1996 Mercedes-Benz SL500 Cruise Control Isn't Working

Fixing Cruise Control Issues in 1996 Mercedes-Benz SL500

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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 1996 Mercedes-Benz SL500 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 1996 Mercedes-Benz SL500 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 1996 Mercedes-Benz SL500?

When troubleshooting the non-functional cruise control in a 1996 Mercedes-Benz SL500, start by checking the speedometer, as its malfunction can directly affect the cruise control system. Next, inspect the fuses associated with the cruise control; blown fuses are a common culprit and can often be replaced easily. Pay attention to the brake pedal and throttle body, as any issues here can disrupt the cruise control's operation. If the check engine light is illuminated, use an OBD2 scan tool to diagnose any underlying problems that may be preventing the cruise control from functioning. Additionally, examine the brake light switch and the brake lights themselves, since any faults in these components can also impact the cruise control system. By systematically addressing these areas, you can effectively narrow down the potential causes of the malfunction and take the necessary steps to restore functionality.

What are the common problems that could cause the cruise control to stop working in a 1996 Mercedes-Benz SL500?

When troubleshooting the cruise control system in a 1996 Mercedes-Benz SL500, it's essential to consider several common issues that could be at play. One of the first things to check is the brake light switch, as a faulty switch can prevent the cruise control from engaging by failing to signal when the brakes are applied. Additionally, inspect for any vacuum leaks in the system, as these can disrupt the cruise control's ability to maintain a consistent speed. Another critical component to examine is the speed sensor; if it's defective, it may provide inaccurate speed readings, leading to cruise control malfunctions. Don't forget to check the fuses related to the cruise control system, as a blown fuse can completely disable its functionality. Lastly, ensure that the throttle cable is in good condition and not stuck or damaged, as this can also hinder the cruise control's operation. By systematically checking these components, DIYers can effectively diagnose and potentially resolve cruise control issues in their SL500.

How urgent is it to repair the non-functioning cruise control in a 1996 Mercedes-Benz SL500?

Repairing the non-functioning cruise control in a 1996 Mercedes-Benz SL500 should be considered a priority, even if it may not seem immediately critical. The absence of this feature can lead to increased driver fatigue, especially during long journeys, as maintaining a constant speed becomes a manual task. This can distract the driver and potentially compromise safety on highways where consistent speed is essential. Additionally, the comfort that cruise control provides cannot be overlooked; it allows for a more relaxed driving experience, reducing strain on the driver's foot and leg during extended trips. Furthermore, from a financial perspective, a malfunctioning cruise control system could negatively impact the vehicle's resale value. Many buyers view functional cruise control as a desirable feature, and its absence may deter potential offers or lead to lower sale prices. Therefore, addressing this issue promptly not only enhances driving safety and comfort but also helps maintain the vehicle's market appeal.

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