacting constant +12V source
- Damaged connector terminal or bent pin making contact with positive circuit
- Failed occupant detection switch inside the seat
- Aftermarket installation (heater, audio, alarm) accidentally connected to occupant circuit
Fault status
Status
B1517 — Driver seat occupied switch circuit short to positive (unexpected battery voltage on occupant detection input).
Repair difficulty: Medium
Diagnostic time: 0.5 - 3.0 hours
Similar codes
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Code
B1517
Other
B — Body
Seat Driver Occupied Switch Circuit Short To Battery
Views:
UK: 20
EN: 27
RU: 30
AI status
Completed
Completed
100%
Causes
- Short to battery voltage in the occupant switch wiring (pinched/chafed wire contacting constant +12V)
- Corroded or damaged seat connector or terminals allowing unintended positive contact
- Faulty/failed driver seat occupied switch (internal short)
- Aftermarket seat heater/aux wiring incorrectly tied into occupant circuit
- Poor or missing ground at seat wiring causing abnormal voltage reference
- Water/moisture ingress in the seat connector assembly
Symptoms
- Airbag/SRS warning lamp or occupant classification warning illuminated
- Seat occupant indicator or passenger airbag enable/disable status incorrect
- Seat belt reminder may behave incorrectly for driver
- Diagnostic trouble code B1517 stored in memory
- Possible intermittent detection of occupant presence depending on wiring movement
What to check
- Read and record trouble codes and freeze-frame data with a scan tool
- Inspect driver seat wiring harness, connectors and loom for damage, chafe, corrosion or signs of aftermarket splices
- Visually inspect seat rail area and under-seat components for pinched wires or crushed harness
- With ignition ON, monitor the occupant switch signal in live data to see if it reads constant positive
- Wiggle test wiring while observing live data for intermittent changes
- Disconnect aftermarket accessories (seat heaters, amplifiers) and re-check
Signal parameters
- Typical expected: logic input should switch between near 0 V (ground) and battery voltage depending on design — ECU normally expects a clean switched signal, not a permanent battery voltage
- Fault condition: persistent ~12 V on the occupant input (short to positive)
- Switch resistance: closed to ground typically 10 kΩ (varies by manufacturer)
- Note: exact voltages and resistance ranges depend on model year and module design; consult factory wiring diagram for nominal values
Diagnostic algorithm
- Use a scan tool: confirm B1517 presence, note any related occupant/SRS codes, and capture live data for the driver seat occupied input.
- Perform a visual inspection of the driver seat harness, connectors (under-seat and at B-pillar), and seat rail area for damage, corrosion or aftermarket splices. Repair any obvious wiring damage.
- With ignition ON (engine off), backprobing the occupant switch connector: measure voltage at the signal pin to ground. If it reads ~12 V continuously, the short to positive condition is present.
- Disconnect the occupant switch connector at the seat. If the ECU input now changes (or returns to expected idle voltage), suspect the switch or seat-side wiring. If the input still reads battery voltage with the switch disconnected, the short is upstream in the harness or at a splice/other device.
- Perform continuity tests: check for unintended continuity between the occupant signal wire and battery positive with multimeter (key off). Repair any shorted sections found.
- Wiggle harness and move seat through full travel while monitoring the signal to reproduce intermittent faults; repair chafing or secure harness away from moving components.
- If wiring and switch test good, test/replace the seat occupied switch assembly following SRS precautions, or trace to/replace the controlling module if internal short is suspected (consult factory procedure).
- After repairs, clear codes and verify the system returns to normal in live data and on road test.
- Safety note: the occupant classification system is part of the SRS/airbag system. Observe proper safety procedures (battery disconnect wait times and OEM service manual instructions) when working on or near airbags.
Likely causes
- Wiring chafe under seat contacting constant +12V source
- Damaged connector terminal or bent pin making contact with positive circuit
- Failed occupant detection switch inside the seat
- Aftermarket installation (heater, audio, alarm) accidentally connected to occupant circuit
Fault status
Status
B1517 — Driver seat occupied switch circuit short to positive (unexpected battery voltage on occupant detection input).
Repair difficulty: Medium
Diagnostic time: 0.5 - 3.0 hours
Similar codes
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