Auto electrical · BCM · Wiring · PicoScope

Scope the wiring before you replace the module.

Most Land Rover electrical faults aren't the module the code names — they're the wiring, the ground, or the supply voltage feeding it. We trace, scope, and find the actual fault. No parts cannon.

Auto electrical
specialist
Twenty years on Land Rover wiring — we know which harness fails on which model.
PicoScope on
every circuit
Voltage and current waveforms tell us if it's the part or the wire.
Module coding
& programming
BCM, key, ABS module — coded with the factory scan tool, not a generic clone.
Honest
up-front quote
Diagnosis first, quote second. You decide before any work begins.
Fast
turnaround
Most transmission jobs in and out same-day or next.
About auto electrical

Land Rovers are
computers on wheels.

Modern Land Rovers run 30+ control modules talking to each other over CAN, LIN and FlexRay buses. Most electrical faults aren't the module — they're the wiring: a broken trace inside a harness, a corroded ground, a chafed wire, a marginal connector. The module reports the symptom; the wiring is the cause.

The parts cannon doesn't work on these cars. Replace a BCM that's not faulty and you've just spent $1,800 to find out the issue is still there. We scope the signals first — voltage drop, current flow, communication on the bus — and identify the actual failure point.

  • Voltage drop & continuity tests on every suspect wire
  • PicoScope waveform analysis on injectors, sensors, solenoids
  • CAN bus traffic analysis to find the talkative or silent module
  • Module coding & programming via JLR factory tools
Common electrical symptoms
  • Multiple unrelated warning lights at once
  • Intermittent fault that won't repeat in the workshop
  • Replaced a module — same fault is still there
  • Car battery flat overnight (parasitic drain)
  • Module won't wake / car "locked" out of functions
The myth

The code says BCM — replace the BCM.

It's a tempting shortcut. It almost never works on a Land Rover. Most module codes point to a circuit fault that the module is reporting — the module itself is fine.

The truth

Most module faults are wiring.

Power supply, ground, or a broken trace in the harness. Scope the supply voltage, scope the ground, scope the signal, find the break. Then the module starts working again — no module replacement required.

Our electrical services

Six ways we trace
electrical faults.

Full system electrical scan

Every module read, every code captured with freeze-frame data. We tell you which module is complaining and what it's actually trying to say.

PicoScope waveform analysis

Voltage and current on injectors, sensors, solenoids, ignition coils. The waveform shows you exactly which signal is wrong — not just which code is set.

Wiring & harness tracing

Voltage drop tests, continuity, harness scope. We find the broken trace inside the loom that's been dropping power intermittently.

Parasitic drain diagnosis

Amp clamp on each fuse circuit. Find the module that won't sleep — or the accessory that's been left on. Battery saved.

Module coding & programming

BCM, key, ABS module, transmission TCM. Programmed and coded with the factory JLR tool — not a generic clone tool.

Lighting & adaptive headlights

Adaptive headlight failure, LED tail-light faults, AFS calibration after a strut change. The electrical side of every lighting system.

Suitable for every Land Rover

Every model. Every generation.

Range RoverRange Rover
Range Rover SportRange Rover Sport
DefenderDefender
DiscoveryDiscovery
Velar & EvoqueVelar & Evoque
FreelanderFreelander
Electrical symptoms decoded

If it's doing this,
this is probably why.

Land Rover electrical faults follow patterns. Here's what we see week-in-week-out and what each one usually turns out to be.

Symptom 01

All lights on the dash

Engine, ABS, traction, suspension — all warning at once. Almost always a power/ground fault rather than every module failing simultaneously.

Symptom 02

Intermittent power loss

Car cuts out, restarts, runs fine. Usually a marginal connector or a wire chafed against a chassis edge. We datalog and find it.

Symptom 03

Battery drain overnight

Module not sleeping, accessory drawing current, parasitic load. Amp clamp on each fuse circuit finds the offender.

Symptom 04

Key won't program

Often a security module sync issue, not the key. JLR Pathfinder talks to the immobiliser properly where generic tools can't.

Symptom 05

BCM "comms lost"

Loose connector or corroded pin behind the dash. Wiggle test + scope finds it in minutes.

Symptom 06

Window stops working

Regulator, motor, or switch. Voltage drop test rules out the wiring before you replace anything.

Symptom 07

Sat-nav / infotainment freezes

Software fault, USB-port short, or a head-unit power supply issue. Logged before we condemn the head unit.

Symptom 08

Adaptive headlight fault

Bulb out, level sensor stuck, or AFS module miscalibrated. Calibration is the fix nine times out of ten.

How an electrical diagnosis goes

Scope. Trace.
Repair.

Step 01

Scan every module

Full system scan via Snap-on Verdict and JLR Pathfinder. Every code, every freeze-frame, every live-data PID from every module on the bus. We don't miss the relevant one.

Step 02

Scope the suspect circuit

PicoScope on the wire feeding the module. Voltage, current, signal — we see exactly where the failure is between the connector and the part.

Step 03

Repair the wire, not the module

Replace the broken trace, clean the corroded ground, re-pin the marginal connector. Re-test, verify clean, code-clear, road-test. The module reports OK — because it was always fine.

"I drive past three workshops to get to Michael. I had a Defender 110 with an electrical fault no one could trace. Two days at Michael's and it was sorted. He scopes the wiring instead of guess-replacing modules — that alone has saved me thousands over the years."

Anthony L. Defender 110 · 2021 · Word of mouth
Before you replace a module.

Scope it first.
Save the module money.

If you're staring at a quote for a BCM, ECM, or any other module — bring it in for a second look. The fault is probably the wire, not the box.