XK-8 Convertible (X100) V8-4.0L (AJ27) (2001)
Cruise Control Module: All Technical Service Bulletins
Adaptive Speed Control - Buzzing/Knocking Noise
2001-04 MY XK Range
Buzzing/Knocking Noise After Start Or With Ignition On - Adaptive Speed Control Module - Repair Procedure
On some 2004 MY XK range vehicles within the above VIN range, customers may have concerns of a buzzing/knocking noise heard when the ignition is
switched 'ON' or just after engine 'start-up'. The adaptive speed control module has a radar scanner inside which scans from side to side 10 times per
second. In some modules the scanner hits the end stops causing a noise.
The buzzing/knocking noise has been confused with a timing chain/tensioner rattle and, if applicable, a supercharger noise.
A revised adaptive speed control module, which contains a contactless potentiometer and a new internal actuator, has been released to address this
In case of a verified customer complaint, install a new modified adaptive speed control module referring to Workshop Manual, section: 310-03.
When instructed to check and adjust the speed control module leveling, carry out speed control module alignment procedure. To assist with the
alignment of the new speed control module on the road refer to the procedure below from FAQ 12441.
Fit module to vehicle, ensuring the vehicle is level, and the radar is fitted level. (Use the electronic Jaguar levelling gauge 501-F007 as supplied
with the initial S-TYPE service tools.)
Connect WDS to vehicle, and run "Configure new module" application. Ensure process is complete and WDS is returned to docking station. Cycle
ignition before driving vehicle. The "follow" icon (Illustration 1) should now be flashing, this indicates the vehicle is in service alignment and now
The service alignment process measures the path of stationary targets such as streetlights, railings, road signs, parked vehicles etc., and uses this
data to correct for radar misalignment. Alignment will complete more quickly if more suitable targets are seen. The following recommendations
The speed must be above 30 mph (48 km/h)
Try to keep the speed relatively constant. Numerous accelerations and decelerations will cause the process to take longer
Choose a road with plenty of road features. Use an inside or outside lane.
Following vehicles too closely will obscure the stationary targets from the radar, a time gap of 2 seconds is recommended.