B2303

Code

Other B — Body

Seat Headrest Feedback Potentiometer Circuit Open

Brand: Other

Type: B — Body

Views: UK: 27 EN: 43 RU: 36

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Page language: EN

Causes

Open or broken wiring between the headrest potentiometer and the control module
Disconnected, loose or corroded connector(s)
Failed headrest feedback potentiometer (internal open)
Poor or missing ground or reference supply to the sensor
Previous seat repair or trim removal damaged wiring or connector
Faulty control module (rare)

Symptoms

Airbag/SRS warning lamp or other seat-related warning illuminated
Seat position/memory functions may not operate correctly
Seat/headrest position feedback not available in scan tool
Possible disablement of systems that rely on occupant/seat position

What to check

Retrieve codes and freeze frame data with a scan tool; note related codes
Perform visual inspection of seat, headrest, connectors and wiring for damage or corrosion
Backprobe connector at the potentiometer and control module to check for reference voltage, signal and ground
Check connector pins for continuity to control module with connectors unplugged
Wiggle test: move wiring and connector while monitoring live data for intermittent changes
Measure resistance across potentiometer terminals while moving headrest (if serviceable)

Signal parameters

Reference voltage: typically ~5 V (key ON) — verify factory spec
Signal output: variable between ~0–5 V depending on headrest position
Ground: near 0 V
Potentiometer resistance: varies with position — often in the 1 kΩ–10 kΩ range (verify vehicle spec)
Open-circuit result: infinite resistance or no signal voltage

Diagnostic algorithm

Record B2303 and any related codes, note freeze frame and vehicle history.
Visually inspect the seat, headrest, wiring harness, connectors and seat-base junction for damage, loose pins or corrosion.
With ignition ON (engine off) and using a DMM/scan tool, verify reference supply (usually 5 V) and ground at the headrest potentiometer connector.
Probe the signal lead while moving the headrest; observe voltage change on scan tool or multimeter. If no change and no signal, suspect open circuit.
With connectors disconnected, check continuity between the potentiometer signal/ground/reference pins and the control module pins. An open indicates wiring or connector fault.
If wiring and connectors show good continuity and proper reference/ground, measure resistance of the potentiometer element. Infinite/open resistance indicates failed potentiometer.
Repair or replace damaged wiring/connectors. If sensor element is faulty, replace the headrest assembly or potentiometer per manufacturer procedure (may require seat trim removal).
After repair, clear codes, perform self-tests and verify operation and that no related codes remain.

Likely causes

Damaged wire harness in seat (pinched, chafed or broken)
Connector pushed out, bent pins or corrosion at seat connector
Potentiometer element failed or internally open
Ground terminal burned or loose at seat frame
Aftermarket seat or improper reassembly caused open circuit

Fault status

⚠️ Status

Control module detected an open circuit in the seat headrest feedback potentiometer circuit. The expected sensor signal or continuity is missing, causing the module to store fault B2303.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3 hours