How can I open trunk on 2006 hhr chev car - 1999 Subaru Impreza

Unplug it

Just type in on pc, TSB service bulletins for 06 chevy HHR. it should come up for you. when the page comes up, click on the 4th link down. good-day!

IS YOUR BATTERY VOLTAGE UP TO SNUFF

have you checked the child lock their should be a small little switch on the door near the catch.

You may need a shop manual to get the testing procedures.
Code 303 is for a miss on cylinder 3 which could be ignition or fuel related.
Code 1174 is for a problem with the fuel trim which could be due to the problem with cylinder 3 or something else.

remove the rear seat ; if needed; crawl to the back of the hatch and release the hatch lock from inside using a blade screwdriver or, have a locksmith at the dealer make a new key by code using your vin number

Yeah it has a fuse for all electrical functions.

there is a releas hatch on get into the trunk take off the little gray peice on the talgat itself get a long flat tool and opean it

the battery is in the trunk of the car you just need a new fuse uder the hood fuse box battery in trunk by spare tire

Got to go to dealer. They use a Tech 2 scanner to communicate with the computer module.