WiperModule

Simple relay board to control automotive wiper motor from digital outputs

This board was created when I needed a way to control a MK2 VW wiper motor using outputs from my PDM.

Many PDMs require either external relays to drive wiper motors or use specific outputs designed to handle the wiper motor braking functionality.

Rather than include this specific feature on the PDM, I opted to create a simple relay board that can be placed inbetween the PDM and the wiper motor.

This setup also allows me to use 1 high current output to drive the motor at low speed or high speed, and one low current output to control that speed.

Wires are connected to the board using Deutsch DT 4 pin connectors

Wiring

Pin	Function
1	Fast Input
2	Ground
3	Park Switch
4	Slow Input

Connection Table

Slow Input Level	Fast Input Level	Slow Output Connection	Fast Output Connection
L	L	Ground	Not Connected
H	L	Slow Input	Not Connected
L	H	Ground	Not Connected
H	H	Not Connected	Slow Input

Renderings