My cruise control has come up a not available when starting my 2007 XK the same with my radio not coming on under the same circumstance but never at the same time

 

Classic symptoms of low battery voltage, and/or a failing battery. Unless the battery is fully charged you will get random symptoms like these, or others: various warning lights, touch screen freezing, windows, seats and convertible top not operating correctly...the list is long. The cure is a fully charged battery -so, how to keep it fully charged? Get a CTEK battery minder, install it (very simple) and use it whenever the car is not in use on a daily basis. The result will be zero issues. Fir the record: new batteries are almost never fully charged. If you buy a new battery, ensure that it is fully charged before ibstsllation -do not take the word of the clerk at the counter for this.

 

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And in addition to that, an erroneous phone module caused these mishaps if negotiating Bluetooth during startup... since then I only connect Bluetooth after engine is started and all systems are operational.
LOL, someone needs to construct a flight procedures manual for our classic spaceships...

 

You're reading it! This Forum has the answers to almost every question. Workshop Manuals and Owners Handbooks are in the stickies at the top of the first page, and the Advanced Search function is useful to find the answers to your questions.

 

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(It's getting quite hard for anyone to post something never covered before - not impossible, though!)