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Seat Headrest Feedback Potentiometer Circuit Short to Ground

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Check the headrest position value in live data; a reading stuck at or near zero while the headrest moves confirms a grounded signal.

  • BBody
  • 2Manufacturer-specific
  • 3Body
  • 05Sequence number

What does it mean?

B2305 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Wiper Park Switch Input Circuit High (Stuck High) .

Symptoms

  • The headrest will not move, or only drives in the direction the module reads as away from zero.
  • Memory recall skips the headrest while seat and mirror recall still work.
  • The position value stays at the bottom of its range in live data no matter what the headrest does.
  • Comfort or active headrest functions are disabled and a message may be displayed.
  • The fault follows seat trim work, a spill or a seat cover installation.

Likely causes

  • Signal wire chafed against the seat frame or a bracket edge inside the seat back.
  • Water or drink soaked into the seat and reaching the actuator connector, creating a path to ground.
  • Terminal pushed back in the connector and touching the metal housing or the shield.
  • Wiring crushed by the recline mechanism, a seat back cover clip or a fastener refitted through the loom.
  • Internal short to the actuator body inside the potentiometer.
  • Loss of the five volt reference feeding the potentiometer, which the module can also log as a grounded signal.
  • Seat control module input stage fault.

How to fix it

  1. Check the headrest position value in live data; a reading stuck at or near zero while the headrest moves confirms a grounded signal.
  2. Measure the five volt reference at the actuator connector first, because a missing reference produces the same symptom as a short to ground.
  3. With the actuator unplugged, measure resistance between the signal wire and ground on the harness side; a very low value proves the short.
  4. If the harness is clean, measure the potentiometer itself through its full travel and look for a track that reads zero or has dead spots.
  5. Inspect the seat back loom at the hinge, frame edges and clip points for chafing, crushing and dampness.
  6. Repair or replace the damaged wiring section and dry out any water intrusion, correcting the source of the leak or spill.
  7. Fit a new potentiometer or actuator assembly when it is proven faulty, then relearn the headrest limits and memory positions.

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.