B2674

Code

Generic B — Body

Driver Seat Position Sensor Circuit Range/Performance

Brand: Generic

Type: B — Body

Views: UK: 0 EN: 1 RU: 0

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or disconnected seat position sensor
Open, shorted, corroded, or broken wiring/harness to the sensor
Poor or corroded connector terminals at the sensor or control module
Water/moisture ingress or contamination of connector or sensor
Faulty seat position sensor (potentiometer, Hall effect, or encoder)
Fault in the seat control module or occupant classification/control module

Symptoms

SRS/airbag or seat belt warning lamp illuminated
Seat memory/position recall malfunction or inaccurate seat position reporting
Warning or fault message on dash related to occupant classification or seat adjustment
Intermittent or no response from seat position related features
Possible disablement of some airbag deployment logic or seatbelt pretensioner behavior (system dependent)

What to check

Scan vehicle with OEM-level diagnostic tool; record freeze frame and all related DTCs
Check for related codes in occupant classification, airbag (SRS), and seat modules
Visually inspect the seat harness, connector, and sensor for damage, corrosion, or contamination
Perform wiggle test on the harness while watching live data to detect intermittent changes
Measure sensor supply voltage and ground at the connector with key on (typical reference 5V or module-supplied reference)
Measure sensor output signal while moving the seat through full travel; verify smooth, continuous change without jumps or dropouts

Signal parameters

Typical sensor reference voltage: ~5 V reference (varies by manufacturer)
Typical signal range: 0–5 V analog or 0–100% position / counts for digital encoders
Expected behavior: smooth, monotonic change in signal with seat travel (no sudden steps, dropouts, or noise spikes)
Resistance sensor: variable resistance from low to high across travel (exact ohms depend on sensor type)
If bus-type sensor (CAN/LIN): valid module messages present and no communication errors

Diagnostic algorithm

Retrieve and record all DTCs and freeze-frame data using a capable scan tool; note related SRS/seat/classification codes.
Visually inspect the seat track area, sensor and connector for damage, corrosion, or foreign objects; repair obvious damage.
With ignition ON, verify sensor reference voltage and ground at the connector pins. If reference or ground missing, trace to source (module/fuse/ground).
Backprobe the sensor output pin and observe live data while moving the seat through full travel. Look for smooth change; intermittent or flat signals indicate sensor or wiring fault.
Perform a wiggle test of the wiring harness while watching signal for intermittent behavior. If intermittent, repair/replace wiring or connector.
If analog sensor, measure resistance across sensor terminals while moving seat; compare to spec or known-good part. If digital, check message counts/values on bus with scan tool.
If wiring and connector are good and signal is out of range, bench-test or replace the seat position sensor assembly.
If sensor and wiring verify good, inspect/replace or reprogram seat control/occupant classification module per manufacturer procedures and perform any required seat position calibration or learning procedure.
Clear DTCs and verify repair by cycling ignition and moving seat; confirm no reoccurrence and that related systems (airbag, seat memory) function normally.

Likely causes

Worn sensor wiper or failed potentiometer inside sensor assembly
Connector pins pushed out, bent, or corroded at the seat harness
Chafed wiring under the seat due to seat movement causing intermittent short/open
Poor ground or power supply to the sensor (low reference voltage)
Module firmware or calibration required after seat replacement or service

Fault status

⚠️ Status

Driver Seat Position Sensor Circuit Range/Performance — sensor output reading out of expected range or inconsistent; may affect occupant classification, seat memory, or airbag logic.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours