Computer disconnected when battery was undone. How long do I need to drive the car before the computer connects again? Trying to take the emmions test and they told me that the computer was disconnected when we undone the battery. Just need to drive it till it resets. How long will that take

It is hard to give a definite answer because I don't know which and how many wires were damaged...Anti theft can be a real HEADACHE.....You can begin by disconnecting battery cables..Use your VIN number for parts,Get new ignition with a programmed factory key from dealer only.....They probably blew certain fuses and or relays when this happened...Or maybe not..Install new ignition connect battery cables..,turn switch on just to check for bad fuses and relays...Disconnect battery again...replace any fuses blown...Connect battery again...( Each time you disconnect battery it resets the computer system and should clear anti theft codes..)..make sure all doors are unlocked by using door remote key fob....Now see if vehicle will crank..If all is done correctly it should start...However I don't know how much damage was done.....It may possibly be too much work to totally disengage anti theft....You could start with removing all fuses and relays related to anti theft but disconnect battery before...I DO NOT RECOMMEND trying to disable the theft system.....You may create more headaches that you want.......Begin by trying what I described just to be safe...!!....

Sometimes able Battery can cause this.It would be a good idea to have system scanned for fault codes..If not,..First check battery voltage for no less than 12.40 to 12.60...disconnect battery to check for proper battery voltage....Disconnecting the battery will reset the vehicle computer system which may solve your problem however it is rare for your issue.....If nothing solves your problem you need an instrument cluster which attaches to the inside and connects behind the gauges...

Disconnect the negative cable from the battery, then go inside your car and press the break pedal for 30 seconds. That should drain the extra power and reset your computer.

Disconnect your battery. Touch the two battery cables together. (make sure they are not in contact while hooked to the battery). Then leave the battery disconnected for 10mins. Connect battery again. This should reset the computer. Sometimes lights my be on until you drive the vehicle a short distance, then it resets.

If I understand it correctly, you are talking about the starter motor replacement. In that case here it is how you can do it. Hope this helps.
1) Remove the feed to the battery & remove the driver side (right hand drive) road wheel.
2) Remove the shroud around the drive shaft (held on with 3 Allen bolts)
3) Remove the two bolts holding the starter motor
4) From under the car (once the underbody tray is removed) you can get your hand in to undo the support bracket and the two nuts holding the electrical connection. this is quite hard as the top nut is hard to get to. but because you have already undone the other retaining bolts you should be able to turn the motor to some degree.
5) Once all undone, a few grazed knuckles later an you should be able to wiggle/push/pull the starter motor out of the bell housing.
6) you should now be able to slide this out through the wheel as the area is just big enough (with the drive shaft shroud removed) to do so.
7) In true Haynes manualstyle - refitting is the reversal of removal - except be patient when trying to do up the electrical connections.

Go to a near autozone/o reilly and ask them to hook up the scanner to your car's computer and clear the code. You can also try disconnecting the battery for about 15mins and connecting it back again (all your settings in you stereo or trip computer could be reset).This will reset the computer and erase the code and the computer is going have to learn everything again. If after trying any of these option and driving the car for a while the code comes back it will required further inspection.

Battery is located in the boot compartment underneath the floor next to the spare tyre. A socket wrench will be needed to undo the 2 10mm bolts on the connection terminals - Nb disconnect the black/negative/earth side first to prevent danger when disconnecting the red/positive/live side. The securing plate is held in place with either a 15mm or 16mm bolt and once you have undone this the battery is easily removed and replaced.

You can disconnect the battery connection and connect them again. If it has a check engine light, it will pop up again untill the problem is fixed. If you are trying to get an inspection, there is way around it but to fix it.

the radio is in theft lock, you will need your unique code that came with the truck new to unlock it.

the sequence is listed on pg.9-19 and 9-20 of the owners manual