Beatrice Lang
The Toyota Highlander Hybrid has been equipped with electric power steering since at least 2006. This differs from the regular Highlander, which uses hydraulic power steering. While electric power steering systems assist the driver with turning power and increasing subtlety at high speeds, they can be more dangerous than traditional hydraulic systems if they fail. This is because they often use drive-by-wire technology, which means that the steering wheel is not mechanically connected to the steering gear.
| Characteristics | Values |
|---|---|
| Steering | Electric power steering |
| Power steering fluid | Not required |
| Steering control module replacement cost | $933–$971 |
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What You'll Learn
- The 2006 and 2007 Toyota Highlander Hybrid models have electronic power steering
- The power steering control module is responsible for assisting the driver with turning power and increasing subtlety at high speeds
- The power steering motor or steering angle sensor may be faulty if the steering wheel feels resistant
- The 2006 Highlander Hybrid had an issue with its electric power steering link (EPS) assembly
- The regular HL uses hydraulics for power steering, while the HH uses electric power steering
The 2006 and 2007 Toyota Highlander Hybrid models have electronic power steering
The 2006 and 2007 Toyota Highlander Hybrid models are equipped with electronic power steering. This technology differs from traditional hydraulic power steering systems, which physically connect the steering wheel to the steering gear. In contrast, electronic power steering systems employ "drive-by-wire" technology, where the steering wheel is not mechanically linked to the steering gear.
The electronic power steering in the 2006 and 2007 Highlander Hybrid models offers several advantages. Firstly, it assists the driver with turning power and enhances steering subtlety at high speeds. The system includes a motor mounted on the steering column or steering gear, along with a control module to manage its operation. This control module is responsible for sensing the position, direction, and speed of the steering wheel, ensuring precise control.
While electronic power steering provides benefits, it is important to promptly address any issues that may arise. Unlike hydraulic systems, the electronic nature of these power steering systems can make diagnosing and repairing them more complex. Some common problems associated with electronic power steering include a faulty power steering motor or steering angle sensor. In some cases, a compatible scan tool may be required to accurately diagnose and calibrate certain issues.
Toyota issued a Special Service Campaign (#90A) related to the electric power steering in certain 2006-2007 Highlander HV models. The issue pertained to an insufficient adhesion between the permanent magnets and the rotor of the Electric Power Steering Link Assembly, resulting in a gradual increase in steering effort at low speeds when turning the wheel to the complete left or right position.
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The power steering control module is responsible for assisting the driver with turning power and increasing subtlety at high speeds
The power steering control module is an essential component of modern vehicles, including the Toyota Highlander Hybrid. This module is responsible for assisting the driver in turning the vehicle and enhancing overall driving stability.
The power steering control module achieves this assistance by increasing or decreasing power steering assistance based on signals received from various sensors, such as the torque sensor and the steering angle sensor. The torque sensor measures the driver's steering effort and converts it into an electrical signal, indicating the force required to turn the wheels. On the other hand, the steering angle sensor communicates the steering wheel's position and the speed at which the driver turns the wheel.
By utilising these sensor inputs, the power steering control module can adjust the direction and amount of steering assistance provided to the driver. This is particularly beneficial during slow speeds and parking manoeuvres, where more steering assistance is typically needed. Conversely, at high speeds, the control module reduces the assistance, allowing the driver to make subtle adjustments to the vehicle's direction.
In the event of a problem with the power steering system, the control module takes proactive measures to ensure the driver's safety. It illuminates the EPS warning light on the instrument panel and deactivates the system. Additionally, the module communicates with other advanced driver assistance systems, such as lane-keeping assist and automatic parking assist, by sharing data through the Controller Area Network (CAN). This interconnectedness helps maintain the overall stability and safety of the vehicle.
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The power steering motor or steering angle sensor may be faulty if the steering wheel feels resistant
The Toyota Highlander is available as a hybrid model. While I cannot confirm if it has electric steering, I can provide information on what to do if you are experiencing issues with the steering wheel.
If the steering wheel feels resistant, it could be due to a problem with the power steering motor or the steering angle sensor. Firstly, check your power steering fluid levels, as low fluid can cause the power steering to fail and make the wheel harder to turn. If the fluid levels are normal, then the issue could be with the power steering motor. In this case, it is recommended to have the steering and suspension inspected by a qualified technician.
The steering angle sensor is a vital component that senses the steering angle and sends this information to the vehicle's onboard computer. If this sensor is faulty, misaligned, or damaged, it can cause the vehicle to make adjustments at the wrong time, leading to a "loose" condition in the steering wheel. Common signs of a failing steering angle sensor include the traction control light coming on, a loose steering wheel, and the car driving differently after a front-end alignment.
To diagnose a faulty steering angle sensor, you can use a diagnostic tool to check the live data from the traction control system or engine control unit. With the steering wheel straight, the signal should read 0 degrees. If you turn the wheel slightly to the left and right and the values do not change, it indicates a faulty sensor.
It is important to address issues with the steering wheel promptly to ensure safe driving conditions. If you are unable to steer the vehicle accurately, call for a tow truck and have the vehicle inspected by a qualified technician or mechanic.
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The 2006 Highlander Hybrid had an issue with its electric power steering link (EPS) assembly
The 2006 Toyota Highlander Hybrid experienced issues with its electric power steering system. Specifically, there were problems with the electric power steering link (EPS) assembly. This issue affected both the 2006 and 2007 models of the Highlander Hybrid, as well as some Lexus and Camry Hybrids. Toyota initiated a recall campaign, known as Service Campaign 90A, to address the problem.
The issue with the EPS assembly was caused by insufficient adhesion between the permanent magnets and the rotor of the EPS. This, in turn, led to a loss of torque in the motor when the wheel was turned to the extreme left or right position. As a result, drivers experienced a sudden increase in the steering effort necessary at low speeds, particularly when parking the vehicle. In some cases, the steering wheel would pull sharply in one direction and then quickly in the opposite direction, making it difficult to control the car.
Toyota dealerships were unable to immediately identify the cause of the issue or provide a solution. The company did not issue a technical service bulletin, leaving customers confused and concerned. Some customers reported that their dealerships replaced the steering assist motors or the entire power steering rack, but the problem persisted. The repair work was covered under warranty and typically took around five hours to complete.
The issue with the electric power steering link assembly in the 2006 Highlander Hybrid highlights the challenges of early hybrid vehicle technology. While Toyota worked to address the problem, the situation caused inconvenience and safety concerns for affected customers. It also brought attention to the complexities of diagnosing and repairing hybrid vehicles, underscoring the need for specialised tools and trained technicians.
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The regular HL uses hydraulics for power steering, while the HH uses electric power steering
The Toyota Highlander has two variants: the regular HL and the hybrid variant, or HH. While both variants offer power steering, they differ in the technology used to achieve this. The regular HL uses a hydraulic system, while the HH uses an electric power steering system.
The hydraulic system in the regular HL uses fluids and pumps to assist the driver with turning the wheels. This system provides a firm and positive steering feel. On the other hand, the HH's electric power steering system uses an electric motor and control module to assist with steering. This system is designed to sense the position, direction, and speed at which the steering wheel is turned, providing subtle steering assistance at high speeds.
One advantage of the electric power steering in the HH is that it does not require power steering fluid, as mentioned by a 2007 Toyota Highlander Hybrid owner. However, this system is not without its challenges. Some owners of the 2007 Toyota Highlander Hybrid have experienced issues with their electric power steering, requiring them to replace the power steering computer or control module.
The power steering control module in the HH is crucial for the proper functioning of the electric power steering system. When issues arise, technicians diagnose the problem by comparing actual conditions to electronic conditions. If a discrepancy is found, it indicates an issue with the control module, which then needs to be replaced. The average cost for replacing the power steering control module in a Toyota Highlander is between $933 and $971, but prices can vary.
In summary, while the regular HL relies on hydraulics for power steering, the HH employs an electric power steering system. Both systems offer advantages and require different maintenance approaches. It is important to promptly address any issues with the power steering system, especially in vehicles with electronic power steering, to ensure safe driving.
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Frequently asked questions
Yes, the Toyota Highlander Hybrid has electronic power steering.
If you experience a noticeable increase in steering effort at low speeds when turning the wheel to the complete left or right position, your power steering may have a problem. This issue is caused by an insufficient adhesion between the permanent magnets and the rotor of the Electric Power Steering Link Assembly.
You should take your vehicle to a certified technician to diagnose and repair the issue. They will use a compatible scan tool to check for fault codes and discrepancies between actual and electronic conditions.
The average cost for a Toyota Highlander Power Steering Control Module Replacement is between $933 and $971 but can vary from car to car.
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