The headlight washers & wipers will automatically work for 2 "sweeps" when the windscreen washers are operated. You should be able to see them moving across the beam pattern against a wall or with a 2nd person observing. You cannot operate them separately.
If they do not work - further investigation will be required ( fuses, seized motors etc ).
We have a 2002 S-80. The headlight wipers work automatically when you use your windshield washer fluid to wash your windshield.
I believe that normally headlight wipers only work occasionally, at set intervals when the car thinks that they may be dirty.
Begin by removing the wiring harness from the back of 2004 Volvo headlight. Remove the headlight assembly retaining bolts. Reverse the process to install your new headlight assembly.
The headlight relay on a 2004 Volvo S40 is located in the engine compartment fuse box. To access it, open the hood and look for the fuse box, which is typically near the battery. The specific relay for the headlights is usually labeled on the fuse box cover. Refer to the vehicle's manual for exact locations and diagrams.
To replace a headlight lens on a 2004 Volvo S80, start by opening the hood and removing the screws or bolts securing the headlight assembly. Carefully detach the assembly from the vehicle and disconnect the wiring harness. Replace the lens by either removing the old lens and securing the new one, or replacing the entire headlight assembly if needed. Finally, reconnect the wiring harness, reattach the assembly, and secure it with screws or bolts.
this should help: http://www.matthewsvolvosite.com/forums/viewtopic.php?f=9&t=14819
To change the headlight lens on a 2004 Volvo V70 R, start by opening the hood and removing the screws or bolts securing the headlight assembly. Carefully pull the assembly out from the vehicle, disconnect the electrical connector, and remove any retaining clips. Replace the old lens with a new one, reattach the assembly, reconnect the electrical connector, and secure it back in place with the screws or bolts. Finally, test the headlights to ensure they function properly.
To replace the right turn signal on a 2004 Volvo S60, first, open the hood and remove the plastic cover over the headlight assembly by unscrewing the retaining screws. Next, disconnect the electrical connector from the headlight housing and carefully pull the housing out. Locate the turn signal bulb socket, twist it counterclockwise to remove it, and then replace the old bulb with a new one. Finally, reassemble the headlight assembly and ensure everything is securely fastened.
The 2004 Volvo XC70 has 20 valves.
The 2004 Volvo XC90 has 20 valves.
The 2004 Volvo C70 has 20 valves.
The 2004 Volvo S80 has 20 valves.