I need the wiring diagram for a gateway sx2855-22ub i unhooked it to replace the motherboard and need to hook it back up

Anti-theft has nothing to do with it ,disconnecting the battery won't do anything either . You left something disconnected or by not disconnecting the battery you blew a main fuse somewhere some how. You had to take a few things apart to get at the water pump. You need to find battery power distribution wiring diagrams an check with a voltmeter. See it all the time ,rookies

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You'll probably have to do some internet research to get the wiring diagram, or buy a book to be able to trace the wires to and from the horn relay.

We have no wiring diagrams of any kind. Sorry

First you unhook the battery neg side first then pos side then you remove the wires from the starter solinoid make a mental note so you know how to hook it back up then take out the two starter bolts holding it remove old starter put new one in put the two starter bolts in then put wires back on the solinoid hook the battery back up and your done.

ur blake light switch needs replaced I had same problem.

You may try to unhook the battery negative cable and touching it to the positive cable and then hook it back up. Plugs and plug wires needing to be changed will not set a code turning light on anyway. If it stays on you will need to get the code it has stored in it and get that repaired then use a scan tool to turn it off.

unhook all wires and clarify you have the proper diagram and wory bout the wires is says to wire togethe , often you will have extra wires.

Unhook the TPS connect a volt meter between the purple wire and a good ground. Key on engine off. If it reads 5v then replace TPS. If not the leave meter hooked up and unplug the MAP (front of engine on upper intake). If meter now reads 5v then replace MAP. If not then hook up that plug and unhook the EGR (back top of engine under the throttle body). Check and if need repeat with the A/C press. transducer (3 wire sensor in A/C hose near compressor). All of these share a sensor feed from the PCM. the most likly problem is a short in the MAP but a short in any of these sensors can cause the problem you describe.

First chk. all fuses and bulbs. There is a backup light switch under dash either on steering colume or someplace close. plate lights should be hooked in with running lights, If bulbs are ok chk for wire unhooked or bad ground. can't help on diagram.

pull the old fuse panel away from the bracket and replace them one at a time in the same position to the new one as the old...
make sure the battery is unhooked as well.

Robert