2009 Lexus IS F Cruise Control Isn't Working

Fixing Cruise Control Issues in 2009 Lexus IS F

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2009 Lexus IS F cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2009 Lexus IS F cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2009 Lexus IS F?

When troubleshooting the non-functional cruise control in a 2009 Lexus IS F, it's crucial to follow a structured diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by examining the cruise control fuse located in the fuse box, as a blown fuse is a common culprit that can easily be replaced. Next, take a close look at the cruise control buttons on the steering wheel; ensure they are not stuck or damaged, as this can prevent the system from engaging properly. After that, verify the operation of the speed sensor, since a malfunctioning sensor can disrupt the cruise control's functionality. Utilizing a diagnostic scanner to check for any error codes can also provide insights into potential problems within the system. Additionally, confirm that the brake lights are working correctly, as a malfunctioning brake light switch can inhibit cruise control activation. Lastly, inspect the vacuum lines for any signs of leaks or damage, as these can significantly impact the system's performance. By systematically addressing these areas, you can effectively identify and potentially resolve the cruise control issue in your Lexus IS F.

What are the common problems that could cause the cruise control to stop working in a 2009 Lexus IS F?

When troubleshooting the cruise control system in a 2009 Lexus IS F, it's essential to consider several common problems that could be affecting its functionality. One of the primary culprits is a faulty cruise control switch, which may prevent the system from engaging or disengaging as intended. Additionally, a blown fuse can disrupt the electrical flow necessary for the cruise control to operate, leading to complete failure. Another critical component is the speed sensor; if this sensor is defective, it can hinder the cruise control's ability to maintain a consistent speed. Furthermore, vacuum leaks within the system can significantly impact performance, causing the cruise control to malfunction. It's also important to check the brake light switch, as issues here can prevent the cruise control from activating altogether. Lastly, a malfunctioning throttle cable can interfere with the system's operation, making it crucial to inspect this component as well. By systematically examining these potential issues, you can effectively diagnose and address the problems with your cruise control system.

How urgent is the repair for the non-functioning cruise control in a 2009 Lexus IS F?

When assessing the urgency of repairing a non-functioning cruise control in a 2009 Lexus IS F, it is essential to recognize that while this issue may not pose an immediate safety threat, it should not be overlooked. The cruise control system, while primarily a convenience feature, can indicate underlying electrical problems that might affect other critical vehicle systems. Ignoring the malfunction could lead to more significant issues down the line, potentially compromising safety. Additionally, for those who frequently utilize cruise control, the lack of this feature can lead to increased driver fatigue during long trips, making timely repairs more desirable for comfort. Furthermore, addressing the malfunction promptly can help maintain the vehicle's resale value, as prospective buyers may be deterred by unresolved issues. Therefore, while the urgency may vary based on individual circumstances, consulting a qualified mechanic for a thorough diagnostic assessment is advisable to ensure that any underlying problems are identified and addressed before they escalate.

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