1993 Mercedes-Benz 600SL Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 1993 Mercedes-Benz 600SL

Find Repair Location
Reviewed by
Andrew Hajjar
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 600SL 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 600SL 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 steps to diagnose the non-functional cruise control in a 1993 Mercedes-Benz 600SL?

To diagnose the non-functional cruise control in your 1993 Mercedes-Benz 600SL, begin with a methodical approach that emphasizes simplicity and efficiency. Start by checking the fuse associated with the cruise control system, as a blown fuse can often be the root of the problem. Next, inspect the cruise control switch for any visible damage or malfunction, as this component is crucial for activating the system. Following this, examine the vacuum lines for leaks or damage, since these can significantly impact the cruise control's performance. It's also essential to test the brake pedal switch, which is designed to disengage the cruise control when the brakes are applied; a faulty switch can prevent the system from functioning correctly. Additionally, check the speed sensor to ensure it is relaying accurate information to the cruise control system. If these preliminary checks do not yield results, consider using a diagnostic scanner to identify any error codes that may point to underlying issues. Should these steps fail to resolve the problem, consulting a professional mechanic with expertise in Mercedes-Benz vehicles may be necessary for a thorough diagnosis and repair. By following this structured diagnostic approach, you can effectively troubleshoot and potentially restore the functionality of your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1993 Mercedes-Benz 600SL?

When troubleshooting the cruise control system in a 1993 Mercedes-Benz 600SL, it's essential to consider several common problems that could be affecting its functionality. One of the primary culprits is a faulty brake light switch, which is crucial for disengaging the cruise control when the brake pedal is pressed. If this switch malfunctions, it can prevent the cruise control from engaging at all. Additionally, vacuum leaks within the system can disrupt the necessary pressure required for the cruise control to maintain speed, leading to erratic performance. Another potential issue is a defective cruise control module, which serves as the brain of the system; if it fails, the entire cruise control may become inoperative. Speed sensor problems can also hinder the system's ability to maintain a consistent speed, while electrical issues, such as blown fuses or damaged wiring, can further complicate matters. By systematically checking these components, DIY enthusiasts can effectively diagnose and resolve the issues plaguing the cruise control system in their 1993 Mercedes-Benz 600SL.

How urgent is it to address the non-functioning cruise control in a 1993 Mercedes-Benz 600SL?

Addressing the non-functioning cruise control in a 1993 Mercedes-Benz 600SL is more urgent than it may initially seem. While it might not appear to be an immediate emergency, neglecting this issue can lead to significant safety risks. A malfunctioning cruise control system can cause erratic speed changes, which may result in loss of vehicle control, especially on highways where maintaining a steady speed is crucial. Furthermore, the comfort of your driving experience is compromised; long trips can become tedious without the convenience of cruise control, leading to increased driver fatigue. Additionally, from a financial perspective, a well-maintained vehicle retains its value better in the resale market. Prospective buyers are often deterred by non-functioning features, which can diminish the overall appeal of your car. Therefore, it is advisable to address the cruise control issue promptly to ensure a safer, more comfortable driving experience while also protecting your investment.

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.