B2932

Code

Generic B — Body

Seat Occupant Detection Circuit Fault

Brand: Generic

Type: B — Body

Views: UK: 12 EN: 27 RU: 23

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Use a diagnostic scan tool to read DTCs and freeze frame data; note whether the code is persistent or intermittent
Check for related SRS or seat-belt DTCs
Visually inspect seat, connectors, and wiring harness under seat for damage, corrosion or foreign material
Check for signs of liquid ingress or aftermarket seat covers/pads that might interfere
Wiggle the harness/connectors with ignition on while watching live data to reproduce intermittent faults
Measure continuity and resistance of the occupant sensor mat per manufacturer procedure

Sensor type: typically resistive/pressure mat or capacitive pad; output is a resistance or capacitance change interpreted by seat module
Reference supply: most sensor circuits use a regulated reference (commonly 5 V) and return a variable signal to module (check vehicle spec)
Open-circuit condition: very high resistance or no signal (often >100 kΩ)
Short condition: near 0 Ω or a constant voltage indicating short to ground/voltage
Communications: some systems report occupancy status over LIN or CAN bus as OCCUPIED / UNOCCUPIED signals

Read and record DTCs and freeze frame with a capable scan tool. Note related SRS and body module codes.
Clear the code, cycle ignition, and see if B2932 returns or is intermittent.
Visually inspect the seat area: remove trim as needed, look for loose connectors, pinched wires, corrosion, stains or aftermarket covers.
With ignition on, monitor live data/occupant status while carefully wiggling harnesses, connectors and moving the seat to attempt to reproduce the fault.
Identify occupant sensor mat connector pins and measure resistance/continuity between mat terminals and module — compare to manufacturer values. Check for short to ground or battery.
If mat wiring is open or shorted, repair harness and retest. If intermittent, repair/replace damaged connector or wiring and secure harness away from moving parts.
If wiring and connectors are good, bench-test or replace the seat occupancy sensor (mat) per OEM procedure.
If sensor replacement does not clear the fault, test or replace the occupant detection/seat module and verify communication with SRS control unit; consult manufacturer for module programming/calibration.
After repair, perform any required occupant system calibration or SRS self-tests, then clear codes and road/test to confirm the fault is resolved.
If faults persist, consult manufacturer technical service bulletins and consider SRS control unit diagnosis by a trained technician.