B1965

Code

LAND ROVER B — Body

advance / retreat outside the low range

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 21 RU: 12

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Page language: EN

Causes

Faulty position sensor (potentiometer or Hall sensor) on advance/retreat actuator
Open/shorted or corroded wiring or connectors between actuator and control module
Mechanical binding or obstruction of the track/actuator
Failed seat/actuator motor or internal limit switch
Calibration or software fault in the seat control module
Intermittent connection due to water ingress or damaged harness

Symptoms

Warning lamp or message related to seat/positioning
Seat advance/retreat movement unavailable or stops prematurely
Seat position memory fails to store or recall correctly
Audible motor noise without movement or intermittent movement
Seat behaves erratically or moves beyond expected limits

What to check

Confirm the customer complaint and note when fault occurs (all positions, single direction, intermittently)
Check for any related DTCs stored in the seat module or body control module
Perform a visual inspection of the seat track, actuator, connectors and wiring for damage, corrosion, or water ingress
Operate the seat while observing for mechanical binding, abnormal resistance or unusual noises
Verify connectors are fully seated and locking features engaged at the seat module and actuator

Signal parameters

Reference supply typical: 5.0 V (sensor reference) — verify with vehicle-specific data
Expected sensor signal (potentiometer/Hall): approx. 0.5–4.5 V across travel; should change smoothly when moving
At low-range position sensor: voltage typically near lower limit (≈0.2–0.7 V); if below expected threshold fault may be set
Potentiometer resistance across travel typically changes smoothly (value depends on design) — check for open or short
Actuator motor current: brief peaks during movement; typical 2–10 A under load (verify with manufacturer data)
Limit switch continuity: near 0 Ω when closed, open when released (if applicable)

Diagnostic algorithm

Read and record stored DTCs and freeze frame data from the seat and body modules
Attempt seat advance/retreat while monitoring the sensor output voltage at the actuator connector — observe whether signal moves smoothly through range
Inspect connectors and wiring for damage, corrosion, pin push-out and water intrusion; wiggle harness while observing signal for intermittent faults
Check for mechanical obstructions: fully inspect and manually move the track (with battery disconnected for physical checks) to ensure rollers and tracks are free
Measure resistance or output of the position sensor (potentiometer/Hall) at rest and during travel; compare to manufacturer specifications
Verify supply voltage and ground at the actuator connector with ignition on and while operating the seat
If sensor or wiring is suspect, replace or repair the harness/connector and re-test
If electrical and mechanical checks are good, perform seat module reinitialisation/calibration using a diagnostic tool and clear codes; retest operation
If fault persists after calibration and wiring checks, replace the advance/retreat actuator or seat module per workshop procedures and recheck
After repairs, clear DTCs and perform a full function test including memory recall and repeated movements

Likely causes

Damaged position potentiometer on the advance/retreat actuator
Broken or shorted conductor in the seat harness at the track area
Debris, jammed rollers or bent track preventing normal movement
Faulty ground or supply at the actuator connector causing erroneous sensor voltage
Seat control module requiring reinitialisation or software update

Fault status

⚠️ Status

Advance/retreat outside the low range — position sensor for advance/retreat is reporting a value below the expected low limit or out of range. Could be electrical, mechanical or calibration related; further diagnosis required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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