1998 Mercedes-Benz S320 Cruise Control Isn't Working

Fixing Cruise Control Issues in 1998 Mercedes-Benz S320

Find Repair Location
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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 1998 Mercedes-Benz S320 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 1998 Mercedes-Benz S320 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 1998 Mercedes-Benz S320?

When troubleshooting the non-functional cruise control in a 1998 Mercedes-Benz S320, it's essential to adopt a systematic diagnostic approach. Start by checking the fuse associated with the cruise control system, as a blown fuse can often be the simplest and quickest fix. Next, inspect the cruise control switch located on the steering wheel to ensure it is operational; a malfunctioning switch can prevent the system from engaging. It's also crucial to verify that the brake lights are functioning correctly, as any issues here can disrupt the cruise control's operation. Following this, examine the throttle cable and linkage for any obstructions or damage that might hinder the system's performance. Finally, if the problem persists, consider scanning the vehicle's onboard computer for error codes that could provide further insight into the issue. By methodically working through these steps, you can effectively diagnose and potentially resolve the cruise control malfunction in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 1998 Mercedes-Benz S320?

When dealing with a malfunctioning cruise control system in a 1998 Mercedes-Benz S320, it's essential to understand the common problems that could be at play. One frequent culprit is a defective brake pedal switch, which can interrupt the cruise control signal when the brake is applied. Additionally, a dead battery or blown fuse can disrupt the electrical flow necessary for the cruise control to operate. It's also worth checking the brake lights; if they are not functioning correctly, it may indicate a faulty brake switch that needs replacement. Lastly, issues with the throttle can prevent the cruise control from engaging properly. For those looking to tackle these issues themselves, a systematic approach to diagnosing each of these components can help restore the cruise control functionality without the need for professional assistance.

How urgent is it to repair the non-functioning cruise control in a 1998 Mercedes-Benz S320?

Repairing the non-functioning cruise control in a 1998 Mercedes-Benz S320 should be considered a priority due to the potential safety risks and comfort issues it presents. A malfunctioning cruise control system can lead to increased driver fatigue, as maintaining a consistent speed becomes more challenging, particularly on long journeys. This not only detracts from the driving experience but also raises the likelihood of accidents caused by distraction or loss of focus. Furthermore, the cruise control system is often interconnected with other vehicle systems; thus, ignoring the problem could signal deeper mechanical issues that may compromise overall vehicle performance. By addressing the cruise control malfunction promptly, you not only enhance your driving comfort but also ensure a safer driving environment, making it a wise decision for any DIY enthusiast looking to maintain their vehicle's integrity.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.