Code
B3467
HUMMER
B — Body
Passenger Seat Occupant Detection Sensor Circuit Malfunction
AI status
Completed
Completed
100%
Causes
- Open, short, or high-resistance condition in the passenger seat occupant sensor wiring
- Corroded, loose, or disconnected seat harness connector(s)
- Damaged or contaminated occupant detection mat/sensor (water, debris, wear)
- Faulty Occupant Classification Module/Restraint Control Module or related electronics
- Incorrect sensor readings after seat repair or replacement (incorrect part or connector)
- Software or calibration fault requiring module reprogramming/calibration
Symptoms
- SRS/Airbag warning lamp illuminated
- Passenger airbag status message may read 'OFF' or 'CHECK AIRBAG' incorrectly
- Passenger presence indicator behaves inconsistently (on/off with occupant movement)
- Possible disablement of passenger airbag even when seat is occupied
- Diagnostic trouble code B3467 stored in SRS/occupant restraint module
What to check
- Read SRS module for B3467 and any related DTCs; record freeze frame/live data
- Perform visual inspection of passenger seat wiring, connectors, and sensor mat for damage or contamination
- Check connector pins for corrosion, bent pins, push-back, or moisture
- Wiggle harness at seat base and track while monitoring live data to reproduce fault
- Verify reference and ground voltages at the seat sensor connector per service manual
- Check continuity and for short to ground or battery between sensor signal, reference, and ground
Signal parameters
- Reference voltage (sensor supply) typically ~5 V from the restraint control/occupant module (verify exact value in OEM manual)
- Sensor output signal will vary with occupancy; expected voltage range typically between ~0–5 V depending on design
- Open circuit: infinite resistance or no signal; short to ground: ~0 V; short to battery/5 V: fixed/stuck voltage
- Seat mat resistance usually changes measurably when occupied; expected continuity vs open depends on OEM mat design (consult service data)
- Monitor live-data passenger presence/weight parameter for stable readings when seat is unoccupied vs occupied
Diagnostic algorithm
- SAFETY: Before servicing SRS components, disable the SRS system per manufacturer procedure (usually disconnect battery negative and wait specified time). Follow all OEM warnings.
- Using a capable scan tool, read and record all SRS/occupant classification DTCs and live-data values. Clear codes and perform an initial re-check to see if code returns.
- Visually inspect the passenger seat cushion and back for signs of fluid intrusion, damage, or loose trim that could disturb the sensor mat.
- Inspect and secure the seat electrical connectors. Unplug and inspect pins for corrosion, bent pins, or contamination; reconnect and ensure full engagement.
- With ignition on (and SRS enabled only per OEM instructions), monitor the occupant sensor live values on the scan tool while performing a wiggle test on the harness, moving the seat, and simulating occupancy. Note any intermittent changes.
- Measure reference voltage, sensor signal, and ground at the seat connector per service manual. Check for continuity and shorts between signal, reference, and ground with harness disconnected.
- If wiring and connectors test good, follow OEM procedure to test the occupant detection mat (resistance/voltage or specific bench test). Replace the mat if out of specification or damaged.
- If mat and wiring are OK, suspect module-level faults. Verify occupant classification module and restraint control module operation; reprogram or replace per OEM service instructions if required.
- After repairs, clear codes and perform required occupant classification calibration/relearn procedure using the scan tool and follow OEM verification steps.
- Final road test and system check: verify SRS lamp is off and passenger occupancy status is correct for several occupancy scenarios.
Likely causes
- Seat harness crushed or chafed at seat track/hinge causing intermittent open/short
- Connector pushed back or not fully seated after seat removal
- Moisture or corrosion inside the seat cushion sensor connector or mat
- Failed occupant detection mat (age or physical damage)
- Faulty ground or reference supply to the sensor from the control module
Fault status
Status
Passenger Seat Occupant Detection Sensor Circuit Malfunction — the restraint system has detected an invalid or out-of-range signal from the passenger seat occupant detection circuit. This can affect passenger airbag enable/disable logic and will set the SRS warning lamp.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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