B0207 – Seat Position Sensor Circuit/Open (Driver)

System: Body | Standard: ISO/SAE Controlled | Fault type: Circuit/Open

Definition source: SAE J2012/J2012DA (industry standard)

DTC B0207 indicates the driver seat position sensor circuit is detected as open by a body-related control module. An “open” fault means the module is not seeing an expected electrical path in the sensor circuit, which can be caused by an unplugged connector, broken conductor, poor terminal contact, or internal sensor/circuit failure. Because seat position sensing is used differently depending on vehicle design, the exact monitoring logic, related features, and where the sensor is physically located can vary by vehicle. Always confirm connector views, pinouts, circuit routing, and test procedures using the appropriate service information before probing or replacing components.

What Does B0207 Mean?

B0207 – Seat Position Sensor Circuit/Open (Driver) means the control module has detected an open-circuit condition in the driver seat position sensor circuit. In SAE J2012 terms, this is a circuit integrity fault, not a range/performance issue and not a “high” or “low” input condition. The module expects to see a valid electrical path for the driver seat position sensor signal and its supporting circuits (such as reference and return, depending on design). When that path is broken or the connection quality is poor enough to behave like a disconnection, the module flags the circuit as open and stores B0207.

Quick Reference

• Subsystem: Driver seat position sensor circuit (seat position sensing input to a body-related control module).
• Common triggers: Unplugged connector, broken wire in seat track harness, backed-out terminal, poor pin fit, or corrosion creating an open path.
• Likely root-cause buckets: Wiring/connector faults; sensor/internal circuit fault; power/ground/return path issue (as applicable); module input fault (less common).
• Severity: Usually no immediate driveability concern, but seat-related features that depend on position input may be limited or disabled; safety-related functions vary by vehicle.
• First checks: Verify connectors are fully seated, inspect harness routing at the seat base/track, check for pulled pins, and look for damage from seat movement.
• Common mistakes: Replacing the sensor without verifying the open is in the harness or terminals; skipping under-seat connector inspection; overlooking intermittent opens caused by seat adjustment.

Theory of Operation

The driver seat position sensor provides the module with seat position information through an electrical circuit that may use a variable resistance element, a position switch network, or another sensor style depending on vehicle design. The module supplies and monitors the circuit through one or more wires (often including a sensor feed/reference and a return/signal path). As the seat moves, the sensor changes the electrical characteristics of the circuit, allowing the module to interpret position.

For an open-circuit monitor, the module looks for evidence that the circuit is connected and responsive. If the signal path becomes disconnected (physically open) or connection quality degrades enough to behave like an open, the input can become implausible or unresponsive. After the condition is detected for a calibrated period (varies by vehicle), the module stores B0207 and may disable or substitute seat position information.

Symptoms

• Warning message: A body system warning or stored fault code related to seat position sensing.
• Feature limitation: Seat-related functions that depend on position input may be disabled or operate in a default mode (varies by vehicle).
• Intermittent operation: Symptoms may appear only when the seat is moved or when the harness is disturbed.
• Memory behavior: Seat memory/position-dependent features may not behave as expected if they use the position signal (varies by vehicle).
• No obvious change: In some vehicles there may be no noticeable symptom beyond the stored DTC.
• Recurrent code: The code may reset quickly after clearing if the open circuit is still present.

Common Causes

• Driver seat position sensor connector unplugged, partially seated, or poor terminal pin fit (open circuit condition)
• Open in the sensor signal circuit between the seat position sensor and the controlling module (broken conductor, pulled wire, damaged splice)
• Open in the sensor reference feed circuit to the seat position sensor (loss of sensor supply due to wiring/connector fault)
• Open in the sensor ground/return circuit (broken ground lead, loose ground point, terminal spread)
• Connector or terminal damage at the sensor or module (bent pins, backed-out terminals, corrosion causing loss of continuity)
• Harness damage in high-movement areas under/near the driver seat (chafing, pinch points, strain from seat travel leading to an open)
• Internal failure of the driver seat position sensor resulting in an open circuit
• Controlling module internal fault or connector issue (less common; verify all circuits before condemning a module)

Diagnosis Steps

Tools typically needed include a scan tool with body module access and live data, a digital multimeter, and wiring diagrams/service information for connector pinouts and circuit routing (varies by vehicle). A back-probing method, terminal test tools, and basic hand tools help for connector inspection and harness checks. If available, use a breakout lead or test harness to avoid damaging terminals during measurements.

1. Confirm the DTC and context. Perform a full scan and record stored and pending codes, freeze-frame or event data (if provided), and which module reported B0207. Note any related body or restraint-related codes that may share the same seat harness routing or power/ground feeds.
2. Verify the concern with live data. Locate the driver seat position sensor parameter(s) in live data (naming varies by vehicle) and observe whether the value is missing, fixed, or clearly invalid. If the scan tool shows a status such as “open circuit,” “not available,” or “fault,” document it before disturbing wiring.
3. Perform a careful visual inspection under the driver seat. With the ignition in the appropriate state per service information, inspect the sensor area, seat track, and harness routing for pinched wires, abrasion, stretched sections, or signs the harness has been tugged. Look for connectors that may have been disturbed by seat movement or prior service.
4. Check connector seating and terminal condition. Disconnect and inspect the driver seat position sensor connector and the corresponding module-side connector (as applicable). Look for backed-out terminals, bent pins, poor pin tension, corrosion, or damaged seals. Reseat connectors fully and ensure any secondary locks are engaged.
5. Wiggle test while monitoring live data. Reconnect components, then monitor the seat position sensor signal on the scan tool while gently moving the harness at key points (near the seat base, along the floor routing, and near connectors). If the reading drops out or the DTC resets during manipulation, isolate the exact section that triggers the open.
6. Check for opens with continuity testing (power off as required). Follow service information for safe power-down and connector disconnect procedures. Measure continuity of the sensor signal circuit end-to-end between the sensor connector and the module connector. Repeat for the sensor reference feed and sensor ground/return circuits. An open or unstable reading indicates a wiring/terminal issue in that circuit.
7. Use voltage-drop testing to find high-resistance opens. If continuity appears borderline or intermittent, perform voltage-drop testing across suspect connectors, splices, and ground points while the circuit is loaded (method varies by vehicle design and access). Excessive drop or a reading that changes during harness movement points to a poor connection or failing terminal that can behave like an open.
8. Verify reference feed and ground integrity at the sensor. With the circuit powered as specified, verify the sensor has its proper reference feed and a solid ground/return at the sensor connector. If either is missing, work upstream to the next accessible connector, splice, or ground point to locate where the circuit opens.
9. Evaluate the sensor only after circuit checks pass. If reference feed and ground are present and stable and the signal circuit has verified integrity to the module, then suspect an internal open in the driver seat position sensor. Confirm by following service information for sensor-specific checks or substitution where appropriate.
10. Confirm the repair. After repairs, clear codes and run the relevant monitor or perform the specified functional check. Move the seat through its full travel range while logging live data to ensure the signal remains stable. Re-scan to verify B0207 does not return and that no new related codes were introduced.

Professional tip: Intermittent opens under seats are often caused by terminal tension problems rather than a visibly broken wire. If the fault responds to a wiggle test, focus on connector pin fit, backed-out terminals, and harness strain relief points, then confirm with continuity checks performed while gently flexing the harness to reproduce the dropout.

Possible Fixes & Repair Costs

Repair cost for B0207 varies widely by vehicle and depends on what testing finds (open circuit location), parts required, and labor time for seat access and harness repair. Confirm the fault with diagnostics before replacing components.

• Reseat and secure the driver seat position sensor connector(s); verify full terminal engagement and correct locking
• Repair an open in the driver seat position sensor signal circuit (broken conductor, pulled wire, damaged insulation)
• Repair poor pin fit/corrosion at terminals; clean/replace terminals as needed and apply proper terminal tensioning procedures
• Repair or restore required power feed and ground for the seat position sensor circuit after verifying an open on the feed/return path
• Replace the driver seat position sensor only after confirming the sensor is not passing continuity/output due to an internal open (varies by vehicle design)
• Repair harness routing/strain relief under the seat to prevent repeat opens from seat track movement
• If service information supports it, perform required module configuration/calibration related to seat position sensing after repair (varies by vehicle)

Can I Still Drive With B0207?

You can often drive with B0207, but treat it as a potential safety-related body fault because seat position sensing may be used by restraint or comfort functions (varies by vehicle). If you have an airbag or restraint warning, unexpected seat behavior, or any braking/steering warning lamps, do not drive until the issue is diagnosed. Avoid moving the driver seat unnecessarily until the open circuit is found and repaired.

What Happens If You Ignore B0207?

Ignoring B0207 can leave the driver seat position signal unavailable, which may disable or degrade features that rely on it (varies by vehicle). The warning indicator may remain on, additional related codes can set, and repeated seat movement can worsen the harness damage, turning an intermittent concern into a hard open that is harder to locate.

Last updated: March 14, 2026

Vehicles Commonly Affected by B0207

• Vehicles with powered driver seats and frequent seat position adjustments
• Vehicles where the seat harness routes tightly along the seat track or moving rails
• Vehicles operated in dusty or high-debris environments where under-seat connectors can become contaminated
• Vehicles with prior seat removal, interior work, or aftermarket accessory wiring routed near the seat base
• Vehicles used for delivery/fleet duty with frequent driver entry/exit and seat movement
• Vehicles with advanced occupant/seat-based features that use seat position sensing (varies by vehicle)
• Vehicles with intermittent electrical concerns due to vibration, loose terminals, or harness strain

After repairs, verify the fix by clearing the code, running a functional check through full seat travel, and confirming B0207 does not return during a short road test while logging the seat position input (if supported by the scan tool).