NX 300h – Dardoor https://dardoor.com Auto Service Repair Manuals Tue, 13 May 2025 02:02:27 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://dardoor.com/wp-content/uploads/2020/03/cropped-favicon-32x32.png NX 300h – Dardoor https://dardoor.com 32 32 2014-2020 Lexus NX 300h Wiring Diagram https://dardoor.com/product/2014-2020-lexus-nx-300h-wiring-diagram/ https://dardoor.com/product/2014-2020-lexus-nx-300h-wiring-diagram/#comments Wed, 06 Jul 2022 13:41:25 +0000 https://dardoor.com/?post_type=product&p=22584 original OEM electrical wiring diagrams manual for the 2014-2020 Lexus NX 300h in a convenient PDF format.]]> 2014–2020 Lexus NX 300h OEM Electrical Wiring Diagrams Manual – PDF

Access the original OEM electrical wiring diagrams manual for the Lexus NX 300h (2014–2020) in a convenient PDF format. This manual provides full coverage for both RHD and LHD models, delivering the exact same technical documentation used by Lexus dealership technicians for electrical diagnostics, repairs, and troubleshooting.

File Format PDF
File Language English
You’ll Get 30.6 MB
Page Count 2,426
Delivery Method Instant Download
Searchable & Printable YES

Manual Details:

    • Model: Lexus NX 300h
    • Years Covered: 2014, 2015, 2016, 2017, 2018, 2019, 2020
    • Drive Orientation: Right-Hand Drive (RHD) & Left-Hand Drive (LHD)
    • Chassis Code: AYZ10, AYZ15
    • Engine: 2.5L 2AR-FXE I4 Hybrid (2494 cc)
    • Electrical Manual Reference: EM31A5E
    • Format: High-quality, searchable PDF

Key Features:

✅ Complete OEM Wiring Diagrams
✅ System-by-System Electrical Layouts
✅ Connector Locations & Ground Points
✅ Color-Coded Diagrams (where available)
✅ Fuse & Relay Information
✅ Dealer-Level Accuracy
✅ Printable & Device-Friendly Format

Ensure precise electrical troubleshooting and maintenance for your Lexus NX 300h with this official factory wiring diagram manual. Whether you’re a professional technician or a dedicated DIYer, this manual gives you the tools to do the job right.

📥 Download your Lexus NX 300h Wiring Manual today – trusted by professionals worldwide.

This electrical wiring manual includes the procedures for maintenance, disassembling, reassembling, inspection, and adjustment of electrical components and diagnostics for guidance of experienced technicians. Please peruse and utilize this manual fully to ensure complete repair work to keep your vehicle in optimum condition.

Contents: 2014-2020 Lexus NX 300h Wiring Diagrams

Electric Manual: EM31A5E

  1. Overall Electrical Wiring Diagram
  2. Relay Locations
  3. Electrical Wire Routing
  4. System Wiring Diagram

Sample Pages

CAUTION ↗: This manual is intended for use by individuals with specialized training and proper certification. Attempting repairs or maintenance using only this manual—without the necessary skills, tools, or equipment—may result in serious injury to yourself or others and may also cause significant damage to the vehicle. To ensure safety and prevent vehicle damage, always follow the instructions carefully and use appropriate tools and procedures.

🚗 2014–2020 Lexus NX 300h: Full Owner’s Guide

⚙️ Common Mechanical Issues

🛠️ Problem 📈 Description
Brake Actuator Failure May cause reduced braking efficiency or warning lights.
Suspension Rattle Front strut noise over rough roads; common with high mileage.
HV Battery Cooling Fan Clogging Dust and debris can reduce battery performance over time.
EGR Valve Carbon Build-Up Can lead to poor engine performance and fuel economy loss.

Common Mechanical Issues

1- Hybrid System

    • Battery Degradation:
      • Reduced fuel efficiency or hybrid battery warnings (e.g., “Check Hybrid System”) after 100k+ miles.
      • Fix: Lexus offers a 10-year/150k-mile hybrid battery warranty (varies by region). Reconditioning or replacement costs 3k–3k–8k.
    • Inverter Coolant Pump Failure: Leaks or pump failures trigger warning lights (code P0A93).

2- Engine (2.5L 2AR-FXE Hybrid)

    • Oil Consumption: Some reports of excessive oil use in high-mileage examples.
    • Carbon Buildup: Direct injection can clog intake valves, causing rough idling.

3- Transmission (eCVT)

    • Shuddering/Jerking: Rare, but software updates often resolve shifting issues.

4- Suspension

    • Front Strut Mounts: Clunking noises over bumps due to worn bushings.
    • Control Arm Bushings: Premature wear in colder climates.

5- Brake System

    • Brake Actuator Noise: Humming or buzzing from the regenerative braking system (normal but often mistaken for a fault).

    • Premature Pad Wear: Aggressive regen braking can accelerate wear.

⚡ Common Electrical Issues

💡 Issue 🔍 Details
Infotainment Freezes System lag or complete freeze requiring reset.
TPMS Sensor Faults Premature battery failure or sensor misreads.
Door Lock Actuator Failure Driver or passenger locks may become unresponsive.

Common Electrical Issues

1- Infotainment System

    • Touchpad Frustration: Non-touchscreen interface (pre-2018) is unintuitive.
    • Screen Delamination: Bubbling or peeling displays in early models.

2- Battery Drain

    • 12V Auxiliary Battery Failure: Causes startup issues or warning lights.

3- Sensor Malfunctions

    • Radar/LIDAR Errors: Dirty or misaligned sensors disable safety features (e.g., pre-collision assist).

4- Power Liftgate

    • Motor/Sensor Failures: Intermittent operation in cold weather.

🚀 Performance Overview

🔥 Specification 🔢 Value
Engine 2.5L I4 + Electric Motor (Hybrid)
Total Horsepower 194 hp
0–60 mph 9.1 seconds
Transmission CVT (Electronically Controlled)
Drive Type AWD / FWD
Fuel Economy 33 mpg city / 30 mpg highway

🏆 Main Competitors

✅ Pros and ❌ Cons

✅ Pros ❌ Cons
Excellent fuel economy for an SUV Less cargo space than competitors
Quiet, refined ride quality Slow acceleration for its class
Top-tier Lexus reliability and resale Touchpad infotainment can be frustrating
High-quality interior materials CVT lacks sporty feel

🛣 Maintenance Schedule

🔧 Service ⏰ Interval 📋 Notes
Oil & Filter Change 10,000 miles / 16,000 km Synthetic 0W-20 oil
Coolant Inspection 15,000 miles / 24,000 km Hybrid coolant included
Brake Fluid Flush 30,000 miles / 48,000 km Check for contamination
HV Battery Fan Clean Every 30,000 miles Especially in dusty areas
Spark Plugs 120,000 miles / 192,000 km Iridium plugs
Hybrid System Inspection Every 15,000 miles Battery, inverter, and fan

🚨 Recalls

📣 Recall 🔥 Issue 🔧 Fix
Brake Booster Pump May fail and reduce braking assist Free replacement at dealer
Fuel Delivery Pipe Possible fuel leakage risk Inspect and replace pipe
Pre-Collision System Error False alerts or deactivation Reprogram radar module

Key Recalls

    • Takata Airbag Inflators: NHTSA 16V-356 (2014–2016 models; rupture risk).
    • Fuel Pump Failure: NHTSA 20V-373 (2018–2020 models; stalling risk).
    • Hybrid Inverter Coolant Pump: Lexus TSB 0093-18 addresses leaks.

🛠️ Technical Service Bulletins (TSBs)

TSB ID Issue Resolution
L-TT-0316-20 Infotainment software bugs Software patch update
CP-BRP-1019 Brake noise under light pedal use Replace front pad set
EG066-17 Rough idle with cold start ECU reflash with updated calibration

Recommendations

  1. Hybrid Battery Health:
    • Test battery state-of-health (SOH) via Lexus dealer before warranty expires.
    • Avoid prolonged parking at full/empty charge.
  2. Maintenance Tips:
    • Use 0W-20 synthetic oil and change every 5k–7k miles.
    • Clean intake valves (walnut blasting) every 60k miles to prevent carbon buildup.
  3. Pre-Purchase Inspection:
    • Scan for hybrid system codes (e.g., P0A80 for battery failure).
    • Test all safety features (adaptive cruise, lane assist).
  4. Address Recalls:

Reliability Note

The NX 300h is one of Lexus’ most reliable hybrids, but its complexity demands:

    • Proactive maintenance (especially hybrid battery care).
    • CPO (Certified Pre-Owned) warranty for peace of mind.
    • Avoid modified or neglected examples.

Best Model Years: 2018–2020 (refreshed infotainment, fewer reported issues).
Weak Point: Hybrid battery replacement costs post-warranty.
Strength: Consistently achieves 30+ MPG with premium comfort.

Pro Tip: Budget 1.5k–1.5k–3k annually for maintenance/repairs on high-mileage examples. Prioritize models with detailed service records.

📚 References

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