Rear Wiper Intermittent Delay Timer Mod - Toyota Yaris Forums

Lil Abner · 07-29-2011, 05:09 PM

Well, I know if the "ON" pulse isn't long enough, the motor will stick. Looking at your schematic, R4 and C2 control your "ON" pulse. The equation for time is:
T(on)=0.7*R*C
R4=10K ohms, C2=100uF=0.0001F
T(on)=0.7*10,000*0.0001
T(on)=0.7 sec

The only think I can think of is replacing R4 with a resistor around 14.7K or 15K. That would give about 1 second. Or just try that equation out and see.

Since you have the wires taken apart, you could also try this. Turn the wipers on low (not delay), and leave the wires disconnected. Quickly jump the blue wires together, and quickly disconnect. Try doing that slightly longer each time, until the wipers work properly. What you're trying to determine is the required ON pulse length needed by your module.

When I did my module, I only worried about the rear wiper, so I don't have any timing numbers for the front.

So you got the EWD for that switch? I'd hope it's simple, like you're saying, to just supply a ground and/or positive to one or all of those 3 little pins on the larger plug!

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07-29-2011, 05:09 PM	#21
Lil Abner Drives: 2009 3dr LB Manual Join Date: Mar 2010 Location: Dublin, Ohio Posts: 412	Well, I know if the "ON" pulse isn't long enough, the motor will stick. Looking at your schematic, R4 and C2 control your "ON" pulse. The equation for time is: T(on)=0.7RC R4=10K ohms, C2=100uF=0.0001F T(on)=0.710,0000.0001 T(on)=0.7 sec The only think I can think of is replacing R4 with a resistor around 14.7K or 15K. That would give about 1 second. Or just try that equation out and see. Since you have the wires taken apart, you could also try this. Turn the wipers on low (not delay), and leave the wires disconnected. Quickly jump the blue wires together, and quickly disconnect. Try doing that slightly longer each time, until the wipers work properly. What you're trying to determine is the required ON pulse length needed by your module. When I did my module, I only worried about the rear wiper, so I don't have any timing numbers for the front. So you got the EWD for that switch? I'd hope it's simple, like you're saying, to just supply a ground and/or positive to one or all of those 3 little pins on the larger plug!