- Checking system fuses and/or circuit breaker (where is it available).
- Check switch wires for broken wires and loose contacts. Checking switches for continuity.
- Remove the panel (panels) door skin and check the actuator wiring terminals for looseness or damage. Inspect the actuator stems to make sure they are not bent or damaged. The drive can be tested by quickly connecting battery power. A strong click will indicate that the solenoid valve is working properly.