B1D01

Code

LAND ROVER B — Body

Medium Right Circuit

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 20 RU: 16

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Page language: EN

Causes

Open or shorted wiring in the Medium Right circuit
Corroded, loose, or damaged connector at the affected device
Failed right-side actuator/lamp/module controlled by the circuit
Blown fuse or fusible link supplying the circuit
Faulty Body Control Module (BCM) or module output driver
Water ingress or physical damage to harness or device

Symptoms

Right-side device operating incorrectly at medium setting or not operating
Intermittent operation or only working at certain settings
Stored B1D01 DTC and possibly related body-control warnings
No operation from the right-side system when commanded
Possible fuse recurrence if short present

What to check

Scan vehicle for additional DTCs and read freeze-frame data
Visually inspect wiring harness and connectors at the right-side device and BCM for damage/corrosion
Check relevant fuses and fusible links for continuity
Back-probe the device connector to check for supply voltage, ground and control signal while commanding the function
Perform continuity and resistance checks between BCM connector and device connector
Perform wiggle test on harness while commanding device to reproduce fault

Signal parameters

Supply voltage to circuit: approx. 11–14 V with ignition on
Control signal: typically switched 0 V (off) or battery voltage; some systems use PWM 0–100% duty
Expected continuity: low resistance between device and module ground (
Open-circuit: infinite/very high resistance between module output and device
Short to ground: near 0 Ω between output and vehicle ground under no-command conditions

Diagnostic algorithm

Retrieve full scan report and freeze-frame. Note any related B‑codes.
Visually inspect the right-side device, connector and harness for corrosion, water ingress, damage or pin push-out.
Check fuses and fusible links that supply the circuit; replace if blown and re-test for recurrence.
With ignition on, back-probe the device connector: verify battery supply, ground and commanded signal while operating the function.
If supply or ground missing, perform continuity/ resistance checks between the device and BCM connectors; repair any open or high-resistance connections.
If supply and ground present but no control signal, verify BCM output using a scope or multimeter (check for expected PWM or switched voltage).
Isolate the device by disconnecting it and measuring resistance from the harness to ground and to battery to identify shorts.
If wiring and connectors are good, swap or bench-test the suspect device (if possible) with a known-good unit and recheck the circuit.
If all external checks pass and device swap fails to resolve, consider BCM output driver fault; consult manufacturer service information before module replacement or reprogramming.
After repairs, clear codes and test the function through full operation cycles and a short road test to confirm repair.

Likely causes

Corroded/loose connector or damaged wiring to the right-side device
Failed device (actuator, motor, lamp or module) on the right side
Open circuit or short to ground on the Medium Right output
Faulty BCM output driver (less common)

Fault status

⚠️ Status

Medium Right Circuit — electrical fault detected on right-side medium circuit (open/short/abnormal signal).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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