Assuming you would like tips on opening a windshield wiper switch:
Tools Required:
-Screwdriver (if necessary)
-Pair of pliers (optional)
The process may vary depending on the model and make of your car but these instructions should be general enough to get you started.
1. Locate the windshield wiper switch. This is usually located on the lower left corner of the steering column, near where your knee would rest while driving. In some cars, it may be located on the dashboard near the driver’s side door. If you can’t find it, consult your car’s owners manual for its location.
2. Once you have found the switch, take a look at how it is mounted. In most cases, the switch will either be screwed into place or held in with a spring clip. If it is screwed in, use a screwdriver to remove the screws holding it in place and pull the switch out far enough so that you can see behind it. If it is held in with a spring clip, use a pair of needle nose pliers to squeeze the sides of the clip together and release it from its mount. You should now be able to see behind the switch and access its wiring harness.
3a). Identify which wire is connected to each terminal on the back of the switch using a multimeter set to Ohms mode or by testing continuity with a continuity tester if your multimeter does not have an Ohms mode.. OR 3b).If you don't have access to those tools, simply disconnect all wires from their terminals one at a time until only two wires remain connected to their terminals.. These two remaining wires are what control power to your wipers so make note of which terminal each wire is connected too as we will need this information later when we reconnect everything.. 4). With only two wires remaining connected, test for power at each terminal using either your multimeter set to DC Volts mode or by touch test.. The goal here is to determine which wire connects to ground (usually black or brown) and which wire carries voltage from your battery (usually red or yellow) 5). Now that we know which wires go where, we can begin reassembling everything by reversing steps 2-4.. Be sure connect all other wires back into their proper terminals before moving on step 6!.6). Reconnect negative (- / black