Code
B1415
MITSUBISHI
B — Body
F ABG(1)PS active circuit open
Views:
UK: 7
EN: 11
RU: 14
AI status
Completed
Completed
100%
Causes
- Disconnected or loose connector under the passenger seat
- Broken, chafed or pinched wiring harness to the passenger seat sensor
- Corroded connector terminals or water intrusion
- Faulty passenger-seat occupant classification/pressure sensor module
- Faulty SRS/airbag control module (rare)
- Poor ground or reference voltage supply to the sensor
Symptoms
- SRS / airbag warning lamp illuminated or flashing
- Passenger airbag may be disabled or passenger-airbag status indicator incorrect
- Occupant detection (passenger airbag on/off) may not function or behave incorrectly
- Related fault codes stored in SRS module
- Possible inability to clear the code without repair
What to check
- Read and record all stored SRS codes and freeze-frame data with a proper scan tool
- Visually inspect the passenger seat connectors and wiring harness for damage, corrosion, or disconnection
- Check connector seating and retention clips under the passenger seat (move seat through full travel to expose harness)
- Perform wiggle test on harness while monitoring live data for the occupant sensor
- Measure reference voltage (typically 5 V reference) and ground at the sensor connector with ignition ON (follow manufacturer safety procedure)
- Measure signal voltage or resistance of the occupant sensor and compare to expected range or between left/right sensor circuits if available
Signal parameters
- Reference supply: typically a regulated reference (commonly ≈5 V) supplied from the SRS module — should be stable with ignition ON
- Signal voltage: varies with occupant sensor type; often ranges between approx. 0.5–4.5 V when loaded — an open circuit will read OL or near 0 V (or floating)
- Ground: low resistance to chassis ground (< a few ohms)
- Open-circuit indication: infinite resistance / OL when measuring continuity from sensor signal/return to the SRS module
Diagnostic algorithm
- Read and document current SRS codes and freeze frame data with a capable scan tool. Note passenger status/data if available.
- With ignition OFF and battery negative disconnected per safety procedure, move the passenger seat to access under-seat connectors. Reconnect battery only when measuring live voltages as needed and follow SRS safety precautions.
- Visually inspect and reseat all connectors under the passenger seat. Look for foreign debris, corrosion, bent pins, or damaged locks.
- Reconnect battery, turn ignition to ON (do not start). Using a multimeter and the scan tool, check for the sensor reference voltage and ground at the sensor connector. Verify presence and stability of reference voltage.
- With scan tool monitoring the occupant sensor data (live data), perform a wiggle test of the harness and connectors while watching for changes or for the code to set/clear.
- If reference voltage and ground are present but the signal is open or out of range, measure continuity between the sensor connector and the SRS control module connector to locate an open in the harness.
- If continuity and voltages to the module are good, measure the sensor resistance (with ignition OFF) or consult manufacturer data — replace the occupant classification/pressure sensor module if it shows open or out-of-spec values.
- Repair any damaged wiring or connectors (repair, solder, or replace harness sections and use proper insulation and strain relief). Replace sensor module if faulty.
- After repair, clear codes with the scan tool and perform any manufacturer-required calibration or initialization procedures for the occupant classification system. Verify the SRS warning light extinguishes and codes do not return.
- If code persists after wiring and sensor replacement, consider testing/replacing the SRS control module or consult manufacturer technical service information for module-level diagnostics.
Likely causes
- Connector under passenger seat unplugged after service or seat removal
- Wiring damaged by seat movement (rails, recliner mechanism) causing open circuit
- Sensor module failed internally (open element)
- Corrosion at connector causing intermittent/open contact
Fault status
Status
Open circuit detected in front passenger (PS active) occupant/airbag sensor circuit — signal missing or open. SRS system may disable passenger airbag until repaired.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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