2014–2020 Lexus IS Series Wiring Diagram | OEM Electrical Workshop Manual PDF

File Format	PDF
File Language	English
You’ll Get	66 MB
Page Count	5,216
Delivery Method	Instant Download
Searchable & Printable	YES

This is the original OEM Workshop Electrical Manual for the 2014–2020 Lexus IS Series, including IS 350, IS 300, IS 250, and IS 200t models. It covers both Right-Hand Drive (RHD) and Left-Hand Drive (LHD) configurations, and is available in a convenient and easy-to-use PDF format.This manual provides detailed electrical wiring diagrams, connector views, ground point illustrations, fuse and relay locations, and circuit explanations—ideal for professionals and DIY technicians working on electrical diagnostics and repairs.

Table of Contents

Electrical Manual Reference Numbers:

EM30H6E
EM30H5E

Generation / Chassis Code:

AVE30 – Lexus IS Third Generation

Engine Coverage:

2.0 L 8AR-FTS I4-T (ASE30 – IS 200t / IS 300)
2.5 L 4GR-FSE V6 (GSE30 / GSE35 – IS 250)
3.5 L 2GR-FSE V6 (GSE37 – IS 300 AWD)
3.5 L 2GR-FKS V6 (GSE31 / GSE36 – IS 350)

Key Features:

✔️ Full wiring diagrams and circuit schematics
✔️ Includes fuse & relay locations, ground points, and connector views
✔️ Covers hybrid and gasoline variants
✔️ Manufacturer-approved content used by Lexus dealership technicians
✔️ Suitable for both RHD and LHD models

Benefits:

✅ Accurate troubleshooting and repair guidance
✅ OEM-standard information at your fingertips
✅ Fully searchable and printable PDF
✅ Compatible with PC, Mac, tablet, and mobile devices

This manual provides detailed instructions for maintenance, disassembly, reassembly, component inspection, adjustment, and diagnostics—intended for use by experienced mechanics. Proper application of this guide will help ensure thorough repairs and maintain your vehicle in peak condition.

Important Note: Before purchasing this manual, please check whether your vehicle is subject to any active service recalls, as authorized dealerships may perform necessary repairs free of charge. When replacing parts, always use genuine OEM components to ensure safety, reliability, and long-term performance.

Contents: 2014-2020 Lexus IS Series Wiring Diagram (350 IS 300 IS 250 IS 200t)

1- Electric Manual: EM30H6E

Overall Electrical Wiring Diagram
Relay Locations
Electrical Wire Routing
System Wiring Diagram

2- Electric Manual: EM30H5E

Overall Electrical Wiring Diagram
Relay Locations
Electrical Wire Routing
System Wiring Diagram

Sample Pages

CAUTION: This OEM service and workshop repair manual provides detailed procedures for maintenance, disassembly, reassembly, inspection, adjustment, and diagnostics. It is intended as a comprehensive guide for experienced mechanics. To ensure thorough and accurate repairs that maintain your vehicle’s optimal performance, please read and follow this manual carefully. When replacing parts during any repair work, always use genuine Lexus parts to ensure quality, safety, and reliability.

🚗 2014–2020 Lexus IS Series – Full Review, Specs, Issues, Maintenance & DTC Codes

⚙️ Technical Specifications & Performance

- Models: IS 200t, IS 250, IS 300, IS 350
- Engines:
  - 2.0L Turbo I4 (8AR-FTS)
  - 2.5L V6 (4GR-FSE)
  - 3.5L V6 (2GR-FSE / 2GR-FKS)
- Transmission: 6-speed or 8-speed automatic (RWD/AWD)
- Drivetrain: Rear-Wheel Drive or All-Wheel Drive
- Horsepower: 241–311 hp
- Torque: 258–280 lb-ft
- Fuel Economy: 19–30 MPG combined
- 0–60 mph: 5.6–7.0 seconds

🔧 Top 10 Common Mechanical Issues

1. 1. Carbon buildup on direct-injection engines
  2. Oil leaks from timing cover or valve cover gasket
  3. Water pump failure
  4. Premature brake rotor wear
  5. Suspension clunks or bushing wear
  6. Coolant leaks from radiator or water outlet
  7. Rough idle due to dirty MAF or throttle body
  8. Exhaust rattle at startup
  9. Engine misfires on cold start
  10. Steering rack or EPS noise

💡 Top 10 Common Electrical Issues

1. Infotainment system freezing or lagging
2. Navigation display going blank
3. Backup camera delay or failure
4. Mark Levinson amp failure (if equipped)
5. Door lock actuator failures
6. Battery drain from SmartKey system
7. Instrument cluster flickering
8. Power mirror memory malfunction
9. Check engine light due to EVAP leak
10. Parking sensors giving false alerts

🚗 Top Competitors

📊 Pros and Cons

Pros 👍	Cons 👎
Luxurious and quiet ride	Limited rear-seat space
High-quality interior materials	Infotainment touchpad interface is awkward
Strong V6 performance	Average fuel economy
Excellent safety features	Trunk space is small
Top-notch reliability	Somewhat dated design in later years

🛠️ Maintenance Schedule

Service Interval ⏱️	Maintenance Task 🛠️
Every 5,000 miles	Oil & filter change, tire rotation, fluid check
Every 10,000 miles	Brake inspection, cabin air filter
Every 20,000 miles	Engine air filter, inspect belts
Every 30,000 miles	Coolant and transmission fluid check
Every 60,000 miles	Spark plugs, brake fluid, coolant service

📢 Recalls, Safety Alerts & Technical Bulletins

Recall: 2014–2017 IS – Fuel pump may fail causing stall
Recall: 2015–2020 IS – Takata airbag inflator recall
TSB: ECU software update for improved throttle response
Safety Alert: EPS wiring connector corrosion risk

🧾 DTC Trouble Codes

🚗 Engine Control Module (ECM)

DTC Code	Description
P0300	Random/Multiple Cylinder Misfire
P0171	System Too Lean (Bank 1)
P0172	System Too Rich (Bank 1)
P0420	Catalyst Efficiency Below Threshold
P0113	Intake Air Temp Sensor Circuit High
P0128	Coolant Thermostat Below Reg Temp
P2195	O2 Sensor Signal Stuck Lean
P0455	EVAP System Gross Leak Detected
P0441	EVAP Incorrect Purge Flow
P0505	Idle Air Control System Malfunction

⚙️ Transmission Control Module (TCM)

DTC Code	Description
P0700	Transmission Control System Malfunction
P2714	Pressure Control Solenoid D Performance
P0776	Pressure Control Solenoid B Performance
P0720	Output Speed Sensor Circuit
P0715	Input/Turbine Speed Sensor
P0746	Pressure Control Solenoid A
P0751	Shift Solenoid A Performance
P2767	Input/Turbine Speed Sensor No Signal
P2797	Torque Converter Clutch Pressure Control
P2820	Pressure Control Solenoid G Performance

🛑 ABS / ESC System

DTC Code	Description
C1241	Low Battery Positive Voltage
C0210	Right Rear Wheel Speed Sensor Signal
C1223	ABS Control System Malfunction
C0278	ABS Solenoid Relay
C1401	Rear Speed Sensor LH Circuit
C1433	Yaw Rate Sensor Malfunction
C1300	ABS Pump Motor Relay
C1421	Yaw Sensor Zero Point Malfunction
C1248	Brake Booster Pump Motor
C1290	Brake Control System Fault

🎈 SRS Airbag System

DTC Code	Description
B0101	Open in Driver Side Squib Circuit
B0111	Open in Passenger Side Squib Circuit
B1650	Airbag System Malfunction
B1801	Driver Airbag Circuit Resistance High
B1811	Passenger Airbag Resistance High
B1901	Driver Seatbelt Pretensioner Circuit
B1911	Passenger Seatbelt Pretensioner Circuit
B1100	Occupant Detection System Fault
B1210	Crash Sensor Malfunction
B1660	Center Airbag Sensor Assembly

🧠 Body Control / CAN Communication

DTC Code	Description
U0100	Lost Comm With ECM/PCM
U0129	Lost Comm With Brake System
U0140	Lost Comm With Body Control Module
B124D	GPS Antenna Disconnected
B1271	Mirror Position Sensor Malfunction
B1324	Power Seat ECU Communication Error
B1421	Solar Sensor Circuit Fault
B2274	Smart Key Communication Fault
U0155	Lost Comm With Instrument Cluster
B1662	CAN Bus Communication Error

✅ Final Verdict

The 2014–2020 Lexus IS Series is a refined, luxury compact sedan that excels in reliability, comfort, and understated style. While its infotainment and trunk space may fall short of German rivals, its quiet cabin, robust V6 performance, and dependable engineering make it a smart long-term investment for premium sedan seekers.

Brands	Lexus
File Format	PDF
File Language	English
You'll Get	66 MB
Page Count	5,216
Instant Download	YES
Delivery Method	Instant Fast Download Speed (The download link will appear on the checkout page after payment is complete)
Indexed	YES
Permissions	All Permissions, No Password Protected
Searchable & Printable	YES

2014-2020 Lexus IS Series Wiring Diagram