1994 Mercedes-Benz E320 Cruise Control Isn't Working

Fixing Cruise Control Issues in 1994 Mercedes-Benz E320

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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 1994 Mercedes-Benz E320 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 1994 Mercedes-Benz E320 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 1994 Mercedes-Benz E320?

When troubleshooting the non-functional cruise control in a 1994 Mercedes-Benz E320, 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 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. Following this, examine 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 performance. It's also important to test the brake pedal switch, since a faulty switch can inadvertently disable the cruise control. Finally, verify the vehicle speed sensor to ensure it is accurately relaying information to the cruise control system. By methodically working through these steps, you can effectively diagnose and potentially resolve the issues affecting your cruise control.

What are the common problems that could cause the cruise control to stop working in a 1994 Mercedes-Benz E320?

When troubleshooting cruise control issues in a 1994 Mercedes-Benz E320, it's essential to consider several common problems that could be at play. A blown fuse or a malfunctioning brake pedal switch are frequent culprits that can disrupt the cruise control system's functionality. Additionally, throttle issues may prevent the system from engaging properly. Electrical problems, such as water intrusion from leaks in the door, sunroof, or trunk, can also interfere with the cruise control operation. Furthermore, worn stabilizer bar bushings may impact the system's performance. If you encounter an error message indicating "cruise control and speedtronic inoperative," this could signal a deeper issue within the cruise control system. A practical first step in your DIY troubleshooting is to check the fuses related to the cruise control in the fuse box. Lastly, be aware that if the ABS light is illuminated due to faulty speed sensor information, it may also affect the cruise control's ability to function correctly, as the ABS system relies on accurate wheel speed inputs. By systematically addressing these potential issues, you can effectively diagnose and resolve cruise control problems in your E320.

How urgent is it to address the non-functioning cruise control in a 1994 Mercedes-Benz E320?

Addressing the non-functioning cruise control in your 1994 Mercedes-Benz E320 should be considered a priority, particularly if you frequently embark on long drives. While it may not seem like an immediate emergency, the convenience and comfort that cruise control provides can significantly enhance your driving experience, especially on highways where maintaining a steady speed is crucial. Ignoring this issue could lead to increased driver fatigue, as manually controlling your speed over extended periods can be tiring and distracting. Moreover, the underlying causes of cruise control failure can range from simple electrical issues to more complex component failures, which, if left unaddressed, could escalate into more significant problems. For instance, common culprits like a blown fuse or a faulty brake switch are relatively easy to fix and can restore functionality quickly. Therefore, while the urgency may vary, it is wise to diagnose and repair the cruise control system promptly to ensure a safer and more enjoyable driving experience.

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