Incorrectly fitted bulb making the system think the brake lights are on?
Or a power surge issue, voltage dropping as you switch thelights on?
Does it happen if you switch just the sidelights 1st then pause then switch the main lights on?
Try with the lights off and use the headlamp flasher, what happens?
I HAVE CHECKED THE BULBS EVEN AND ALL LIGHTS ARE FINE BUT PROBLEM OCCUR AS SOON AS I SWITCH SIDE LIGHT OR HEAD LIGHTS ON. CRUISE CONTROL JUST STOP WORKING WHEN EVER I TOUCH LIGHT BUTTON ONLY. OTHERS ALL FINE. REGARDS.
Check the earths for your rear lights. Its possible that when the current from the sidelights is attempting to pass through the bad earth it is making the cruise module think the brake lights are on
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