2014 Lexus Is350 Common Problems And Solutions: Fixes For Every Known Issue
The 2014 Lexus IS350 offers a compelling blend of smooth performance, refined luxury, and dependable engineering, yet like any complex machine, it is not without its quirks. This model year, in particular, has seen owners report a handful of recurring issues ranging from infotainment glitches to suspension concerns. By understanding these common problems and their practical solutions, owners can maintain the vehicle's renowned reliability and preserve its resale value. Below is a detailed breakdown of the most frequently cited issues and how to address them effectively.
Among the most frequently mentioned issues by 2014 IS350 owners is the infotainment system's occasional instability. The navigation and audio controls, managed through the central touchscreen, can become sluggish, unresponsive, or even freeze entirely. This is not a critical safety issue, but it can be a significant source of frustration on longer drives.
The root cause is often attributed to software glitches within the Navigation Audio Control Unit (NACU). Over time, software corruption or simply the system's processing load can lead to these unresponsiveness episodes. A simple reset often resolves the issue.
To perform a system reset:
1. Turn the ignition to the "ON" position, ensuring the engine is not running.
2. Locate the "EJECT" button on the front of the head unit.
3. Press and hold the "EJECT" button while simultaneously pressing the power button on the touchscreen.
4. Continue holding both buttons for approximately 10-15 seconds until the system powers off and reboots.
If a reset does not work, a factory reset may be required. This can typically be accessed through the on-screen menu, but be warned that this will erase any personalized settings, paired Bluetooth devices, and radio presets. For persistent hardware faults, such as a failing touchscreen or radio module, visiting a Lexus dealer for diagnostic testing and potential replacement is the recommended course of action.
Another common complaint among 2014 model year owners pertains to the automatic transmission's behavior. Some drivers have reported a harsh or delayed engagement when moving from "Park" to "Drive" or "Reverse." Additionally, instances of the transmission slipping between gears or momentarily losing pressure have been noted, particularly as the vehicle ages.
These symptoms can stem from a variety of sources, ranging from low or contaminated transmission fluid to more serious internal wear. Transmission fluid in this model should be changed regularly according to the Lexus maintenance schedule, but more importantly, it must be the correct type. Using the wrong fluid can lead to poor shifting performance and damage to the solenoids and clutches inside the transmission.
If you are experiencing transmission issues, follow this troubleshooting checklist:
1. **Check Fluid Level and Condition:** With the engine running and warm, use the dipstick to check the fluid level. It should be at the "Full" or "Hot" mark. The fluid itself should be a bright red color and smell sweet. Dark brown, black, or burnt-smelling fluid indicates contamination and requires a flush and refill.
2. **Scan for Error Codes:** Use an OBD-II scanner to check for any stored diagnostic trouble codes (DTCs). Codes related to the transmission (P0700-series) can provide a vital clue about whether the issue is electrical, mechanical, or software-related.
3. **Professional Diagnosis:** Given the complexity of the Aisin Warner automatic transmission used in this vehicle, a slipping or harsh shift often requires professional attention. A mechanic can perform a pressure test to determine if the issue is with the pump, solenoids, or internal bands and clutches.
The 2014 IS350's sophisticated suspension, designed for a balance of comfort and sporty handling, is not immune to problems. One of the more concerning issues reported is oil leakage from the front struts or bearings. A small amount of surface oil is normal, but a persistent drip or a visible pool of fluid under the vehicle is a sign of a failing strut or bearing.
Worn strut bearings can also produce a distinct "clunking" or "knocking" noise, especially when driving over uneven road surfaces, potholes, or during low-speed turns. Ignoring these symptoms can lead to uneven tire wear and a noticeable decline in handling and ride quality.
Addressing suspension issues promptly is crucial for safety and vehicle integrity.
- **Inspection:** During routine oil changes or inspections, ask the mechanic to check the struts and bearings for any signs of leakage or excessive play.
- **Replacement:** If a strut or bearing is found to be leaking or worn, the repair involves replacing the entire strut assembly. This is a job best left to a professional, as it requires specialized tools to safely compress the strut spring and align the new components correctly. While the cost can be significant, replacing a failing strut promptly prevents further damage to other steering and suspension components.
Beyond the major mechanical and electronic systems, 2014 IS350 owners have encountered more minor but bothersome electrical gremlins. These can include dashboard warning lights that illuminate intermittently, power window malfunctions, or interior lights that fail to turn off completely, leading to a dead battery.
These issues are often the result of a failing switch, a corroded connector, or a problem with the vehicle's Body Control Module (BCM). Diagnosing an electrical problem can be a process of elimination.
A systematic approach to diagnosing electrical issues includes:
1. **Check Fuses:** Consult the owner's manual to locate the fuse box and inspect the relevant fuses for continuity. A blown fuse is the simplest explanation for many electrical faults.
2. **Inspect Connectors:** Corrosion at the back of a switch or sensor can interrupt the electrical signal. Carefully disconnecting and inspecting connectors for greenish corrosion or bent pins can reveal the problem.
3. **Professional Tools:** For issues involving the BCM or complex wiring harnesses, a mechanic with a digital multimeter and access to Lexus-specific diagnostic software is essential to trace the electrical path and identify the fault.
While the 2014 Lexus IS350 is a well-built vehicle, proactive maintenance is the best defense against these common problems. Adhering to the recommended service intervals for oil changes, transmission fluid, and brake fluid is paramount. Using high-quality replacement parts, especially for critical components like struts and bearings, can also prevent premature failure.
For owners facing persistent issues, the dealership remains the most authoritative resource. As a representative from Lexus of Scottsdale noted, "The factory service department has access to Technical Service Bulletins (TSBs) that provide engineers' insights into known problems and approved repair procedures. This is invaluable for resolving issues that might stump an independent mechanic." Leveraging this expertise can often lead to a more permanent and reliable fix.
