13+SHO--Engineering Mode Its a fairly simple process,with the vehicle off press the push button start once and while in accessory mode hold the OK button on the left side of the steering wheel for five seconds,while holding the ok button press the push button start again which is ignition mode,at this point you will be in engineering mode and the speedometer will perform a sweep test,then just use the up/down buttons on the left side of the steering wheel to navigate you through the options,also the build date,battery voltage and more can be obtained in this mode. Z
BTW might need to Sticky this. Z
