With Auto-dimming Mirror

Disconnect the negative battery cable.
Remove the inner garnish. (See INNER GARNISH REMOVAL/INSTALLATION .)
Remove the front door trim. (See FRONT DOOR TRIM REMOVAL/INSTALLATION .)
Disconnect the power outer mirror connector.
Connect the power outer mirror connector terminal E to a dry cell battery's plus (+) terminal (1.2 V) and terminal F to its minus terminal.

Fig 1: Connecting Power Outer Mirror Connector Terminal E To Dry Cell Battery's Plus (+) Terminal (1.2 V) And Terminal F To Its Minus Terminal
Courtesy of MAZDA MOTORS CORP.
- Verify that the mirror side of the outer mirror glass changes color.
If there is any malfunction, inspect the outer mirror glass. (See OUTER MIRROR GLASS INSPECTION .)

If there is no malfunction in the outer mirror glass, replace the power outer mirror. (See POWER OUTER MIRROR REMOVAL/INSTALLATION .)

Fig 2: Outer Mirror Glass Voltage Reference Graph

Courtesy of MAZDA MOTORS CORP.