2014-2019 Subaru Legacy & Outback Wiring Diagram

2014–2019 Subaru Legacy & Outback OEM Wiring Diagram Manual – PDF Download

This is the original OEM workshop electrical manual for the 2014–2019 Subaru Legacy and Outback, delivered in a simple and user-friendly PDF format. It includes all factory-approved wiring diagrams and circuit layouts used by authorized Subaru dealership technicians for accurate electrical diagnostics and repairs.

🔧 Key Features:

• ✅ Complete electrical wiring diagrams for all major systems
• ✅ Clear and detailed circuit schematics and layouts
• ✅ Covers lighting, power distribution, sensors, ECU connections, and more
• ✅ OEM-approved data – exact same information used by Subaru technicians
• ✅ Fully searchable and printable PDF file for easy navigation

⚙️ Vehicle Compatibility:

• Make: Subaru
• Models: Legacy & Outback
• Years Covered: 2014–2019

💡 Why Choose This Manual?

• ✔ Official Subaru OEM wiring diagrams
• ✔ Trusted by professionals for accurate repairs
• ✔ One-time purchase – no recurring fees or subscriptions
• ✔ Ideal for DIY electrical work and advanced diagnostics

Delivery: Instant Digital PDF Download
Compatibility: Works on Windows, macOS, iOS, Android

Table of Contents: 2014-2019 Subaru Legacy & Outback Wiring Diagram

Sample Pages

2014–2019 Subaru Legacy & Outback: Comprehensive Guide

Overview

The 2014–2019 Subaru Legacy (sedan) and Outback (wagon/crossover) represent the sixth generation of these popular models. Both share the same platform and offer Subaru’s renowned all-wheel-drive system as standard equipment.

Key Features

• Symmetrical All-Wheel Drive standard on all models
• Available EyeSight driver assistance technology (became standard on many trims by 2019)
• Spacious interiors with high-quality materials
• Strong safety ratings (IIHS Top Safety Pick)
• Excellent visibility and practicality

Technical Specifications

2014–2019 Subaru Legacy

2014–2019 Subaru Outback

Trim Levels (Legacy): 2.5i, 2.5i Premium, 2.5i Limited, 2.5i Sport, 3.6R Limited

Trim Levels (Outback): 2.5i, 2.5i Premium, 2.5i Limited, 3.6R Limited, 3.6R Touring

Top 10 Mechanical & Electrical Issues

1. CVT Transmission Judder/Shuddering

Symptoms:

• Vibration or shuddering during acceleration (especially 15–40 mph)
• Hesitation when accelerating from a stop
• Rough shifting sensations

Root Cause:

• Torque converter issues with the CVT
• Worn CVT fluid or internal clutch pack degradation
• Software calibration issues

Fix:

• CVT fluid replacement with Subaru-approved fluid
• Software updates/reflash of transmission control module
• In severe cases, torque converter or full CVT replacement

Cost:

• Fluid change: $150–$300
• Software update: $0–$150
• Torque converter: $1,500–$2,500
• CVT replacement: $4,000–$8,000

2. Head Gasket Leaks (2.5L Engine)

Symptoms:

• External oil leaks around cylinder heads
• Coolant loss without visible leaks
• White smoke from exhaust
• Overheating

Root Cause:

• Design flaw in head gasket material on some FB25 engines
• Thermal cycling causing gasket degradation
• Less common than older EJ25 engines but still occurs

Fix:

• Head gasket replacement
• Cylinder head resurfacing if warped
• Timing components replacement during repair

Cost:

• $2,000–$3,500 (labor-intensive job)

3. Excessive Oil Consumption

Symptoms:

• Low oil level warnings
• Needing to add 1+ quarts between oil changes
• Blue smoke from exhaust under acceleration
• Check engine light (P0011, P0021 codes)

Root Cause:

• Piston ring design issues on early FB25 engines (primarily 2011–2014)
• Oil control rings not seating properly
• PCV system issues

Fix:

• Short-block replacement under warranty/extended warranty
• PCV valve replacement
• More frequent oil changes to slow consumption

Cost:

• PCV valve: $50–$150
• Short-block replacement: $5,000–$7,000 (often covered under Subaru’s extended warranty for affected vehicles)

4. Infotainment System Freezing/Malfunctioning

Symptoms:

• Touchscreen unresponsive or frozen
• Backup camera not displaying
• Bluetooth connectivity issues
• Radio or navigation system crashes

Root Cause:

• Software bugs in Starlink infotainment system
• Overheating of head unit
• Corrupted system files

Fix:

• System reboot (hold power button for 15+ seconds)
• Software updates from dealer
• Head unit replacement in severe cases

Cost:

• Software update: $0–$150
• Head unit replacement: $800–$1,500

5. Brake Light Switch Failure

Symptoms:

• Brake lights not working
• Cruise control not functioning
• Push-button start issues
• Shift lock (unable to shift out of Park)

Root Cause:

• Faulty brake light switch (common failure point)
• Electrical connector corrosion
• Switch misalignment

Fix:

• Replace brake light switch
• Adjust/clean electrical connectors

Cost:

• $50–$200 (parts + labor)

6. Windshield Wiper Motor/Linkage Failure

Symptoms:

• Wipers moving slowly or erratically
• Wipers stopping in middle of windshield
• Grinding or clicking noises
• Wipers not parking properly

Root Cause:

• Wiper motor wear
• Linkage bushing deterioration
• Water intrusion into motor assembly

Fix:

• Replace wiper motor
• Replace linkage assembly and bushings
• Clean and lubricate mechanism

Cost:

• $150–$400 (motor)
• $200–$500 (linkage assembly)

7. Wheel Bearing Failure

Symptoms:

• Humming or grinding noise that increases with speed
• Noise changes with turning
• Vibration in steering wheel
• ABS warning light

Root Cause:

• Normal wear over time
• Water and salt intrusion into bearing seals
• Excessive weight or off-road use (Outback)

Fix:

• Replace wheel bearing hub assembly
• Typically one wheel at a time

Cost:

• $300–$600 per wheel (parts + labor)

8. Air Conditioning Compressor Failure

Symptoms:

• No cold air or intermittent cooling
• Loud squealing or grinding noise from engine bay
• A/C clutch not engaging
• Refrigerant leaks

Root Cause:

• Compressor clutch failure
• Internal compressor wear
• Refrigerant contamination

Fix:

• Replace A/C compressor
• Flush A/C system
• Replace receiver/drier and expansion valve
• Evacuate and recharge system

Cost:

• $800–$1,500

9. Battery Drain Issues

Symptoms:

• Dead battery after sitting overnight or few days
• Electrical accessories staying on
• Parasitic draw
• Difficulty starting

Root Cause:

• Faulty modules staying awake (infotainment, body control module)
• Short circuits in wiring
• Aftermarket accessories
• Battery age (OEM batteries often last only 3–5 years)

Fix:

• Parasitic draw testing to identify faulty circuit
• Software updates to modules
• Replace battery
• Repair wiring issues

Cost:

• Battery: $150–$300
• Diagnosis and repair: $100–$500+

10. Rear Differential Seal Leaks

Symptoms:

• Gear oil puddles under rear of vehicle
• Low differential fluid
• Whining noise from rear differential
• Burning smell

Root Cause:

• Differential seal deterioration
• Normal wear from AWD system operation
• Overfilled differential

Fix:

• Replace rear differential seals
• Refill with proper gear oil
• Inspect for differential damage

Cost:

• $300–$600

Top 5 Competitors

1. Toyota Camry / RAV4 (Legacy / Outback competitors respectively)

• Strengths: Better reliability ratings, lower cost of ownership, better resale value
• Weaknesses: FWD standard (AWD optional on some), less engaging to drive
• Price Range: Similar MSRP

2. Honda Accord / CR-V

• Strengths: Excellent reliability, refined powertrains, spacious interiors
• Weaknesses: FWD standard (AWD on CR-V only recently), less ground clearance than Outback
• Price Range: Comparable

3. Mazda6 / CX-5

• Strengths: More engaging driving dynamics, upscale interiors, better infotainment
• Weaknesses: Smaller cargo space, AWD optional (not standard)
• Price Range: Similar to slightly higher

4. Ford Fusion / Edge

• Strengths: More powerful engine options, spacious cabins, available AWD
• Weaknesses: Lower reliability ratings, discontinued (Fusion ended 2020)
• Price Range: Competitive

5. Volkswagen Passat / Tiguan

• Strengths: Upscale feel, European driving dynamics, available AWD (4Motion)
• Weaknesses: Higher maintenance costs, less reliable, smaller dealer network
• Price Range: Similar to slightly higher

Top 10 Recalls, Advisories & TSB Highlights

Recalls

1. Brake Light Switch Recall (2014-2017)

• Issue: Brake light switch can fail, preventing brake lights from illuminating
• Vehicles: Approximately 650,000 vehicles
• Fix: Free brake light switch replacement at dealers

2. PCV Valve Defect (2012-2017)

• Issue: Faulty PCV valve can cause engine stalling
• Vehicles: Legacy, Outback with 3.6L engine
• Fix: Free PCV valve replacement

3. Steering Column Issue (2015-2018)

• Issue: Steering column can corrode and separate, causing loss of steering
• Vehicles: Legacy, Outback in salt-belt states
• Fix: Steering column inspection and replacement if necessary

4. Fuel Pump Relay (2018-2019)

• Issue: Engine may stall due to fuel pump relay failure
• Vehicles: Limited number of 2018-2019 models
• Fix: Relay replacement

5. Spider Software Update (EyeSight) (2015-2017)

• Issue: Pre-collision braking may activate unnecessarily
• Vehicles: Models equipped with EyeSight
• Fix: Software update

Technical Service Bulletins (TSBs)

6. TSB 02-157-14R: CVT Judder

• Issue: Transmission shudder during light acceleration
• Solution: CVT software update, fluid replacement

7. TSB 15-181-16: Excessive Oil Consumption

• Issue: 2.5L engines consuming excessive oil
• Solution: Short-block replacement under extended warranty

8. TSB 11-145-17: Infotainment System Freeze

• Issue: Touchscreen unresponsive or frozen
• Solution: Software update, possible head unit replacement

9. TSB 03-87-15: Windshield Wiper Issues

• Issue: Wipers skipping or chattering
• Solution: Wiper motor software update, linkage inspection

10. TSB 16-139-15R: Harsh 1-2 Shift (CVT)

• Issue: Hard engagement when shifting into gear
• Solution: CVT software calibration update

Maintenance Schedule

Every 6,000 Miles / 6 Months

• Engine oil and filter change
• Tire rotation
• Brake inspection
• Fluid level checks

Every 12,000 Miles / 12 Months

• Cabin air filter replacement
• Inspect brake pads and rotors
• Check battery condition

Every 24,000 Miles / 24 Months

• Engine air filter replacement
• Inspect CVT fluid condition
• Inspect steering and suspension components

Every 30,000 Miles / 30 Months

• CVT fluid replacement (critical for longevity)
• Fuel filter inspection
• Brake fluid flush
• Coolant inspection

Every 60,000 Miles

• Spark plug replacement
• Rear differential fluid change
• Front differential fluid change
• Inspect drive belts

Every 100,000 Miles

• Timing chain inspection (not replacement unless needed)
• Coolant replacement
• Major fluid flush (all systems)

Note: Severe driving conditions (frequent short trips, extreme temperatures, towing, off-road) may require more frequent service intervals.

10 FAQs for Buyers

1. Are the 2014-2019 Legacy and Outback reliable?

Generally yes, with above-average reliability ratings. The CVT transmission and oil consumption issues are the main concerns. Models from 2016+ with updated engines tend to have fewer problems. Regular CVT fluid changes are critical.

2. Which engine should I choose: 2.5L or 3.6L?

The 2.5L 4-cylinder is adequate for most driving and offers better fuel economy. The 3.6L 6-cylinder provides more power for towing and highway passing but has lower MPG and higher maintenance costs. If you don’t need the extra power, stick with the 2.5L.

3. What is the CVT transmission like?

Subaru’s CVT is smooth and fuel-efficient but has had reliability concerns. Key to longevity: change CVT fluid every 30,000 miles (despite Subaru saying “lifetime fluid”). The transmission can be expensive to replace ($4,000-$8,000).

4. How much can these vehicles tow?

• 2.5L models: 2,700 lbs
• 3.6L models: 3,000 lbs (Outback), 3,500 lbs (Legacy with towing package)

5. What is EyeSight and is it worth it?

EyeSight is Subaru’s suite of driver assistance features including adaptive cruise control, pre-collision braking, and lane-keeping assist. It’s highly recommended and became standard on many trims by 2019. Very effective safety system.

6. Are parts and maintenance expensive?

Moderate. More expensive than Honda/Toyota but less than European brands. AWD components and horizontally-opposed engine design make some repairs more labor-intensive. Budget $500-$800/year for routine maintenance.

7. Which model year is best to buy?

2016-2017 offer the best balance of updated features, resolved early issues, and value. 2018-2019 have newer tech but command higher prices. Avoid early 2014-2015 models with oil consumption issues.

8. What should I check when buying used?

• CVT service history (fluid changes)
• Oil consumption records
• EyeSight system functionality
• Infotainment operation
• Undercarriage rust (if in salt-belt state)
• Recalls completed
• Head gasket condition

9. How does the Outback compare to the Legacy?

The Outback offers more ground clearance (8.7″ vs 5.9″), more cargo space, and a more rugged appearance. The Legacy is more car-like to drive with better fuel economy. Both share mechanicals otherwise.

10. What’s the real-world fuel economy?

• 2.5L: Expect 24-26 mpg combined (city/highway mix)
• 3.6L: Expect 20-23 mpg combined
• Highway cruising can achieve 30+ mpg with the 2.5L

Final Buyer Recommendations

✅ Buy If:

• You need standard AWD for weather/terrain conditions
• You value safety (excellent crash ratings and EyeSight)
• You want a practical, spacious vehicle with good visibility
• You plan to keep up with regular maintenance (especially CVT fluid)
• You’re buying 2016+ models with service records
• You want something more adventurous than a sedan but not a full SUV (Outback)

⚠️ Be Cautious If:

• You’re looking at high-mileage examples (100k+) without CVT service records
• The vehicle has 2014-2015 2.5L engine with unknown oil consumption history
• You want the absolute lowest cost of ownership (Honda/Toyota are cheaper)
• You need to tow regularly over 3,000 lbs
• You’re not willing to spend on 30k-mile CVT fluid changes

❌ Avoid If:

• You don’t need AWD (you’re paying for it in fuel economy and maintenance)
• You want sporty performance (these prioritize comfort and utility)
• You can’t find service records showing CVT fluid changes
• The infotainment is a dealbreaker (2014-2016 systems are dated)

Best Bang for Buck:

2016-2017 Subaru Outback 2.5i Premium with EyeSight

• Updated engine resolving oil consumption issues
• EyeSight safety features
• Good balance of features and value
• Still relatively affordable on used market ($15,000-$22,000 depending on mileage)

What to Pay (2024 Market Estimates):

• 2014-2015: $10,000-$16,000
• 2016-2017: $15,000-$22,000
• 2018-2019: $20,000-$28,000

(Prices vary by mileage, condition, trim, and location)

Our Final Verdict

The 2014-2019 Legacy and Outback are solid, practical vehicles with excellent safety and standard AWD. They’re not as bulletproof as Toyotas or Hondas, but they offer unique advantages for buyers who need all-weather capability. The key to long-term satisfaction is religious maintenance, especially CVT fluid changes every 30,000 miles. Buy from 2016+ with service records, budget for maintenance, and you’ll have a capable, safe vehicle for years to come.