1993 Mercedes-Benz 500SL Cruise Control Isn't Working

Fixing cruise control issues in the 1993 Mercedes-Benz 500SL

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 1993 Mercedes-Benz 500SL 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 1993 Mercedes-Benz 500SL 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 1993 Mercedes-Benz 500SL?

When troubleshooting the non-functional cruise control in a 1993 Mercedes-Benz 500SL, start with the simplest checks to avoid unnecessary complexity. Begin by inspecting the fuse associated with the cruise control system; a blown fuse can often be the culprit behind electrical failures. Next, examine the cruise control switch located on the steering wheel to ensure it is operational, as a malfunctioning switch can prevent the system from engaging. Following this, assess the cruise control module for any signs of failure, as this component is crucial for the system's functionality. Additionally, inspect the vacuum lines for any leaks or damage, as these can significantly impact the system's performance. It’s also important to test the brake pedal switch, since a faulty switch can inadvertently disable the cruise control. Finally, verify that the vehicle speed sensor is functioning correctly, as it provides essential data for the cruise control system to operate effectively. By systematically addressing these areas, you can effectively 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 1993 Mercedes-Benz 500SL?

When troubleshooting cruise control issues in a 1993 Mercedes-Benz 500SL, it's essential to consider several common problems that may be affecting the system's functionality. One of the primary culprits could be a faulty cruise control switch, which may prevent the system from engaging properly. Additionally, a defective brake light switch can disrupt the cruise control operation, as this switch is designed to disengage the system when the brakes are applied. Another potential issue is vacuum leaks within the cruise control system, which can lead to a loss of pressure and result in the system failing to maintain speed. Furthermore, a malfunctioning speed sensor may hinder the cruise control's ability to accurately monitor and maintain the set speed. It's also important to check for a blown fuse, as this can completely disable the cruise control system. Lastly, inspect the throttle cable for any signs of fraying or stretching, as these issues can impact the system's performance. By understanding these common problems, DIY enthusiasts can effectively diagnose and address cruise control issues in their Mercedes-Benz 500SL.

How urgent is it to repair the non-functioning cruise control on a 1993 Mercedes-Benz 500SL?

When evaluating the urgency of repairing the non-functioning cruise control on a 1993 Mercedes-Benz 500SL, it is crucial to recognize the potential safety risks and driving comfort issues that may arise from neglecting this repair. A malfunctioning cruise control system can lead to erratic vehicle behavior, such as unexpected acceleration or deceleration, which poses a significant safety hazard on the road. Additionally, the absence of cruise control can detract from the overall driving experience, particularly during long trips where maintaining a constant speed is essential for comfort and reducing driver fatigue. Furthermore, issues with the cruise control may signal underlying problems with other vehicle components, making it imperative to address these concerns promptly to prevent further damage and ensure optimal vehicle performance. Therefore, while it may not be classified as an emergency, timely repair of the cruise control system is advisable to safeguard both the driver and the vehicle's integrity.

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Fix 1993 Mercedes-Benz 500SL Cruise Control Issues