This instructable is for making the fix wiper movement of older cars (mine is a 1998 kia pride) to have an intermittent movement. The fix is easy because it is installed near the wiper switch and cheap because it costs me only 90 PHP or around 2 USD only.

Step 1: Prepare the Tools and the Materials.

A. Tools
     Multimeter - for examining the car's wiper control circuit.
      Soldering Iron - for building the delay circuit.
B. Materials 
     Resistors (all are 1/4W) - 100K, 4K, 10K, 3.3K
     1 variable resistor, 250K
     1 electrolytic capacitor, 24V, 100uF
     1 2N4403 transistor
     1 2N4401 transistor
     1 1N4002 diode
     1 5A Relay, SPDT type
     Soldering lead


Step 2: Build the Delay Circuit

Build the delay circuit according to the schematic and photo provided on this step.
Note that I did not use a PCB in order to make the construction compact.
Use a masking tape to fix the other components on the sides of the relay then solder.

Step 3: Label the Wires and Cover the Construction.

Attach labels on the wires according to the connection of the schematic provided in step 2.
After attaching the label, cover the construction by tape so to make it insulated.

Step 4: Find the Wires to Be Connected in Your Car.

Remove the lever switches covers in the steering wheel assembly.
Find the wires to be cut and connected to the delay circuit. The attached schematic in this step is your guide.
Hint: By turning on/off the wiper switch, monitor the voltages in the connector to find the right wire.

Step 5: Last Step: Connect the Delay Circuit

Connect the delay circuit as shown on the attached schematic.

Note: You can replace the variable resistor of the delay circuit into a volume control knob in order to adjust the delay while driving. In my case, I just leaved it fix first until I have time to plan where to put the variable resistor in the car.
It only moves the wiper in segments... Could it be modified to pause between complete sweeps of the wipers?
<p>Are you wanting to be able to stop the wipers when they are not in the folded down positition?</p>
The pause time is adjustable through the variable resistor. Try adjusting it.
That only creates longer pauses between the short movements, the wipers need to do a full range of movement then pause! Any chance you have a more detailed diagram of how it's wired in the car? Thanks :)
<p>In between what timeframe is this adjustable? I got a filter heater in my car that uses 16A and goes to 90degrees celsius before the thermostat shuts it off. It's too high effect and it always goes so hot it turns itself off for a while. Stupid design but yeah, I'd like to solve it with a circuit that turns it on and off. But I don't know the time, might be half a minute up to two minutes needed. Will this do?</p>
<p>Sir andrew thank you.. its works great.</p>
<p>Just want to say, fabulous circuit. I made it for my old car and it works great :) However there is an error in the drawing. R4 should be 47 K ohms (not 4K). FYI: should you want a fixed 6 or 7 second delay between sweeps, the pot should be replaced with a 38 K ohm resistor.</p>
<p>Hi @Brian Cook, I'm glad to know it worked in your car and I'm sorry for the wrong schematic as it should be actually 47K. </p>

About This Instructable




Bio: Current: Product Support Engineer, SMPS products (From 2008) Previous: Product Support Engineer, UPS products ( 2 years) Manufacturing Support, Optical Disc Drive products (9 years)
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