Adaptive Speed Control Module - If Equipped

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The Adaptive Speed Control Module (ASCM) is mounted on a bracket which is attached to the front grille behind the Jaguar badge.

The ASCM contains a forward looking radar transceiver together with related controlling hardware and software. The High Speed (HS) Controller Area Network (CAN) chassis bus connection allows the ASCM to communicate with other system control modules. Power supplies to the ASCM are from the extended ignition relay in the right Engine Junction Box (EJB).

The ASCM is active whenever the ignition is on, even if speed control is not engaged. This is necessary in order to operate the forward alert, Advanced Emergency Brake Assist (AEBA) and Intelligent Emergency Braking (IEB) functions.

The ASCM transmits a radar beam forward of the vehicle and detects the returning signals reflected off other vehicles and objects ahead. The radar beam monitors signals across a total horizontal arc of 30° with a vertical coverage of ±9° from the nominal position. The radar operates at millimetric wavelengths (76 - 77 GHz) and transmits a frequency modulated continuous wave signal at a relatively low power level (no high power pulses). The ASCM detects the range, relative velocity and angle of objects within the scanned arc for up to a distance of approximately 150 meters (500 feet).

The ASCM compares vehicle speed data from the Anti-lock Brake System (ABS) control module with the relative speed of an external object. The speed of the objects is detected by the radar to determine that the object is stationary or not. The speed of the vehicle is calculated by the ABS control module.

NOTE: If tires are different in diameter from those specified for the vehicle, the speed of the vehicle will not be the true road speed. This situation may cause stationary objects to be falsely identified as moving vehicles and result in automatic deceleration on a clear road.

The ASCM continuously monitors both moving vehicles and stationary objects to determine if ASCM can 'see' normally.

The ASCM is physically blocked, if one of the following occurs:

There are a few roadside objects in the area.
Other vehicles are in the area.
Accumulation of snow or mud on the Jaguar badge in the upper grille of the front bumper.
Incorrectly mounted license plate.

The ASCM then inhibits adaptive speed control and records a Diagnostic Trouble Code (DTC). The system will reset after an ignition cycle. In this case the ASCM does not have a fault and should not be replaced.

Mechanical leveling is not required. Horizontal and vertical alignment is achieved by putting the ASCM into 'Service Alignment Mode' using the Jaguar Land Rover approved diagnostic equipment. The vehicle then needs to be driven for a short period while the ASCM performs a calibration routine.

The service alignment process measures the path of stationary targets for example streetlights, railings, road signs, and parked vehicles. The service alignment process uses this data to correct for radar misalignment.

Check the vertical level of the ASCM after installation by removing the badge and using the digital inclinometer. The ASCM should point down by 2° with a tolerance of ±2°, if the measured value exceeds this limit then recheck the installation.

During alignment the following recommendations help:

From the diagnostic tool menu, select the 'Service Alignment Mode'.
The flashing of the follow mode warning indicator indicates that the vehicle is in 'Service Alignment Mode' and requires driving. (The park brake warning indicator may hide the follow mode warning indicator until the parking brake is released.)
The vehicle speed must be above 40 km/h (25 mph).
Choose a road with plenty of stationary objects, like street lights, parked cars, road signs, or barriers. Use an inside or outside lane.
Following vehicles too closely will obscure the stationary objects from the radar, a time gap of 2 seconds is recommended.
A straight road will produce a quicker and better result, although the process will still operate on a curved road.
When the flashing follow mode warning indicator extinguishes, the initial alignment is complete. The adaptive speed control system will continue to refine the alignment.

After the alignment process ends, check that the adaptive speed control system can be engaged.

If the adaptive speed control system can be engaged, no further driving is required.
If the adaptive speed control system can not be engaged, use the diagnostic tool to restart the 'Service Alignment Mode'.
If the adaptive speed control system can not be engaged after the second attempt, remove the front bumper and check the ASCM installation. Repeat the alignment process after the installation has been corrected.

In the first 2 hours of driving, adaptive speed control system will continue to self-calibrate. During the calibration time the adaptive speed control system may not be available and full system performance may not be achieved.