When driving after dark, the automatic dimming rearview mirror reduces the glare from headlights behind you, based in inputs from the mirror sensor. This feature is always active.
The auto dimming function cancels when the shift position is in R.
Honda Civic Service Manual. Brake Booster Removal and Installation (Natural Gas models)
1.
Vehicle Lift
1.
Raise the vehicle on a lift, and make sure it is securely supported.
2.
Steering Joint Cover
1.
...