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Home / DTC / B103A — Right front seat heating sensor

B103A — Right front seat heating sensor

Detailed page for trouble code B103A.

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B103A

LAND ROVER B — Body

Right front seat heating sensor

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in right front seat heater sensor wiring or connector
  • Corroded, loose, or contaminated seat connector pins
  • Faulty right front seat temperature/thermistor sensor (NTC/RTD)
  • Faulty seat heating element or damage inside the seat cushion affecting the sensor
  • Seat control module/software fault or loss of communication (CAN)
  • Blown fuse or high resistance in supply/ground to the seat module

Symptoms

  • Right front seat heater not working or heating intermittently
  • Seat heater control shows incorrect temperature readout or unavailable function
  • Warning message or amber indicator related to seat heating on instrument cluster
  • DTC stored and may prevent operation of seat heating for that seat

What to check

  • Use a diagnostic scan tool to read the fault code, freeze frame data and live sensor values for the right front seat heater sensor
  • Visually inspect right front seat connectors, harness routing through seat base and under-dash, look for damaged insulation, corrosion and pinched wires
  • Check for other stored codes that indicate module or CAN bus issues
  • Verify fuses and power/ground to the seat heating module and seat module (if separate)
  • With ignition on, backprobe the sensor connector and measure signal and reference voltages; compare to expected values
  • Measure sensor resistance at ambient temperature (with connector disconnected) and look for open/short

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature increases) — vehicle-specific
  • Typical behaviour: at room temperature the sensor resistance is expected in a moderate kilo-ohm range (consult OEM spec). Resistance should change smoothly when warming or cooling the sensor.
  • Signal wiring: usually three or two wires (sensor, reference/5V and ground or sensor pair) — verify pinout with vehicle wiring diagram

Diagnostic algorithm

  1. Connect a qualified scan tool and confirm B103A and any related codes; record freeze-frame and current sensor readings.
  2. Attempt to reproduce the fault by cycling seat heater and monitoring live sensor value for the right front seat. Note whether value is open (OL), short to ground, short to supply, or implausible.
  3. Visually inspect the right front seat area: connectors under the seat, seat base grommet, and the harness where it enters the B-pillar or floor for damage, chafing, or corrosion.
  4. With ignition off, disconnect right front seat sensor connector and inspect terminals for corrosion, bent pins or contamination. Repair or clean as required.
  5. Measure sensor resistance at the connector with the sensor disconnected. Compare to OEM specification (or verify resistance changes when applying heat/cold to the sensor). If resistance is open or shorted, replace the sensor.
  6. Backprobe the sensor connector with ignition on and check reference voltage and ground presence. If no reference/ground, trace and repair power/ground or fuses to the seat module.
  7. Perform a wiggle test on the harness and connectors while monitoring live data for intermittent changes. Repair broken wires or restore secure connections.
  8. If wiring and sensor test good, check seat control module operation and communication (CAN). Verify module software level; reprogram or replace module only after confirming upstream wiring/sensor OK.
  9. After repairs, clear codes, operate seat heater through several cycles and confirm the code does not return and sensor readings are stable.

Likely causes

  • Connector push-fit/terminal corrosion or pin damage at the right front seat harness
  • Broken or pinched wire in seat harness (common where harness passes through seat frame)
  • Failed seat temperature sensor (thermistor) due to wear or moisture ingress

Fault status

⚠️ Status
Right front seat heating sensor circuit fault detected — open/short or implausible sensor signal reported by seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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