1998 BMW 750iL Cruise Control Isn't Working

Fixing Cruise Control Issues in the 1998 BMW 750iL

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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 1998 BMW 750iL 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 1998 BMW 750iL 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

What are the initial steps to diagnose the non-functioning cruise control in a 1998 BMW 750iL?

To effectively diagnose the non-functioning cruise control in your 1998 BMW 750iL, begin by systematically assessing the system. Start with a visual inspection of the cruise control components, checking for any obvious signs of wear or damage. Next, utilize a BMW scanner to read the fault codes associated with the cruise control system; this tool is crucial for pinpointing specific malfunctions. If the scanner reveals error codes, research these codes to understand their implications and potential fixes. Should you encounter complex issues or if the problem persists after basic troubleshooting, consider consulting a professional mechanic who specializes in BMWs. This step ensures that any intricate problems are addressed with the appropriate expertise, allowing you to restore your cruise control functionality efficiently. By following this structured approach, you can confidently diagnose and potentially resolve the cruise control issues in your BMW 750iL.

What are the common problems that could cause the cruise control to stop working in a 1998 BMW 750iL?

When troubleshooting the cruise control system in a 1998 BMW 750iL, it's essential to consider several common issues that may be at play. One frequent culprit is the malfunctioning turn signal or high beam switch, which can inadvertently disrupt the cruise control functionality. Additionally, problems with the cruise control switch itself, or the brake pedal and clutch lever, can prevent the system from engaging properly. It's also important to check the cruise control cancel circuit, as any faults here can lead to unexpected disengagement. Furthermore, if the steering wheel heating is activated simultaneously with the cruise control, it may cause interference, leading to operational issues. Lastly, misadjustment of the adaptive cruise control sensor can also hinder performance. By systematically examining these components, DIYers can effectively diagnose and resolve the cruise control malfunction, restoring functionality to their vehicle.

How urgent is it to repair the non-functioning cruise control in a 1998 BMW 750iL?

Addressing the non-functioning cruise control in your 1998 BMW 750iL is not just a matter of convenience; it is a critical safety concern that warrants immediate attention. An illuminated Check Engine Light (CEL) often accompanies this malfunction, signaling that there may be underlying issues that could escalate if left unresolved. The cruise control system is designed to enhance driving comfort, particularly during long journeys, by maintaining a steady speed and reducing driver fatigue. Without it, you may find yourself more fatigued and less focused, which can increase the risk of accidents. Furthermore, neglecting this repair can lead to decreased fuel efficiency and potential engine performance issues, such as hesitation, which could result in costly repairs down the line. Therefore, it is essential to prioritize fixing your cruise control system to ensure not only your safety but also the overall performance and longevity of your vehicle. Taking action now can save you from more significant problems in the future, making it a wise choice for any DIY enthusiast.

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