B11C2

Code

LAND ROVER B — Body

Relay close to the attacker

Brand: LAND ROVER

Type: B — Body

Views: UK: 22 EN: 28 RU: 27

AI status

Completed

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Page language: EN

Causes

Faulty relay (sticking, welded contacts, or open coil)
Damaged or corroded relay socket or connector
Broken, shorted or high-resistance wiring between ECU/module and relay
Poor chassis or battery ground near relay/actuator
Blown or intermittent fuse supplying the relay coil or load
Faulty control module or driver transistor that energizes the relay

Symptoms

Related actuator or subsystem does not operate (e.g., pump, motor, heater flap, lock)
Intermittent operation of the component or stuck ON/OFF condition
Fuses blowing or recurrent relay audible clicking
Warning message or lamp on dash related to the affected system
Parasitic battery drain when vehicle is off (if relay stuck closed)

What to check

Read live data and freeze frame with manufacturer scan tool; note relay control status and related subsystem status
Visually inspect the relay, relay socket, and nearby harness for corrosion, melted plastic, or water ingress
Check related fuses for continuity and correct rating
With ignition on, probe relay coil supply and ground pins for battery voltage and control signal
Measure resistance of relay coil and compare to specification (replace relay if out of range)
Wiggle-test connectors and wiring while monitoring operation to reproduce intermittent faults

Signal parameters

Relay coil supply (pin B+ with ignition or commanded feed): ~12 V (vehicle battery voltage)
Relay coil control (ECU driver side): 0 V when active (low-side switch) or ~12 V when inactive depending on design — consult wiring diagram
Relay coil resistance: typically tens to a few hundred ohms (manufacturer specific)
Switched output (relay contact to load): battery voltage when relay closed, open circuit when relay open
Module communication and status flags: OK/No comm (check CAN/BUS messages)

Diagnostic algorithm

Retrieve full fault data with a Land Rover diagnostic tool and note related subsystem and freeze-frame conditions
Identify exact relay and circuit from vehicle-specific wiring diagram and component locator
Perform visual inspection of relay and socket; replace relay with known-good unit and re-check fault (use only correct part number)
Check fuse(s) in the supply path for continuity and correct rating; inspect for thermal damage
With a multimeter, verify battery voltage at the relay supply pin with ignition on and engine off
Energize the relay (carefully) and verify the switched output goes to battery voltage; verify coil control signal from the module when the subsystem is requested
Measure coil resistance on the removed relay; compare to spec — if out of range, replace relay
If relay and fuses are good, back-probe/control module connector to confirm module is commanding the relay and that ground reference is solid
Perform wiggle/pressure tests on wiring and connectors while commanding the relay to catch intermittent faults
If wiring and relay are OK but no command from module, check module power/ground and CAN communication; further module-level diagnostics may be required
Clear the code and perform function test; if the code returns, continue with targeted wiring repair or module repair/replacement as indicated by test results

Likely causes

Failed relay or internal contact weld
Corroded/loose connector or socket at the relay
Open or short in the relay control wire between BCM/ECU and relay

Fault status

⚠️ Status

Relay circuit fault near actuator — relay failed to operate as expected (open/short/intermittent).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

Manual library for LAND ROVER

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Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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