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Seat Headrest Feedback Potentiometer Circuit Short to Battery

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Read the seat module codes and check the headrest position value in live data at rest and while the headrest is driven.

  • BBody
  • 2Manufacturer-specific
  • 3Body
  • 04Sequence number

What does it mean?

B2304 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Wiper Park Switch Input Circuit Low (Stuck Low) .

Symptoms

  • The power headrest stops responding to the switch, or runs to one end and stays there.
  • Memory recall no longer positions the headrest even though the seat moves normally.
  • The headrest moves unexpectedly when other seat functions are used.
  • Active head restraint and comfort headrest features are disabled.
  • The fault often appears after a drink was spilled or after the seat back was removed and refitted.

Likely causes

  • Chafed wire in the seat back loom where the signal wire has rubbed through against the headrest motor supply.
  • Liquid spilled down the seat back into the headrest actuator connector, bridging the signal pin to the motor feed.
  • Bent, corroded or pushed back terminal in the actuator or seat module connector touching a powered pin.
  • Wiring pinched by the seat frame, recline mechanism or a loose bracket when the seat back was moved.
  • Internal short inside the potentiometer or the actuator assembly connecting the wiper track to the motor supply.
  • Aftermarket seat heater, cover or accessory wiring routed through the seat loom.
  • Seat control module internal fault on the sensor input.

How to fix it

  1. Read the seat module codes and check the headrest position value in live data at rest and while the headrest is driven.
  2. A reading permanently at full scale confirms the signal line is being pulled to supply.
  3. Unplug the headrest actuator and measure the signal wire from the harness side for battery voltage with the key on.
  4. If voltage is still present with the actuator disconnected, the short is in the harness; if it disappears, the potentiometer or actuator is at fault.
  5. Inspect the seat back loom at the recline hinge and frame edges for chafing, crushing and moisture, and check for spilled liquid in the connector.
  6. Repair the damaged wiring with sealed crimped joints, replace corroded terminals and reroute the loom clear of moving parts.
  7. Replace the actuator or potentiometer only after the wiring is proven, then relearn the headrest travel 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.