How to Test a Power Window Switch with a Multimeter
by bqylq
Power window switches are an essential part of many vehicles, but they can also be a source of frustration when they stop working. If your power window isn’t working, one of the first things you should check is the switch itself. You can use a multimeter to test the switch for continuity and voltage.
Tools and Supplies
- Multimeter
- Test light (optional)
Instructions
- Disconnect the negative cable from the battery.
- Remove the door panel to access the power window switch.
- Locate the power window switch connector and disconnect it.
- Set the multimeter to measure continuity.
- Touch the multimeter probes to the two terminals on the power window switch connector.
- Move the switch lever up and down. If the multimeter beeps, the switch has continuity and is working properly. If the multimeter does not beep, the switch is not working and needs to be replaced.
Testing for Voltage
If the switch has continuity, you can also test it for voltage. To do this, set the multimeter to measure voltage. Touch one probe to the power terminal on the switch connector and the other probe to a good ground. The multimeter should read 12 volts. If it does not, the switch is not receiving power and needs to be replaced.
Troubleshooting
If the power window switch is not working, there are a few things you can check:
- Fuse: Check the fuse for the power window switch. If the fuse is blown, replace it.
- Wiring: Inspect the wiring for the power window switch. Make sure the wires are not loose, corroded, or damaged. If the wiring is damaged, it will need to be repaired or replaced.
- Motor: If the switch and wiring are good, the problem may be with the power window motor. You can test the motor by applying 12 volts directly to the terminals. If the motor does not run, it needs to be replaced.