Kia Optima: Opening the hood
1. Pull the release lever to unlatch the hood. The hood should pop open slightly.
WARNING
Open the hood after turning off the engine on a flat surface, shifting the shift lever to the P(Park) position for automatic transaxle and to the 1st(First) gear or R(Reverse) for manual transaxle, and setting the parking brake.

2. Go to the front of the vehicle, raise the hood slightly, pull the secondary latch (1) inside of the hood center and lift the hood (2).
3. Raise the hood. It will raise completely by itself after it has been raised about halfway.
Hood
Closing the hoodRemoval
The side airbag cannot be disassembled from the seat back assembly, so replace
the seat back assembly when replacing the side airbag. ...
Why didn’t my air bag go off in a collision? (Inflation and non-inflation conditions
of the air bag)
There are many types of accidents in which the air bag would not be expected
to provide additional protection.
These include rear impacts, second or third collisions in multiple impact accidents,
...
Schematic Diagrams
System Block Diagram
...