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Home / DTC / B1158 — Front seat heater sensor

B1158 — Front seat heater sensor

Detailed page for trouble code B1158.

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Code

B1158

LAND ROVER B — Body

Front seat heater sensor

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 14 RU: 8
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Page language: EN

Causes

  • Open or short in sensor wiring harness
  • Corroded or loose connector at seat sensor or seat module
  • Defective seat heater temperature sensor (thermistor)
  • Damaged seat cushion wiring or heating element affecting the sensor circuit
  • Faulty seat control module or body control module
  • Water/moisture ingress in the seat or connector

Symptoms

  • Front seat heater inoperative or limited operation
  • Seat heater warning or indicator lamp on dash or in infotainment
  • Seat temperature not changing or reported temperature is incorrect
  • DTC stored in fault memory, possible limp/heater disable
  • Intermittent heating or inconsistent heat level

What to check

  • Read and record all stored codes with an appropriate diagnostic scanner; note freeze-frame or related B/C/P codes.
  • Clear codes, attempt to reproduce and see if B1158 returns.
  • Visually inspect seat connector(s), wiring harness along seat base and under trim for damage, pin corrosion, or moisture.
  • Unplug connector at seat sensor/module and inspect pins for corrosion, bent pins, or contamination.
  • Measure resistance of the seat temperature sensor with an ohmmeter (sensor disconnected from module).
  • With scanner, monitor live data for the seat temperature sensor signal while heating or applying heat to the sensor area.

Signal parameters

  • Sensor type: typically a thermistor (NTC or PTC) mounted in the seat cushion/backrest — passive resistance sensor.
  • Typical resistance behaviour: resistance value should change with temperature (resistance decreases with rising temp for NTC; increases for PTC).
  • Common resistance range at approx. 20°C often falls in the kilo-ohm range (manufacturer-specific — consult service data).
  • Expect near-open-circuit or short-circuit readings when sensor/wiring is faulty (OL on meter or ~0 Ω).
  • Heater element circuits are powered from 12V; sensor is usually low-voltage passive — verify reference voltages at seat module per service manual.

Diagnostic algorithm

  1. Connect a capable scan tool; read and record all fault codes and freeze-frame data.
  2. Clear B1158, cycle ignition and seat heater; see if code returns to confirm repeatability.
  3. Visually inspect seat upholstery seams, connectors under seat, and harness routing for damage or moisture.
  4. Locate the seat temperature sensor connector; disconnect and inspect pins for corrosion or damage.
  5. Measure sensor resistance at ambient temp with sensor disconnected. Verify resistance changes when warming the sensor (use warm air or touch) — if no change, replace sensor.
  6. Check continuity between sensor connector and seat control module pins; repair any opens/shorts.
  7. With ignition on, verify supply/ground/reference signals to seat module and relevant sensor circuits using a DVOM or scope while operating heater controls.
  8. If wiring and sensor test good, test or swap seat control module (if applicable) or reflash/reprogram module per manufacturer guidance.
  9. After repairs, clear codes and perform functional test of seat heater across all settings; confirm B1158 does not return.

Likely causes

  • Damaged or disconnected sensor connector/wiring
  • Failed seat heater temperature sensor (thermistor)
  • Corrosion or poor contact at connector pins
  • Faulty seat control module or seat ECU

Fault status

⚠️ Status
B1158 — Front seat heater sensor: fault detected in the temperature sensor/circuit for the front seat heater. The seat control or body module has detected an open, short, out-of-range, or implausible sensor signal which may disable or limit seat heating until corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

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