Code
B2583
Other
B — Body
Child Seat Detection Circuit Short to Ground
AI status
Completed
Completed
100%
Causes
- Wiring or connector insulation damaged causing conductor contact with chassis ground
- Failed occupant detection sensor (seat mat, pressure sensor, or seat module)
- Corroded or water-intruded connector
- Poor repair or aftermarket seat/cover altering sensor wiring
- Faulty restraint control module input or internal short
Symptoms
- Passenger airbag enable/disable status incorrect or flashing
- Airbag warning light or SRS message on dash
- Child/seat occupancy indicator light illuminated or unavailable
- Possible diagnostic trouble codes stored related to occupancy
- Seat belt reminder behaves incorrectly for front passenger
What to check
- Read DTCs and freeze frame data with a scan tool; note related codes
- Visually inspect seat, connectors, and harness routing under the seat
- Check for signs of water, corrosion, cuts, or pinched wires
- Wiggle test wiring while observing live data or DTC status
- Measure signal and reference voltages at the occupant sensor connector
- Perform continuity checks from signal conductor to chassis ground
Signal parameters
- Reference supply usually ~5 V (varies by manufacturer) — verify with OEM specs
- Normal sensor signal varies between low and high depending on occupancy (0–5 V range typical)
- Short-to-ground condition: signal voltage near 0 V (
- Open-circuit: signal may float or read erratic; check for high resistance
- Ground continuity for a true short: very low resistance (
Diagnostic algorithm
- Retrieve and record B2583 plus any related codes and freeze frame data with a scan tool.
- Follow OEM SRS safety procedures (disconnect battery and wait recommended time) before touching connectors or seat components.
- Perform a visual inspection of the passenger seat, seat upholstery, and underside for water, foreign objects, or damage to the sensor mat and wiring.
- Inspect and unplug the occupancy sensor/seat harness connector. Look for corrosion, bent pins, or contamination.
- With connector unplugged, measure resistance from the sensor signal wire to chassis ground. A near-zero reading indicates a short to ground at or before the connector.
- If no short at the connector, trace the harness toward the restraint control module. Use back-probing or disconnect points to isolate which section has the short (divide and conquer).
- Repair damaged wiring: replace or splice using OEM-quality parts, insulate and secure harness away from sharp edges and moving parts.
- If wiring checks good, bench-test or replace the occupant detection sensor/mat per OEM procedure.
- If wiring and sensor are good, check the restraint control/airbag module input circuit; replace module only if confirmed faulty per OEM diagnostics.
- After repairs, reconnect, clear codes, reconnect battery, and verify system operation and that B2583 does not return under normal conditions.
Likely causes
- Pin pushed through connector, contacting seat frame or body
- Broken wire rubbed through under seat into metal
- Moisture inside seat cushion or connector creating conductive path
- Seat occupancy sensor element shorted internally
- Incorrectly reinstalled seat harness after service
Fault status
Status
Child seat detection circuit — short to ground detected on occupant sensor input
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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