Hatchback (5HB)

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Perform the following procedure:
Rear turn light bulb (LH) removal:
1. Remove the service hole cover (LH).
Fig 1: Removing Service Hole Cover Tab
Courtesy of MAZDA MOTORS CORP.

Rear turn light bulb (RH) removal:
1. Turn the knob counterclockwise and release the lock.
  
  Fig 2: Turning Rear Turn Light Bulb Knob Counterclockwise
  Courtesy of MAZDA MOTORS CORP.
2. Remove the service hole cover (RH).
Turn the socket counterclockwise and remove it in the direction of arrow (1) shown in the figure.

Fig 3: Turning Socket Counterclockwise
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- If there is oil or dirt on the surface of the light bulb, excessive heat will build up and the life of the light bulb will be shortened. If the light bulb glass area is touched, wipe off any dirt using a soft cloth dampened with detergent diluted in water (approx. 5%).
Remove the rear turn light bulb.

Fig 4: Removing Rear Turn Light Bulb From Socket
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.