B00C7

Code

Generic B — Body

Passenger Seat Occupant Position Sensor A

Brand: Generic

Type: B — Body

Views: UK: 28 EN: 29 RU: 19

AI status

Completed

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Page language: EN

Causes

Open or shorted wiring between sensor A and the airbag/RCM module
Corroded, loose or damaged connector at the sensor or module
Failed/passenger seat occupant position sensor (A)
Foreign object, water intrusion or contamination in the seat or sensor mat
Incorrect seat position or a mechanical problem preventing proper sensor operation
Faulty restraint control module (RCM) or software/calibration issue

Symptoms

SRS/airbag warning lamp illuminated on instrument cluster
Passenger airbag enable/disable indicator may be incorrect or inactive
Diagnostic trouble code B00C7 stored in airbag/RCM module
Possible loss of seat-based occupant classification (airbag deployment logic may change)
Intermittent lamp or fault that appears when seat is moved or passenger sits down

What to check

Read and record DTC(s) and freeze-frame data with a capable scan tool (SRS/RCM module)
Check for related SRS codes (other occupant sensor codes, communication errors)
Visually inspect passenger seat, connectors under seat, and wiring harness for damage, corrosion or loose pins
Perform wiggle test while monitoring live data to see if signal changes with seat movement
Measure reference voltage, signal voltage and ground at the sensor connector (key ON, engine OFF) per service data
Check for moisture or debris in the seat cushion/mat area

Signal parameters

Signal type: occupant position/pressure sensor (analog or resistance-based) reported to RCM
Reference voltage commonly 5 V (consult vehicle-specific service data)
Typical signal voltage range (generic): ~0.5–4.5 V depending on occupant position/weight; open-circuit or 4.8 V indicate fault
Resistance-based mats: expect a measurable resistance that changes with load; open or infinite resistance indicates open circuit
Fault detection: rapid/no change in signal when loading/unloading, out-of-range voltage, or intermittent loss of signal

Diagnostic algorithm

Safety first: follow manufacturer SRS service procedures before working on seat/airbag components (disable battery/ignition as required).
Connect a diagnostic scan tool capable of reading the SRS/RCM module. Record all related codes and freeze-frame data.
Inspect the passenger seat area visually: connectors under seat, wiring along seat rails, and seat cushion for contamination or damage.
With connector accessible, check for loose pins, corrosion, bent terminals and secure mating. Re-seat connectors.
With key ON (do not deploy airbags), monitor live data/parameters for the occupant position sensor while moving the seat and while applying and removing weight to the seat. Note expected changes.
Measure reference voltage, signal voltage, and ground at the sensor connector per vehicle specifications. Compare readings to expected ranges.
If signal is out of range or intermittent, perform continuity/insulation check of wiring from sensor to RCM (pin-to-pin). Repair any broken/chafed wiring or poor grounds.
If wiring and connectors are good but sensor output remains incorrect, replace the occupant position sensor/mat (or sensor assembly) following the manufacturer procedure.
After repair or replacement, clear codes, perform any required occupant sensor calibration/relearn per service manual, then verify with scan tool and test with occupant load scenarios.
If fault persists after sensor replacement and wiring verified, consider RCM/software faults and consult dealer-level diagnostics or module reprogramming.

Likely causes

Damaged or disconnected sensor connector
Wiring harness chafe or broken conductor in seat area
Failed occupant detection sensor/mat
Contamination or water damage to sensor or mat

Fault status

⚠️ Status

Fault reported for Passenger Seat Occupant Position Sensor A circuit — signal invalid, out of range, open or short detected by restraint control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours