Rear Wiper Intermittent Delay Timer Mod

[CTScott]

Originally Posted by toy_toronto

Trying to implement a delay for the fronts, I inserted the module in line with pin 3 of D6 (blue) as you suggested and turned on the module --for each interval the motor receives a pulse but leaves the wiper in odd positions

I was looking at the EWD of the wiper switch assy. and noticed it might be possible while the switch is in the OFF position perhaps I can supply +12v to pin 1 (+S white) to make the wiper swipe then go back to "park" position... but I could be reading the diagram wrong, lol.


-toy

+S is the feedback from the cam switch, which tells the circuit in the stalk when it is OK to drop power and have the wiper land in the correct place. You can try connecting pin 2 to pin 3, which is what happens when you tap the stalk for mist mode.

This is what made life easier with my module, as I use a microcontroller, so I can program time intervals, rather than having to calculate RC time constants.

On another note, I got the Lexus EWDs last night and have bad news about your stalk. The RX330 with the "rain-sensing wipers" has an ECU that takes the sensor input and controls the wipers. It takes the place of the circuit that is built into our OEM stalk or the Prius, etc. ones with the intermittent fronts. This means that your stalk alone will not do the intermittent thing. You would either need the Auto Wiper ECU, or could use the Lexus stalk and use the auto position for your module. The "sensitivity" ring is just a potentiometer connected to pins 7 and 8, so you could use that in place of the pot on your board. It goes from 0 to 3.2K ohms.