B1517

Code

Other B — Body

Seat Driver Occupied Switch Circuit Short To Battery

Brand: Other

Type: B — Body

Views: UK: 31 EN: 39 RU: 40

AI status

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Page language: EN

Causes

Short circuit in the driver seat occupied switch wiring to battery voltage
Damaged or pinched wiring harness under the seat
Faulty driver seat occupied switch (sensor or connector)
Corroded or loose connector at the seat switch or module
Faulty occupant detection module or control unit
Aftermarket seat/heater/adjuster wiring misrouted or damaged

Symptoms

SRS / airbag warning lamp illuminated
Seat-occupied indicator or seatbelt reminder behaves incorrectly (always indicates occupied)
Passenger/driver airbag enable/disable status incorrect or locked out
DTC stored for seat occupied switch circuit
Possible failure of seat-related safety features

What to check

Check for SRS warning lamp and note any additional SRS codes
Visually inspect wiring and connectors under the driver seat for damage, pinching, or corrosion
Verify connector(s) are fully seated and locking tabs engaged
Check for aftermarket wiring or recent seat service that may have disturbed harness
Perform a wiggle test of wiring while monitoring the circuit signal or live data for changes

Signal parameters

Expected: Signal should toggle between near 0 V (ground) and near battery voltage depending on switch state and manufacturer design
Fault condition: Signal stuck at battery voltage (~11–14 V) regardless of seat occupancy
Continuity: Closed switch typically shows low resistance (~0 Ω to a few ohms); open shows high resistance/OL
Reference: Check manufacturer-specific service manual for exact voltage thresholds and resistances

Diagnostic algorithm

Safety first: Follow manufacturer procedure to disable the SRS system before working on seat/airbag wiring (disconnect battery negative and wait specified time).
Retrieve freeze-frame and all stored SRS codes to identify related faults.
Visually inspect the driver seat area and harness routing for obvious damage, debris, or pinched wires.
Backprobe the occupied switch connector with ignition on (SRS enabled per procedure) and observe voltage on the signal pin while changing seat occupancy; confirm if signal is stuck at battery voltage.
If the signal is at battery, disconnect the seat switch connector. Measure voltage at the harness side connector. If battery voltage disappears at the harness, the short is likely in the switch or its connector; if still present, the short is upstream in the wiring or power feed.
Check continuity between the signal circuit and battery positive to confirm short. Repair any shorted wiring found.
Inspect connectors for corrosion or pins contacting battery feed. Clean or repair as needed.
If wiring and connectors are good, measure resistance of the switch per service manual or remove switch and bench-test for correct open/closed resistance. Replace switch if out of specification.
If switch and wiring check OK, test or replace the occupant detection module/seat control module per manufacturer guidance.
After repairs, clear codes, re-enable SRS per procedure, and confirm the fault does not return during functional test and road test.

Likely causes

Frayed wire contacting 12V feed under the seat due to seat movement
Connector terminal pushed out and contacting a positive circuit
Moisture/corrosion on the switch connector causing a high voltage reading
Failed internal switch that internally connects to battery
Improperly installed seat or electrical accessory causing a direct short to battery

Fault status

⚠️ Status

Driver seat occupied switch circuit indicates a short to battery voltage; signal is at or near battery voltage when it should change with seat occupancy.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours