1992 Mercedes-Benz 300TE Cruise Control Isn't Working

Fixing Cruise Control Issues in 1992 Mercedes-Benz 300TE

Find Repair Location
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 1992 Mercedes-Benz 300TE 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 1992 Mercedes-Benz 300TE 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 1992 Mercedes-Benz 300TE?

When troubleshooting the non-functional cruise control in a 1992 Mercedes-Benz 300TE, it's crucial to adopt a systematic diagnostic approach. Start by checking the fuse box for any blown fuses related to the cruise control system, as this is a simple fix that can often resolve the issue. 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 damage or malfunction, as this component is vital 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. Finally, test the brake pedal switch to confirm it is functioning correctly, as a faulty switch can inadvertently disengage the cruise control. By methodically following these steps, you can effectively diagnose and address the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1992 Mercedes-Benz 300TE?

When troubleshooting the cruise control system in a 1992 Mercedes-Benz 300TE, it's essential to understand the common problems that may lead to its failure. One of the primary issues could be a faulty brake light switch, which is crucial for the cruise control's operation as it disengages the system when the brake pedal is pressed. Additionally, vacuum leaks can significantly disrupt the cruise control's ability to maintain speed, as they affect the pressure needed for proper function. Another potential culprit is a defective cruise control module; if this component fails, it can prevent the system from engaging altogether. Speed sensor issues may also arise, as this sensor is vital for the cruise control to maintain a constant speed. Lastly, electrical problems, such as blown fuses or damaged wiring, can hinder the cruise control system's performance. By systematically checking these areas, DIY enthusiasts can effectively diagnose and resolve the issues affecting their vehicle's cruise control.

How urgent is it to repair the non-functioning cruise control in a 1992 Mercedes-Benz 300TE?

Repairing the non-functioning cruise control in your 1992 Mercedes-Benz 300TE should be treated as an urgent matter. A malfunctioning cruise control system not only diminishes the convenience and comfort of long drives but also poses significant safety risks. When cruise control fails, it can lead to increased driver fatigue, especially on extended journeys, which may impair your ability to react quickly to road conditions. Moreover, the underlying issues causing the malfunction—such as blown fuses or faulty wiring—could escalate into more severe electrical problems if left unaddressed. This neglect can also negatively impact your vehicle's fuel efficiency, as the cruise control system is designed to optimize speed and throttle control for better mileage. Therefore, addressing the cruise control issue promptly is essential for maintaining both your safety and the overall health of your vehicle.

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.

1992 Mercedes-Benz 300TE Cruise Control Issues & Repairs