1. Disconnect the negative battery cable..
2. Remove the side speaker grille..
3. Remove the tweeter..
4. Verify that the resistance between the tweeter terminals is as indicated in the table.

If not as indicated in the table, replace the tweeter.
Without Bose®

With Bose®

Supplier Identification Procedure [Audio]
Tweeter Removal/InstallationHeadliner
Purpose/Function
The headliner is equipped with a shock absorbing pad for driver's head protection
during a collision.
Construction
The front and rear side of the headliner is equipped with a shock absorbing
pad with a plastic rib-pad structure.
...
Ignition System [Skyactiv G 2.0]
Outline
A direct ignition coil for independent ignition control has been adopted.
An ignition coil built-into the ion sensor has been adopted.
An iridium spark plug has been adopted.
Structural View
Structure
Consists of the following parts:
...
Positive Crankcase Ventilation (PCV) Valve
Purpose, Function
Prevents release of blow-by gas (unburnt gas) into the atmosphere.
The PCV valve is open/closed by the intake manifold vacuum.
Construction
The PCV valve is installed to the oil separator.
The PCV valve consists of a spring and valve.
...