When pressing down on the ignition button of my 2011 Toyota Highlander V6 Limited, the car went dead, no electrical power.

SOURCE: p1135 code 2002 toyota highlander

DTC P-1135 indicates that the heater portion of the Air-Fuel sensor either has an open or a short. This unit is not repairable; so you will need to replace it. The vehicle IS drivable with this code stored, as the heater simply "heats" the sensor, bringing it up to its operating temperature (640 degrees F.) Replace it with a Toyota part, "aftermarket sensors do not work well. Quite a common problem.

SOURCE: i am looking for a diagram on a 02 toyota

You don't need one. Get a T belt from toyota. It has 3 white lines on it and and arrow mark. 2 lines are solid and one is broken. Put the arrow facing away from the engine. The cam gears have a dot punched into them near a certain tooth. This is where the solid white lines will line up with. The crank gear will have a dot also. It will line up at 90 degrees from the top, towards the front of the car. This is where the broken line will match up with. With the belt installed with all lines on their proper dots and arrow away from the engine, you valve timming is correct.
Of course you need to remove and compress the tensioner also. I assume you know this already since you didn't ask.

SOURCE: need serpentine belt adjusted

You cant adjust the belt tensioner. You have to replace it if it wont provide the proper tension.

SOURCE: oil burning in my 2001 toyota highlander 84000 miles. bad rings.

You need to talk to a dealer.

SOURCE: 2006 highlander hybrid limited owners manual download

The below site can provide a 'vehicle reference manual.' not the actual original owners manual. It is free, hope it has the info you need
http://qrg.toyotapartsandservice.com/

Testimonial: "Thanks for the replay.I could find the manual for 2006 Highlander and 2009 Highlander Hybrid.Is there a user manual for 2006 Highlander Hybrid Limited"