It's crusty. It's old. It's broken | Wiper Motor Upgrade

This wiper motor is old, crusty, and more importantly, not designed for a modern PDM. Let's fix that.

In this video, we tear down our old Toyota FJ40 wiper motor and rewire it to function with a MoTeC PDM (Power Distribution Module), which switches power instead of ground. Not sure what that means, no problem, Caleb here will explain. You'll also see how the internal gear and park circuits operate, how to reverse wiring logic safely, and why this setup makes the motor spin backwards... and how that isn't actually a problem.

Wiper motor wire colours are also covered along with DC motor control, contact logic, and how to modify old components for modern electronics while improving reliability.

Perfect for anyone doing a restomod or trying to integrate modern electronics with factory hardware.

While this unit is for a Toyota FJ40, this technology is not specific to that one vehicle. This general knowledge will apply to many other vehicle models and their wiper motor setups.

NOTES:
DC wiper motor wiring colours and function (stock):
Red = 12v
White = Park Output (where to stop)
Black = Chassis Ground
Blue = Fast Speed
Green = Slow Speed

PDM = MoTeC PDM15 Power Distribution Module
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TIMESTAMPS:
0:00 - Out with the old
0:20 - Coming Up
0:40 - Old Motor
1:00 - Replacement
1:18 - Why Rewire?
1:35 - Wire & Solder Upgrade
1:58 - HPA Wiring Fundamentals
2:06 - DC Motor Wiring
2:36 - Wiring Colours
3:21 - Contacts/Controls
3:53 - Bench Testing
4:23 - How The Wipers Stop
4:46 - PDM Setup Alteration
5:16 - Motor Will Go Backwards
5:35 - How The Wiper Motor Works
6:55 - PDM Problem
7:57 - Knowledge Is Power
8:13 - What Are You Working On?