B141D

Code

LAND ROVER B — Body

Left rear - Climate seat - Electric thermal device 2 temperature sensor

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 22 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring between sensor and seat control module
Corroded, loose, or damaged sensor connector or pins
Failed temperature sensor (thermistor) inside seat pad
Water ingress or contamination in the seat causing sensor failure
Seat wiring harness damage from seat movement or previous repair
Faulty seat climate control module or poor ground/reference voltage

Symptoms

Driver or passenger sees a climate-seat warning or stored DTC
Left rear seat heating/cooling not functioning or inconsistent
Seat temperature reading out of range or erratic in scan tool live data
Possible reduced comfort for occupant; seat may not heat or cool as expected

What to check

Use a diagnostic scan tool to read B141D freeze frame and live data for left rear seat temperature sensor 2
Visually inspect left rear seat upholstery, connectors, and harness for damage, corrosion or water ingress
Check connector engagement and look for bent/filled pins at sensor and seat control module
Perform wiggle test of seat harness while monitoring live data for intermittent changes
Measure continuity between the sensor connector and seat control module pins (refer to wiring diagram)
Measure sensor resistance or voltage at the harness connector with connector disconnected from module (compare to expected range)

Signal parameters

Thermistor-type sensor: resistance varies with temperature (NTC/ PTC) — resistance will change noticeably with hand/heat applied (no fixed universal value; consult manufacturer spec)
Typical signal to seat control module is a voltage that varies within 0–5 V depending on circuit design — expected steady value at ambient temperature (refer to vehicle service manual)
Open-circuit: infinite resistance / no voltage change when heating sensor area
Short to ground: near 0 V at sensor signal line
Short to battery: near battery voltage on signal line

Diagnostic algorithm

Connect OEM-level scan tool; confirm B141D and clear then try to reproduce.
Record live data for left rear climate seat temperature sensors while performing basic tests (hand-warm, sit, wiggle harness).
Perform a thorough visual inspection of the left rear seat area: connectors, harness routing, and seat bottom/back for wear or water damage.
Disconnect the sensor connector at the seat and inspect pins for corrosion, damage or pushed-out terminals; repair or replace connector as required.
With connector disconnected, measure sensor resistance across its terminals at ambient temperature and while warming the sensor (compare change — resistance should decrease/increase depending on sensor type). Refer to Land Rover service data for exact resistance/voltage specifications.
Backprobe connector at module side to verify the signal circuit to the module has continuity; repair any open/shorted wiring.
Verify module power and ground are within specification. If wiring and sensor test good but signal still out of range, update or reprogram the seat climate control module per manufacturer procedure and re-test.
If fault persists after wiring and module checks, replace the left rear seat temperature sensor assembly or the seat climate control module following manufacturer guidance.
After repair, clear codes and perform a road/functional test to ensure the sensor reports properly and no recurrence occurs.

Likely causes

Open or corroded connector at left rear seat sensor
Damaged wiring/harness from seat travel or seat removal
Failed thermistor sensor inside the left rear seat pad

Fault status

⚠️ Status

Left rear climate-seat electric thermal device 2 temperature sensor — signal circuit fault (open/short/intermittent).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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B141D — Left rear - Climate seat - Electric thermal device 2 temperature sensor