1990 Mercedes-Benz 190E Cruise Control Isn't Working

Fixing Cruise Control Issues in 1990 Mercedes-Benz 190E

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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 1990 Mercedes-Benz 190E 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 1990 Mercedes-Benz 190E 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 1990 Mercedes-Benz 190E?

When troubleshooting the non-functional cruise control in a 1990 Mercedes-Benz 190E, start with the simplest checks before moving on to more complex diagnostics. Begin by inspecting the fuse box to confirm that the fuse associated with the cruise control system is intact, as a blown fuse can often be the culprit. Next, examine the cruise control switch located on the steering wheel to ensure it is operational; a faulty switch can prevent the system from engaging. Following this, assess the cruise control module for any signs of damage or malfunction, as this component is crucial for the system's functionality. Additionally, inspect the vacuum lines connected to the cruise control system for leaks or damage, as these can significantly impact performance. It’s also important to test the cruise control actuator to verify that it is receiving the necessary signals to activate the system. Finally, consider scanning the vehicle's onboard computer for any error codes that may provide further insight into the issue. By systematically following these steps, you can effectively diagnose and address the problems affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1990 Mercedes-Benz 190E?

When troubleshooting the cruise control system in a 1990 Mercedes-Benz 190E, it's important to consider several common problems that could be at play. A faulty cruise control switch is often the first suspect, as it can prevent the system from engaging properly. Additionally, the cruise control module itself may be defective, leading to operational issues. Vacuum leaks are another frequent culprit, as they can disrupt the system's functionality by affecting the pressure needed for proper operation. Furthermore, a malfunctioning speed sensor can result in inaccurate speed readings, which directly impacts the cruise control's ability to maintain speed. Electrical issues, including problems with wiring or blown fuses, can also hinder the system's performance. Lastly, a defective brake light switch can inadvertently disable the cruise control, as the system is designed to disengage when the brakes are applied. By systematically checking these components, DIYers can effectively diagnose and resolve the cruise control issues in their vehicle.

How urgent is it to repair the non-functioning cruise control in a 1990 Mercedes-Benz 190E?

When evaluating the urgency of repairing the non-functioning cruise control in a 1990 Mercedes-Benz 190E, it's essential to weigh the implications of neglecting this feature. While cruise control primarily enhances driving comfort and reduces fatigue on long trips, its absence can lead to increased driver distraction, particularly during extended journeys. This distraction can inadvertently compromise safety, making it a factor worth considering for timely repair. Additionally, if you are contemplating selling or trading in your vehicle, a fully operational cruise control system can significantly enhance its resale value, making the repair more pressing. To make an informed decision, it is advisable to conduct a diagnostic check with a professional who can assess the issue's severity and provide guidance on whether the malfunction poses any risks or could lead to further complications. Ultimately, while the repair may not be immediately critical, addressing it sooner rather than later can improve your driving experience and maintain the vehicle's value.

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1990 Mercedes-Benz 190E Cruise Control Issues & Repairs