Your vacuum system has a leak. If both of your doors stopped working at the same time, I would check up stream from the actuators. Check out docrebuild.com for diagrams and the parts.
Not usually. Disconnect it and see what happens.
The VW polo has headlight bulbs. If the headlights are not working, it may be a bulb has burnt out.
If the headlights are not working correctly on a 1990 Corvette, the fuses or lights could be going out. Replace the old fuses and check that all wires connected to the lights are functioning correctly.
If just one headlight quit working it probably burned out. If both headlights quit working at the same time the fuse probably blew.
Check the fuses. If they are good then you will have to replace the headlight switch.
The first thing I would check would be the headlight fuses. (There may be one fuse per headlight.) Also, examine the headlights carefully for any damage.
usually happens when the headlights are plastic its usually caused by condensation or either a small crack in your head lights as for getting the headlight working check the wiring and fuses or it could possibly just be a bad connection.
bad headlight switch
1. You have a busted headlights. 2. You have a busted fuse for the headlight. 3. Have an Electrical wiring connection problem. 4. No battery charge
There are several possibilities; headlight switch, headlight breaker or fuse, connectors, dimmer switch.
If parking and tailights are working could be headlight switch--rheostat for dimming control could be bad
check the fuse panel for blown fuse/check headlight switch