B1415

Code

LAND ROVER B — Body

Front left - seat temperature control module

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 23 RU: 22

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Page language: EN

Causes

Blown fuse or relay for seat heating circuit
Poor power or ground connection to the front-left seat module
Damaged or corroded connector/wiring (open, short to battery or short to ground)
Failed front-left seat temperature control module (internal electronics)
Open or shorted seat heater element or temperature sensor (thermistor)
Loss of communication on vehicle bus (CAN/LIN) to the seat module

Symptoms

Front-left seat heater not working or not switching levels
Front-left seat temperature control message or warning in cluster
One or more seat heating settings unresponsive or defaulting to off
Related HVAC or seat comfort warning lights or messages
Stored B1415 DTC (may be accompanied by other seat module codes)

What to check

Read stored DTCs and freeze-frame data with a compatible scan tool; record any additional seat or comfort module codes
Visually inspect fuse(s) and relays related to seat heating; check fuse continuity
Inspect connector(s) at the front-left seat module for corrosion, bent pins, water ingress, or damage
Inspect wiring harness along seat rails and under the seat for chafing, broken wires or pinched sections
Check for any recent interior work, spills or seat removal that may have disturbed connectors
Confirm whether the vehicle uses CAN or LIN communication for seat modules and check bus health (other modules on same bus)

Signal parameters

Module supply voltage (engine off/on): approximately 11–14.5 V at the module connector with heater circuit fuse intact
Ground continuity:
Heater element resistance (typical): varies by seat design; expect roughly 0.5–5 Ω across the heater pads (verify with service data)
Seat temperature sensor (thermistor) resistance: varies with temperature; expect a few kiloohms at ambient — resistance should change with temperature when warmed/cooled
Heater current draw: may peak between about 5–15 A when heating at high setting (measure with appropriate clamp meter)
Communication bus idle voltages: CAN_H/CAN_L ≈ 2.5 V nominal idle each (differential present when active); LIN idle approx. battery voltage (if applicable) — verify per model service data

Diagnostic algorithm

Connect a diagnostic scan tool and read all stored codes and module status messages; record relevant freeze-frame and data stream values.
Verify related fuses and relays: inspect and test continuity; replace blown fuses only after diagnosing cause.
Perform visual inspection of the front-left seat connectors and harness (under-seat, seat base and along rails). Repair any damaged wiring or corroded connectors.
With ignition ON (and per service manual safety procedures), backprobe the module power supply pin and measure voltage; confirm 11–14.5 V. If no voltage, trace power feed and check fused circuits/relays.
Verify ground at the module: measure voltage drop between module ground and battery negative during a heater ON command; excessive drop indicates poor ground.
Check communication: with scan tool, confirm the front-left seat module is present on the bus and showing live data. If not present, check bus wiring and termination and other nodes on the same bus.
Measure heater element resistance at the seat connector (module disconnected) and compare to service spec; check for open or short. Also measure seat temperature sensor resistance and verify it changes with applied heat or cold.
If wiring, power and ground are good but the module does not respond, consider substituting a known-good module (if available and compatible) or reprogramming per service procedures.
After repairs, clear codes and perform functional test (cycle seat heating through all levels and monitor module responses). Re-scan to ensure B1415 does not return.
Follow all manufacturer safety procedures when working near seats and SRS components; disconnect battery and allow SRS capacitors to discharge if required by the service manual before removing seats or side airbag connectors.

Likely causes

Loose/corroded connector or wiring at the front-left seat module
Blown fuse or interrupted power/ground to the seat module
Failed front-left seat temperature control module
Open or high-resistance heater element or temperature sensor

Fault status

⚠️ Status

Fault detected in front-left seat temperature control module or its associated circuits (power, ground, heater element, temperature sensor, or communication).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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B1415 — Front left - seat temperature control module