B2305

Code

LAND ROVER B — Body

Potentiometer feedback bank for low head support

Brand: LAND ROVER

Type: B — Body

Views: UK: 24 EN: 34 RU: 28

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Page language: EN

Causes

Open or short in potentiometer signal wiring
Corroded or loose connector at potentiometer or control module
Failed/dirty potentiometer inside the head support actuator
Mechanical binding or broken gear preventing movement
Loss of reference voltage or ground to the potentiometer
Intermittent connection caused by damaged wiring harness (pinch, chafe)

Symptoms

Low head support/headrest will not move or adjust
Head support may move erratically or stop at incorrect positions
Seat/comfort system warning message or lamp
Stored related DTCs and possible loss of linked features (memory positions)

What to check

Scan vehicle and confirm B2305 plus any related codes; note freeze-frame data
Visually inspect connectors, wiring and harness along seat and headrest for damage or corrosion
Check relevant fuses and ground points for continuity and tightness
Operate head support while observing/feeling for mechanical binding or unusual noises
Wiggle test harness while operating to reproduce fault
Check for software updates or technical service bulletins affecting headrest module

Signal parameters

Potentiometer uses a reference voltage (typically ~5 V) and ground; signal output varies with position
Expected signal range: approximately 0.5–4.5 V (varies by design) while head support moves
Open circuit: signal reads near 0 V or battery voltage (if shorted to Vb)
Short to ground: signal near 0 V; short to battery: signal near battery voltage
Resistance across potentiometer terminals typically in the kilo-ohm range (manufacturer specific)

Diagnostic algorithm

Retrieve freeze frame and note conditions when fault set. Clear code and attempt to re-create by operating the head support.
Perform visual inspection of headrest/seat harness, connectors and actuator for obvious damage or moisture. Repair any visible faults.
With ignition on, back-probe the potentiometer connector. Verify reference voltage (≈5 V) and good ground. If missing, trace to fuse/ground and repair.
Command the head support through its range while measuring the signal wire voltage; confirm the voltage changes smoothly through the expected range. Intermittent or no change indicates potentiometer or wiring fault.
If voltage is stuck at 0 V or battery voltage, check for short to ground or Vb. Isolate wiring and measure resistance to ground/power to locate short.
With connector disconnected, measure potentiometer resistance across terminals while moving head support (if accessible). Resistance should change smoothly without open/erratic steps.
If wiring and connectors test good but potentiometer readings are bad, remove and replace/repair actuator or potentiometer assembly. Re-test before final assembly.
If component replacement does not clear the issue, inspect the control module communications and power. Consider module replacement or software re-flash per manufacturer guidance.
After repair, clear codes and perform full function test and a few cycles to ensure no return of the fault.

Likely causes

Wiring damage at seat/headrest harness (common at hinge points)
Connector contamination or corrosion where the headrest plugs into the seat harness
Failed potentiometer inside actuator after moisture ingress
Blown fuse or poor ground affecting the reference circuit

Fault status

⚠️ Status

Potentiometer feedback circuit - low head support: signal open/short/out of range or intermittent (B2305).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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LAND ROVER

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