Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Detection beam issues

Detection beam issues

Detection issues can occur:

  1. When driving on a different line to the vehicle in front.
  2. When a vehicle edges into your lane.

    The vehicle will only be detected once it has moved fully into your lane.

  3. There may be issues with the detection of vehicles in front, when going into and coming out of a bend.
  4. When moving around a stationary vehicle. This may cause uncertainty as to which vehicle should be followed.
  5. When the vehicle ahead turns out of your lane. This may cause uncertainty as to which vehicle should be followed.

In these situations Adaptive Cruise Control (ACC) may operate unexpectedly. The driver should stay alert and intervene if necessary.

ACC MALFUNCTION

If a fault occurs while ACC, or Follow mode is operational, ACC will switch off and cannot be used until the fault is cleared. The message DRIVER INTERVENE is displayed briefly in the Message centre and is then replaced by the message CRUISE NOT AVAILABLE.

If a fault with ACC, or any related system, occurs at any other time, the message CRUISE NOT AVAILABLE will be displayed. It will not be possible to activate ACC in any mode.

Accumulations of dirt, snow or ice on the radar sensor or cover may inhibit ACC operation. Fitting of a vehicle front protector or metallised badges may also affect ACC operation.

If this occurs in ACC cruise/Follow mode, the audible alarm sounds and the message DRIVER INTERVENE is displayed briefly.

The message RADAR SENSOR BLOCKED will then be displayed.

Note: The same messages may also be displayed while driving on open roads with few objects for the radar to detect.

Clearing the obstruction allows the system to return to normal operation. If the obstruction is present when ACC is inactive (e.g., on initial starting or with ACC switched off), the message RADAR SENSOR BLOCKED will be displayed.

Tyres, other than those recommended for your vehicle, may have different circumferences. This can affect the correct operation of ACC.

FORWARD ALERT FUNCTION

  • The system may not react to slow moving vehicles.
  • Forward alert uses the same radar sensor as Adaptive Cruise Control (ACC). The same performance limitations apply.

Forward alert can be enabled/disabled, via Driver Assistance or Driving features in the Instrument panel menus.

The warning lamp in the Instrument panel illuminates when Forward alert is enabled.

Forward alert provides limited detection and warning of objects close ahead while the vehicle is moving forwards. If a vehicle or object ahead is within the user defined sensitivity area, a warning tone will sound and the FORWARD ALERT message will be displayed in the Message centre.

Emergency Brake Assist (EBA) will be activated.

The driver must take appropriate action immediately.

Sensitivity of the function can be adjusted only when ACC is disengaged. Adjust as follows:

  • Using the steering wheel ACC buttons, press the gap decrease button to display the current setting in the Message centre and then press again to decrease the sensitivity of the alert.
  • Press the gap increase button to display the current setting in the Message centre and then press again to increase the sensitivity of the alert.

FWD ALERT <----> is displayed in the Message centre.

Note: The Forward alert set gap is retained when the ignition is switched off.

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