With 360° View Monitor System

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Trunk lid recess (See TRUNK LID RECESS REMOVAL/INSTALLATION .)
2. Trunk lid trim (See TRUNK LID TRIM REMOVAL/INSTALLATION .)
3. Rear mount camera (See REAR MOUNT CAMERA REMOVAL/INSTALLATION .)
Prepare four dry cell batteries (1.5 V)
Connect the four dry cell batteries in a series.

Fig 1: Connecting Four Dry Cell Batteries In Series
Courtesy of MAZDA MOTORS CORP.
Connect the positive pole of the dry cell battery to rear mount camera terminal B, and the negative pole to terminal C.

Fig 2: Connecting Positive Pole Of Dry Cell Battery To Rear Mount Camera Terminal B And Negative Pole To Terminal C
Courtesy of MAZDA MOTORS CORP.
With the cell batteries being connected, measure the waveform between rear mount camera terminal A and terminal C.
Verify that waveform A shown in the figure below is displayed two times or more.

Fig 3: Rear Mount Camera Terminal Waveform
Courtesy of MAZDA MOTORS CORP.
If the voltage is not as shown in the figure below, replace the rear mount camera.