- A) fuse and/or circuit breaker check.
- b) checking the integrity of the wires from the switches, the reliability of their connections. Checking the health of the switch.
- V) checking the condition of the wiring and lock drives under the door trim panel, checking the drive rods (on car parts), to make sure they are not bent or damaged (the lock drive can be checked by briefly applying battery voltage to it - a click indicates the health of the drive solenoid).