OBD Guide
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B2581

Passenger Seat Occupant Detection Circuit Short To Ground

B2581 is an OBD-II diagnostic trouble code meaning: Passenger Seat Occupant Detection Circuit Short To Ground. Common causes: short circuit in the ocs sensor wiring under the seat, damage to the touch mat inside the seat cushion. Estimated repair cost: $33–444.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–444 (est.)

Symptoms

  • SRS (airbag) light is on
  • The PASS AIR BAG OFF indicator lights up when the seat is occupied
  • Or the passenger airbag does not turn off when the seat is empty
  • Code B2581 when diagnosing the SRS unit

Causes

  • Short circuit in the OCS sensor wiring under the seat
  • Damage to the touch mat inside the seat cushion
  • Liquid on the connector or sensor under the seat
  • Damage to the wiring when moving the seat back and forth
  • Malfunction of the OCS module itself

How to Fix

  1. Read SRS unit error codes and record all active faults
  2. Disconnect the battery and wait at least 3 minutes
  3. Check the wiring harness under the passenger seat for pinches or damage.
  4. Check the OCS sensor connector for moisture, oxidation and damage.
  5. Measure the resistance between the signal wire and ground with the connector disconnected
  6. If a short is detected, repair the wiring damage or replace the touch pad/OCS module

Related codes

B2580B2582B2583B1001B0085

FAQ

What does the B2581 code mean?

B2581 is an OBD-II diagnostic trouble code that indicates: Passenger Seat Occupant Detection Circuit Short To Ground

What causes a B2581 error code?

The most common causes of B2581 include: Short circuit in the OCS sensor wiring under the seat; Damage to the touch mat inside the seat cushion; Liquid on the connector or sensor under the seat; Damage to the wiring when moving the seat back and forth.

How do I fix a B2581 diagnostic trouble code?

To fix B2581: Read SRS unit error codes and record all active faults. Disconnect the battery and wait at least 3 minutes. Check the wiring harness under the passenger seat for pinches or damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2581?

Do not drive — repair immediately

How much does it cost to fix B2581?

The estimated repair cost for B2581 is $33–444. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat