| Pos. | Spare part number | Name |
| 1 | - | Steering wheel module |
| 2 | - | Coil spring and steering angle sensor |
The steering wheel module contains the steering wheel angle sensor, the coil spring and the multi-function switches located on the steering column, forming a single unit. The steering wheel angle sensor is connected directly to the coil spring.
The steering wheel module is secured to the top of the steering column with two screws and receives electrical power from the main wiring harness via a 4-pin electrical connector located on the side of the unit. The module serves as the location and electrical connection for two multi-function switches.
Input signals from the steering angle sensor are received and processed by the steering wheel module to calculate the steering wheel angle and the rate of change of the steering wheel angle. The information is transmitted over the high-speed CAN bus for use by the ABS module.
Steering wheel angle sensor
The steering angle sensor is connected to the steering wheel by two mounting pins. The steering angle sensor monitors the rotation of the steering wheel and provides information about the steering wheel angle and the speed of rotation of the steering wheel.
The steering wheel angle sensor has a pulse wheel and 16 optical digital sensors installed inside. The rotation of the pulse wheel is read by the optical digital sensors to generate steering wheel rotation signals. The steering wheel angle sensor is capable of measuring a rotation range of +/- 720 degrees, although the steering gear only allows the steering wheel to rotate a maximum of +/- 540 degrees.
The signals from the steering wheel angle sensor are transmitted via the high-speed CAN bus and are received and processed by other systems such as DSC. The transmitted information contains detailed information on the steering angle and speed of rotation of the steering wheel, together with information on the integrity of the signal.
If a malfunction occurs in the steering angle sensor, a DTC will be generated and stored in the steering angle sensor memory. The steering angle sensor malfunction information is also stored in the ABS module memory, which causes the relevant warning lights to illuminate, depending on the functions in question (DSC/ETC, ABS, EBA/EBD, HDC). A warning chime also sounds to alert the driver of the malfunction.
On vehicles equipped with a "high series" instrument cluster, the message in the message center is only displayed if a fault affects the operation of the HDC.
For more information, please refer to the chapter:
- Instrument cluster (413-01 Instrument cluster, Description and operating principle)
- Information and Message Center (413-08 Information and Message Center, Description and Operating Principle)
It is possible to read information from the steering angle sensor and ABS module using Land Rover approved diagnostic equipment.
Spiral spring
The coil spring is a rotating coupling that provides an electrical connection between the fixed steering wheel module and the steering wheel mounted controls and the driver's air bag, which is part of the Supplemental Restraint System (SRS).
The coil spring has a color indicator that is visible through the clear plexiglass cover when the steering wheel is removed and the steering angle sensor is centered. The indicator certifies that the steering angle sensor and steering system are correctly aligned after the steering gear is repaired.
Service information
Before separating the steering components from the steering column, the coil spring should be centered (indicator visible) and the wheels pointed straight ahead. The coil spring is held in the center position by a locking screw.
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