B120E

Code

LAND ROVER B — Body

Control of the right electrical device

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 20 RU: 8

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Page language: EN

Causes

Open or short in the right‑side device power supply or ground circuit
Corroded, damaged or poorly seated connector at the right device
Failed right‑side device (motor, actuator, lamp, switch, etc.)
Faulty body control module (BCM) or module output driver
Blown fuse or faulty relay in the circuit
Intermittent wiring damage (pinch, chafe) or water ingress

Symptoms

Right‑side device does not operate (window, mirror, door lock, lamp, etc.)
Intermittent operation or only works in certain positions
Related convenience features on the right side disabled
Instrument cluster or message center warning about right‑side fault
Stored B120E with related network communication errors

What to check

Use a diagnostic scan tool to read the full fault list and freeze‑frame data
Visually inspect the right‑side device, connector and harness for corrosion, damage or water ingress
Check fuses and relays for the affected circuit
Confirm battery voltage at the vehicle (engine off and on)
Attempt to operate the device while observing behavior and any related modules
Check for other DTCs (CAN/BCM) that may point to communications or BCM failures

Signal parameters

Battery supply voltage at device connector: typically ~11–14.5 V (vehicle dependent)
Ground continuity from device ground to chassis: low resistance, typically
Control signal from BCM: presence/absence of control voltage or PWM when commanded (duty cycle 0–100%)
Current draw of device when operating: compare to specification (excessive or zero current indicates short or open)
CAN bus: normal CAN H/L voltages (~2.5 V idle) and presence of BCM messages when commanded

Diagnostic algorithm

Read and record DTCs, freeze frame and any related network codes with a scan tool.
Identify the exact ‘right electrical device’ and associated wiring/fuse/relay using the vehicle wiring diagram.
Perform a visual inspection of the device, connector, and harness at the right side for corrosion, broken wires, pin damage or water entry.
Check/replace the fuse and inspect the relay for the affected circuit.
With connector disconnected, measure supply voltage and ground at the device connector; verify appropriate voltage and good ground. If no voltage, trace back toward fuse/relay/BCM.
Command the device via diagnostic tool while monitoring voltage and current at the connector (watch for PWM or switching from BCM).
Perform a wiggle test of the wiring while commanding the device to reproduce intermittent faults.
Measure resistance of the device (motor or actuator) against specification; if out of range, bench test or substitute a known good device.
If wiring and device are good, inspect BCM outputs for shorted driver or lost comms; check CAN bus messages and module power/ground.
Check for available software updates or calibration notes from manufacturer before replacing a BCM. Replace components only after confirming faulty part.
Clear codes and retest operation to verify repair.

Likely causes

Wiring harness damage or corroded connector at the right device
Failed right‑side actuator / motor / lamp
Poor ground or missing battery voltage at the device
Blown fuse for the right‑side circuit

Fault status

⚠️ Status

Fault detected in control circuit for right‑side electrical device — inspect wiring, connector, device and body control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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