1997 Mercedes-Benz SL500 Cruise Control Isn't Working

Fixing Cruise Control Issues in 1997 Mercedes-Benz SL500

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Reviewed by
Aisha
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 1997 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 1997 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 1997 Mercedes-Benz SL500?

When troubleshooting the non-functional cruise control in your 1997 Mercedes-Benz SL500, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuses, as a blown fuse can often be the simplest explanation for cruise control failure. If the fuses are intact, take your vehicle for a test drive, ensuring you reach speeds above 30 mph, as cruise control typically activates at this threshold. While driving, pay attention to any unusual behavior or warning lights, particularly the check engine light, which may indicate underlying issues affecting the cruise control system. Additionally, inspect the spiral cable located in the steering wheel; a damaged or faulty cable can disrupt the cruise control functionality. By following these initial steps, you can effectively narrow down the potential causes of the problem and determine whether further investigation or professional assistance is needed.

What are the common problems that could cause the cruise control to stop working in a 1997 Mercedes-Benz SL500?

When troubleshooting the cruise control system in a 1997 Mercedes-Benz SL500, it's essential to understand the common problems that may lead to its failure. One of the primary issues is a faulty brake light switch, which can prevent the system from engaging if it fails to detect when the brake pedal is pressed. Additionally, vacuum leaks can disrupt the system's ability to maintain speed, leading to inconsistent performance. Another potential culprit is a defective speed sensor, which can provide inaccurate readings and cause the cruise control to malfunction. It's also important to check for a blown fuse, as this can completely disable the cruise control system. Lastly, issues with the throttle cable, such as damage or sticking, can interfere with the operation of the cruise control. By identifying these common problems, DIY enthusiasts can better diagnose and address the issues affecting their vehicle's cruise control functionality.

How urgent is it to repair the non-functioning cruise control in a 1997 Mercedes-Benz SL500?

Repairing the non-functioning cruise control in a 1997 Mercedes-Benz SL500 should be viewed as a priority, even if it may not seem immediately critical. The absence of this feature can lead to increased driver fatigue, particularly on long journeys, as maintaining a consistent speed becomes more challenging. This fatigue can distract the driver, potentially heightening the risk of accidents. Furthermore, the comfort level during extended drives is significantly diminished without cruise control, making the driving experience less enjoyable. Additionally, from a financial perspective, neglecting this repair could adversely affect the vehicle's resale value. A well-maintained car is more appealing to potential buyers, and addressing issues like cruise control malfunction can help preserve that value. Therefore, while the urgency may not be life-threatening, the implications for safety, comfort, and financial investment make it advisable to repair the cruise control system promptly.

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1997 Mercedes-Benz SL500 Cruise Control Issues & Repairs