Lexus LS600h Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Lexus LS600h and How to Fix Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Lexus LS600h 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 Lexus LS600h 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.

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.

Troubleshooting Cruise Control Issues in a Lexus LS600h

When troubleshooting cruise control issues in your Lexus LS600h, it's essential to adopt a methodical diagnostic approach. Start by checking the cruise control system fuse, as a blown fuse is a straightforward fix that can often resolve the problem. Next, inspect the cruise control switch located on the steering wheel; a malfunctioning switch can prevent the system from activating properly. If these initial checks do not yield results, examine the throttle control system for any irregularities that might be affecting cruise control functionality. Additionally, ensure that the ABS system is functioning correctly, as issues here can also disrupt cruise control operations. Don't overlook the brake pedal switch, as a defect in this component can lead to cruise control failure. Lastly, be aware that warning lights, such as the brake light or check engine light, may indicate underlying issues that could impact the cruise control system. By following this structured approach, you can effectively diagnose and potentially fix the cruise control problems in your Lexus LS600h.

What Could Cause the Cruise Control to Malfunction in a Lexus LS600h?

When troubleshooting cruise control malfunctions in a Lexus LS600h, it's vital to recognize the common problems that may be at play. Mechanical issues, such as a damaged cable or vacuum actuator, can disrupt the system's functionality, while electrical problems are more prevalent in newer models where the cruise control is electronically controlled. A faulty cruise control switch can also lead to either complete failure or a partial loss of functionality, making it a key area to inspect. For vehicles equipped with radar-controlled cruise control, any damage or misalignment to the radar or laser unit can significantly affect performance. Additionally, checking for blown fuses dedicated to the cruise control system is essential, as this can prevent proper operation. Lastly, a malfunction in the brake switch circuit, often indicated by the P0571 code, can deactivate the cruise control entirely. By methodically examining these components, you can effectively pinpoint and resolve the underlying issues, restoring your cruise control system to optimal performance.

Why is the Cruise Control Not Working in a Lexus LS600h?

When the cruise control in your Lexus LS600h fails to operate, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and further mechanical complications. A malfunctioning cruise control system can distract the driver, especially during long drives, increasing the likelihood of accidents. Additionally, the underlying causes of the failure, such as a faulty brake switch or issues with the throttle control system, may not only affect cruise control but could also compromise the vehicle's overall performance. Ignoring these symptoms can lead to more significant repairs down the line, including potential damage to the engine control unit (ECU) or other critical components. Therefore, if you experience problems with your cruise control, it is advisable to investigate the issue thoroughly or seek professional assistance to ensure your vehicle remains safe and reliable on the road.

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