Lock Release Solenoid Inspection

Disconnect the negative battery cable.
Remove the rear door lower trim. (See REAR DOOR LOWER TRIM REMOVAL/INSTALLATION .)
Disconnect the lock release solenoid connector.
Measure the resistance of the lock release solenoid individually.
- If not within the specification, replace the front seat belt.
Standard 54-66 ohms

Fig 1: Measuring Resistance Of The Lock Release Solenoid
Courtesy of MAZDA MOTORS CORP.