1995 Lexus LS400 Cruise Control Isn't Working

Fixing cruise control issues in the 1995 Lexus LS400

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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 1995 Lexus LS400 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 1995 Lexus LS400 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 throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.

Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.

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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 1995 Lexus LS400?

When troubleshooting the non-functional cruise control in a 1995 Lexus LS400, it's crucial to follow a methodical diagnostic approach that starts with the simplest solutions. Begin by checking the fuse related to the cruise control system, as a blown fuse is often the most straightforward issue to resolve. Next, inspect the wiring for any signs of damage or loose connections, which can interrupt the electrical flow necessary for the system's operation. Testing the cruise control switch with a multimeter is also important to ensure it is functioning properly. Additionally, examine the vacuum lines for any leaks or damage, as these components are essential for the cruise control to work effectively. If these initial checks do not uncover the problem, using a diagnostic scanner to retrieve any error codes can provide valuable insights into the issue. Lastly, verify the functionality of the cruise control module by checking its connections and ensuring it is receiving power. By systematically addressing these areas, you can efficiently diagnose and potentially resolve the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1995 Lexus LS400?

When dealing with a malfunctioning cruise control system in a 1995 Lexus LS400, it's crucial to understand the common problems that could be at play. One of the first areas to check is the cruise control switch, as a faulty switch can prevent the system from engaging. Additionally, a blown fuse can disrupt the electrical flow necessary for the cruise control to function, so inspecting the fuses is a vital step. Another potential issue is vacuum leaks within the cruise control system, which can significantly affect its performance. The speed sensor also plays a critical role; if it's defective, it may cause the cruise control to disengage unexpectedly. Furthermore, the brake light switch should be examined, as any issues here can inhibit the cruise control from activating. Lastly, a malfunctioning throttle cable can hinder the system's ability to maintain speed effectively. By systematically checking these components, DIYers can accurately diagnose and resolve the cruise control issues in their Lexus LS400.

How urgent is it to address the non-functioning cruise control in a 1995 Lexus LS400?

When it comes to the non-functioning cruise control in a 1995 Lexus LS400, understanding the urgency of the situation is crucial for any DIY enthusiast. While this issue may not present an immediate safety hazard like malfunctioning brakes or engine problems, it can significantly affect your driving experience, especially during long trips. A malfunctioning cruise control system can lead to driver fatigue, as maintaining a constant speed becomes a manual task, detracting from the comfort and ease that this feature is designed to provide. Moreover, delaying repairs could result in further complications within the system, potentially escalating repair costs down the line. Therefore, while it may not seem critical at first glance, addressing the cruise control issue promptly is essential for ensuring a comfortable and safe driving experience. Taking the time to diagnose and repair this feature not only enhances your vehicle's functionality but also contributes to your overall driving enjoyment.

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