My experience with faulty CC. The CC would sometimes turn off by itself, wouldn't turn on. Bought the brake light switch, didn't fix the problem. Both switches (brake and clutch) had contact with pedals. Checked fuses all good. Tested both switches with multimeter they worked perfectly. Then tested the connector for CC. The negative wire had no earth. New earth no nearby connector and woila, CC works again perfectly.
The connector has 5 wires. (earth, 12V constant, empty, switch ON/OFF and reset, switch -, switch +)
Hope this helps.