This is the original OEM workshop document for the 2014-2018 Lexus LX 570 wiring diagram including Lexus LX 460 (LHD and RHD) in PDF.
🧭 Overview
The 2014–2018 Lexus LX 570 is Lexus’ flagship body-on-frame SUV: a luxury take on the Land Cruiser platform with a 5.7L naturally aspirated V8, full-time 4WD, and a comfort-first suspension system designed to stay composed on highways while still being trail-capable. A key mid-cycle update arrived for 2016, bringing a refreshed design and an 8-speed automatic transmission (replacing the previous 6-speed).
🧾 Technical Specs (2014–2018)
- 🧱 Platform: Body-on-frame (Land Cruiser-based), 4-door SUV
- 🛞 Drivetrain: Full-time 4WD
- 🧠 Engine: 5.7L V8 (383 hp / 403 lb-ft)
- ⚙️ Transmission:
- 2014–2015: 6-speed automatic
- 2016–2018: 8-speed automatic (update)
- 🪝 Max towing (properly equipped): 7,000 lb
- 📏 Wheelbase: 112.2 in
- 🌄 Ground clearance: 8.9 in
- ⚖️ Curb weight (approx., varies by trim/options): ~6,000 lb
ℹ️ Specs vary by market/trim and options. Always verify against your VIN/door-jamb label and the owner’s manual for your exact vehicle.
🏁 Performance & Driving
- 🚀 Power delivery: Smooth, torque-rich V8 tuned for effortless acceleration rather than sportiness.
- 🛣️ Ride: Comfort-biased, especially with the LX’s height-adjustable hydraulic suspension system.
- ⛰️ Capability: Serious off-road hardware underneath, with selectable modes and robust chassis fundamentals.
- ⛽ Real-world economy: Expect “V8 + heavy SUV” reality—budget for fuel accordingly.
🛠️ Top 10 Common Mechanical Issues Reported by Owners (Root Cause + Fix)
- Coolant “valley plate” leak (5.7L V8)
🔎 Root cause: Seepage at the coolant passage cover/valley area over time (heat cycles + gasket aging).
✅ Fix: Pressure-test cooling system; confirm leak location; reseal/replace valley cover gasket(s); refresh coolant; inspect nearby hoses. - Radiator end-tank seepage / coolant smell
🔎 Root cause: Plastic end tanks and seals age; micro-cracks or seam seepage can develop on high-heat, high-mile vehicles.
✅ Fix: Replace radiator proactively if seepage is confirmed; replace cap; bleed system correctly; inspect fan clutch & thermostat. - Water pump seep / bearing noise
🔎 Root cause: Seal wear and bearing degradation with mileage/age.
✅ Fix: Replace water pump (often best with belt, idlers, and fresh coolant); confirm no contamination or overheating history. - Secondary Air Injection (SAI) system faults
🔎 Root cause: Moisture intrusion, pump wear, stuck valves, or carbon buildup can trigger cold-start emissions faults.
✅ Fix: Diagnose with scan tool; check pumps/valves; repair/replace failed components; verify updated parts where applicable. - AHC / hydraulic suspension sag or “lean”
🔎 Root cause: Aging hydraulic components, sensor drift, fluid contamination, or nitrogen accumulator degradation.
✅ Fix: Check fluid condition/level; inspect for leaks; calibrate height sensors; service/replace accumulators if ride is harsh. - Brake vibration / warped rotors (heavy SUV)
🔎 Root cause: Heat management + pad material + torque practices can create thickness variation.
✅ Fix: Measure runout; correct hub/rotor mating; replace rotors/pads as a set; torque wheels properly; bed pads correctly. - Driveline “clunk” (takeoff/stop)
🔎 Root cause: Slip yoke/prop shaft spline lubrication needs; wear in U-joints or mounts can contribute.
✅ Fix: Service/grease driveline per spec; inspect U-joints, mounts, and driveline angles; replace worn components. - Steering rack seepage / loose steering feel
🔎 Root cause: Seal wear and aging; heavy front-end loads accelerate wear.
✅ Fix: Confirm leak source; repair/replace rack as needed; align; inspect tie rods/ball joints. - Transfer case or differential seepage
🔎 Root cause: Seals/gaskets age; off-road heat cycles and time accelerate seepage.
✅ Fix: Clean and recheck; replace leaking seals; service fluids at appropriate intervals (especially if towing/off-roading). - Exhaust manifold tick (cold start)
🔎 Root cause: Expansion/contraction + fastener stress; small leaks can develop over time.
✅ Fix: Smoke-test exhaust; replace gaskets/hardware if leaking; inspect for cracks.
🧪 Tip: For any “common issue,” confirm with a scan tool + proper tests before replacing parts—especially on a premium SUV where parts costs add up.
⚡ Top 10 Common Electrical Issues Reported by Owners (Root Cause + Fix)
- Infotainment glitches / head unit freezes
🔎 Root cause: Software bugs, aging memory/storage, or voltage dips.
✅ Fix: Check for software updates; battery/charging test; inspect grounds; reset/reflash where supported. - ML/Audio amplifier intermittent sound
🔎 Root cause: Heat-related solder fatigue or moisture exposure; connector corrosion.
✅ Fix: Verify power/ground; inspect connectors; repair/replace amp if confirmed faulty. - Backup camera intermittently black/snowy
🔎 Root cause: Camera module wear, harness strain at tailgate hinge, or moisture intrusion.
✅ Fix: Check harness continuity at hinge area; reseal/replace camera module; clean/secure connectors. - Door lock actuators slow or failing
🔎 Root cause: Actuator motor wear and mechanical drag over time.
✅ Fix: Replace actuator; verify key fob and body ECU outputs; lubricate latch mechanisms. - Power window slow / stops mid-travel
🔎 Root cause: Regulator wear, dry window channels, or anti-pinch calibration drift.
✅ Fix: Clean/lube channels; recalibrate auto-up; replace regulator/motor if worn. - TPMS warning light (sensor battery aging)
🔎 Root cause: TPMS sensor internal batteries reach end of life after years.
✅ Fix: Replace sensors during tire service; program IDs; verify correct frequency per market. - Battery drain / parasitic draw
🔎 Root cause: Always-on modules, aging batteries, or accessory devices (dash cams) tied incorrectly.
✅ Fix: Parasitic draw test; update modules if applicable; replace weak battery; rewire accessories to proper ignition sources. - Parking sensors false beeps
🔎 Root cause: Sensor contamination, impact damage, or harness corrosion.
✅ Fix: Clean sensors; scan for DTCs; test each sensor; replace failed units. - HVAC actuator clicking / incorrect vent mode
🔎 Root cause: Blend/mode door actuator gear wear or calibration issues.
✅ Fix: Run HVAC self-test; replace actuator; recalibrate HVAC system. - Keyless entry/Smart Key range issues
🔎 Root cause: Weak key fob battery, antenna issues, or interference.
✅ Fix: Replace fob battery; test antennas; scan body control for codes; re-register keys if needed.
✅ Pros & ❌ Cons
| ✅ Pros | ❌ Cons |
|---|---|
| 🧱 Extremely robust platform and drivetrain fundamentals | ⛽ Fuel consumption is high (heavy V8 SUV) |
| 🛋️ Luxury cabin comfort + long-distance refinement | 💸 Premium parts/labor costs vs mainstream SUVs |
| 🪝 Strong towing capability (up to 7,000 lb) | 📦 Limited cargo space behind 3rd row |
| ⛰️ Legit off-road capability under the luxury layer | ⚙️ Suspension/hydraulic systems can be pricey as vehicles age |
| 🔇 Quiet, smooth power delivery (383 hp / 403 lb-ft) | 🧠 Tech can feel dated vs newer luxury SUVs |
🗓️ Maintenance Schedule (Owner-Friendly Table)
| Interval | What to Do | Notes |
|---|---|---|
| Every 5,000 mi / 8,000 km | 🛢️ Oil & filter; inspect brakes, tires, fluids | Short trips/towing/off-road: do this religiously |
| Every 15,000 mi / 24,000 km | 🧹 Cabin air filter; rotate tires; inspect suspension/steering | Watch tire wear—alignment matters on heavy SUVs |
| Every 30,000 mi / 48,000 km | 🧯 Engine air filter; brake fluid check; driveline grease/service | Driveline service can prevent clunks |
| Every 50,000 mi / 80,000 km | 🧪 Coolant check; inspect radiator/water pump; belts/hoses | Address early seepage before overheating risk |
| Every 60,000 mi / 96,000 km | ⚙️ Transmission fluid (severity-based); diff/transfer fluids | Towing/off-road = shorter intervals |
| Every 100,000 mi / 160,000 km | 🔧 Spark plugs; thorough cooling system review | Pair with intake/PCV inspection if needed |
✅ Best practice: match intervals to your driving severity (towing, idling, extreme temps, off-road, short trips). Always defer to your owner’s manual for your market/VIN.
🥊 Top 5 Competitors
- 🟫 Toyota Land Cruiser (200 Series era): Land Cruiser/LX platform wiring reference (OEM diagrams) ↗
- 🟥 Infiniti QX80: 2014 Infiniti QX80 Repair Manual (OEM PDF) ↗
- 🟩 Range Rover Sport: 2013–2016 Range Rover Sport Repair Manual (L494) ↗
- 🟦 GMC Yukon (Escalade sibling market): 2014–2019 GMC Yukon Repair Manua ↗
- ⚫ Audi Q7: 2016–2022 Audi Q7 Repair Manual ↗
🚨 Top 10 Recalls, Advisories & TSB/Service Campaign Highlights (Verify by VIN)
Recalls and campaigns are VIN-specific and vary by country. Always confirm status using official recall tools (NHTSA/Transport USA/Lexus, Canada/Lexus).
- Passenger airbag deactivation risk (seat belt tension sensor harness) (NHTSA 18V-887)
What happens: Wire harness can break, potentially deactivating passenger airbags and illuminating warning lights.
Remedy: Dealer replaces/updates seatbelt assembly components. - Fuel pump impeller defect (stall risk) (NHTSA 20V-682 / Lexus campaigns often referenced as 20LA01/20TA02)
What happens: Certain Denso fuel pumps may fail → engine stall.
Remedy: Fuel pump replacement per campaign instructions (VIN-dependent). - Fuel pump recall population updates/owner notices
What happens: Some vehicles were initially included “out of caution” and later removed based on investigation results (VIN-dependent). - Lexus Canada recall communication (LX listed in Canada recall notice)
Highlights: Toyota/Lexus Canada issued recall communications that include Lexus LX model-year populations (check VIN). - Data Communication Module (DCM) service campaign (connectivity/telematics reprogram)
What happens: Reprogramming may be required to address module behavior; campaign availability has an end date.
Remedy: Dealer reflash/reprogram at no charge (when applicable). : - Campaign matrix/coverage references for LX 570 safety recall (internal Lexus campaign docs)
What happens: Dealer campaign documentation references LX 570 recall eligibility and training/certification requirements. - Seat belt / airbag status light warnings (related to 18V-887 condition)
What happens: Airbag warning light and passenger airbag OFF indicator may appear if the circuit opens. - Owner advisory: always run recall lookup by VIN before buying used
Why: LX recall/campaign applicability depends on production batch and region. - General OEM recall portal guidance (Canada)
Lexus specifically calls out that recall tools include Takata airbag campaigns (model/VIN dependent). - Practical service guidance: complete open recalls during appointments
Dealer campaign instructions emphasize performing open recalls/campaigns during service visits.
⚠️ Notes: Items above mix formal recalls and service-campaign highlights pulled from official recall/campaign documents.
🧠 DTC Trouble Codes
🧩 Engine Control Module (ECM)
| DTC | What It Means | Likely Root Cause | Recommended Fix |
|---|---|---|---|
| P0300 | Random/Multiple Cylinder Misfire | Ignition, fuel, vacuum leak | Scan live misfire data; plugs/coils; smoke test; fuel trim diagnosis |
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) | Aging catalyst, exhaust leak, O2 sensor drift | Check leaks; verify O2 waveforms; address misfires; replace catalyst if confirmed |
| P0430 | Catalyst Efficiency Below Threshold (Bank 2) | Same as above | Same diagnostic path as P0420 |
| P0171 | System Too Lean (Bank 1) | Vacuum leak, MAF issue, fuel delivery | Smoke test; clean/test MAF; fuel pressure test; injector balance |
| P0174 | System Too Lean (Bank 2) | Vacuum leak, MAF issue, fuel delivery | Same as P0171; confirm bank-specific clues |
| P0455 | EVAP Large Leak | Loose cap, cracked hose, purge/vent issue | Smoke EVAP; check cap seal; test purge/vent valves |
| P0441 | EVAP Incorrect Purge Flow | Purge valve stuck, hose routing | Command purge with scan tool; replace valve if stuck |
| P2195 | O2 Sensor Stuck Lean (B1S1) | Sensor drift, wiring, exhaust leak | Inspect wiring; check for leaks; replace sensor if confirmed |
| P0128 | Coolant Thermostat Below Regulating Temp | Thermostat stuck open, low coolant | Fix leaks; replace thermostat; bleed system correctly |
| P1604 | Startability Malfunction | Low battery/voltage events, fuel/air issues | Battery/charging test; review freeze-frame; diagnose related fuel/air codes |
⚙️ Transmission Control Module (TCM)
| DTC | What It Means | Likely Root Cause | Recommended Fix |
|---|---|---|---|
| P0700 | Transmission Control System (MIL Request) | TCM stored fault | Read manufacturer-specific TCM codes; diagnose underlying cause |
| P0717 | Input/Turbine Speed Sensor No Signal | Sensor failure, wiring | Check harness; scope sensor; replace if confirmed |
| P0722 | Output Speed Sensor No Signal | Sensor failure, wiring | Inspect sensor/harness; verify with scan tool and scope |
| P0730 | Incorrect Gear Ratio | Low fluid, clutch slip, solenoid issues | Check fluid level/condition; adaptation reset; pressure tests if needed |
| P0741 | TCC Performance/Stuck Off | Torque converter clutch control, solenoid | Verify slip with data; fluid service; solenoid/valve body checks |
| P0776 | Pressure Control Solenoid Performance | Solenoid/valve body wear, debris | Fluid inspection; pan debris check; solenoid tests; repair valve body |
| P2714 | Pressure Control Solenoid “D” Performance | Hydraulic control issue | Electrical checks; hydraulic diagnosis; repair as indicated |
| P2757 | TCC Pressure Control Solenoid | Solenoid, wiring, valve body | Command tests; resistance; valve body service |
| P0796 | Pressure Control Solenoid “C” Performance | Solenoid/valve body | Fluid + electrical + hydraulic checks |
| P0894 | Transmission Component Slipping | Worn clutches, low pressure | Confirm with data; pressure tests; rebuild/repair if necessary |
🛑 ABS / ESC (Brake System)
| DTC | What It Means | Likely Root Cause | Recommended Fix |
|---|---|---|---|
| C0200 | Front Right Wheel Speed Sensor Signal | Sensor, tone ring, wiring | Inspect sensor gap; check harness; replace sensor if faulty |
| C0205 | Front Left Wheel Speed Sensor Signal | Sensor, tone ring, wiring | Same as above |
| C0210 | Rear Right Wheel Speed Sensor Signal | Sensor, tone ring, wiring | Same as above |
| C0215 | Rear Left Wheel Speed Sensor Signal | Sensor, tone ring, wiring | Same as above |
| C1241 | Low Battery Positive Voltage | Weak battery/charging | Battery + alternator test; clean grounds |
| C1256 | Accumulator Low Pressure | Hydraulic unit/pressure issues | Confirm with scan data; inspect brake hydraulics; service as required |
| C1336 | Zero Point Calibration Undone | Calibration lost after alignment/battery | Perform zero-point calibration with proper procedure/tool |
| C1201 | Engine Control System Malfunction | ECM fault triggers VSC | Fix engine codes first; clear and re-evaluate |
| C1441 | Yaw Rate Sensor Output | Sensor calibration/sensor issue | Calibrate; verify sensor values; replace if necessary |
| C1300 | ABS ECU Malfunction | ECU/power/ground | Check power/ground; connector; ECU replacement if confirmed |
🎈 SRS Airbag System
| DTC | What It Means | Likely Root Cause | Recommended Fix |
|---|---|---|---|
| B1801 | Driver Airbag Squib Circuit | Clock spring, connector, wiring | Inspect clock spring; SRS connectors; repair wiring |
| B1811 | Passenger Airbag Squib Circuit | Connector/wiring, module | Check connectors under dash; verify resistance per spec |
| B1650 | Occupant Classification System Malfunction | Seat sensor/calibration | Calibrate OCS; inspect seat wiring |
| B1785 | Side Airbag Circuit | Seat-side wiring/connector | Inspect seat harness; repair/replace |
| B1795 | Curtain Shield Airbag Circuit | Harness/connector in pillar/roof | Inspect connectors; repair wiring; replace module if required |
| B1000 | SRS ECU Malfunction | ECU internal fault/power | Check power/ground; replace ECU if confirmed |
| B1100 | Airbag Sensor Assembly | Sensor module fault | Confirm with scan tool; replace module if necessary |
| B1150 | Front Impact Sensor | Sensor damage/corrosion | Inspect sensor; replace if faulty |
| B1180 | Seat Belt Pretensioner Circuit | Pretensioner, wiring | Inspect pretensioner connectors; replace if needed |
| B1647 | Passenger Seat Belt Tension Sensor | Harness fatigue/break risk (related campaigns) | Inspect/repair; verify recall completion where applicable |
📡 Body Control / CAN Communication
| DTC | What It Means | Likely Root Cause | Recommended Fix |
|---|---|---|---|
| U0100 | Lost Communication With ECM/PCM | CAN issue, low voltage | Battery test; inspect CAN wiring/connectors; check grounds |
| U0121 | Lost Communication With ABS | CAN/power/ground to ABS | Verify ABS power/ground; CAN continuity; repair wiring |
| U0140 | Lost Communication With Body Control Module | BCM power/ground or CAN | Check fuses/grounds; connector integrity; module diagnosis |
| U0155 | Lost Communication With Instrument Cluster | Cluster power/CAN | Check cluster supply; CAN; connector seating |
| U0184 | Lost Communication With Radio | Infotainment network fault | Check radio power/ground; network hub; reflash/update |
| B1241 | Body ECU Low Voltage | Battery/charging issues | Load-test battery; alternator output; clean grounds |
| B2312 | Door Lock Circuit | Actuator or wiring | Test actuator; check wiring; replace actuator |
| B2321 | Back Door / Hatch Switch | Switch failure, harness strain | Test switch; repair harness; replace switch |
| B2799 | Immobilizer Malfunction | Key registration, antenna, ECU | Try spare key; scan immobilizer; re-register keys |
| U0073 | Control Module Communication Bus Off | CAN short/open, module pulling bus down | Isolate modules; inspect CAN wiring; repair short/open |
🧠 DTC tip: A “U-code storm” often starts with low voltage. Test the battery + charging system first before chasing network ghosts.
🏆 Final Verdict
If you want a luxury SUV that’s still built like a “real truck”, the 2014–2018 LX 570 is one of the last of its kind. The drivetrain fundamentals are strong, the cabin is genuinely premium, and the platform is proven. The tradeoffs are predictable: fuel economy, aging luxury electronics, and potentially expensive suspension/cooling/brake-related repairs as mileage climbs.
