1. Cruise Control Switch:
- Check the cruise control switch on the steering wheel. Ensure it's properly engaged and not damaged. Try pressing and releasing the switch a few times to see if it makes any difference.
2. Vacuum System:
- The cruise control system in the XJ6 utilizes a vacuum system. Check if there are any leaks in the vacuum lines. If there's a leak, it can prevent the cruise control from functioning properly. Ensure the vacuum lines are securely connected and not cracked.
3. Cruise Control Module:
- There may be an issue with the cruise control module itself. It's located behind the dashboard. Check if the module is securely connected and that there's power going to it. If there's a fault within the module, it may need to be repaired or replaced.
4. Throttle Cable or Linkage:
- Check the throttle cable or linkage connected to the cruise control system. Ensure the cable is properly connected, free from obstructions, and not broken.
5. Brake and Clutch Switches:
- The cruise control system also relies on the brake and clutch switches. Check these switches to make sure they're functioning properly. Depress the brake pedal and release it to see if the brake lights illuminate. Do the same with the clutch pedal. If the switches are faulty, they may need to be replaced.
6. Check Fuses:
- There may be a blown fuse that's affecting the cruise control system. Locate the fuse box and check the fuse labeled for cruise control (it may be labeled as "CRUISE" or something similar). Replace any blown fuses.
Remember that if you're unsure about any of the above checks or repairs, it's best to consult a professional mechanic who has experience working with classic Jaguar models.
