delay wiper for fj40's

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Is the 74' earlier top mount wipers be the same wiring wise as the later bottom mount wiper system?

I have a top mount wiper system/windshield for my build.

Really would like delay wiper function! :-)

Allen
 
For all whom are contemplating using the Mitsuba Wiper Delay Module to get intermittent wipers:

I have received the unit and took it apart to show everyone the guts. This version of it does NOT have the connector on it as shown in a post above, just 6 wires coming out of it. It is also built with discrete components, just like Toyota old school stuff, ie no IC chips. There is a bunch of caps/resistors, three transistors, and a mechanical relay with both NO and NC contacts so it can be used for ground or positive wiper switching systems. It even uses the old brown circuit boards just like the Toyota boards. The funny thing is? It even SMELLS like it's old school :D

IMG_1656W.webp
IMG_1659W.webp


The lack of a connector complicates the implementation of a true plug and play install. Each person will have to ship me their unit
so I can modify it. This will add to the overall cost of this implementation of a wiper delay.

Here is what I propose for the 73-77 FJ40:

Build an adapter using 6 pin connectors that goes between the harness plug and the wiper/washer switch. This adapter also will split out the washer motor signal wire and feed it to the Mitsuba module. This is for the cool feature that when you activate the washer motor by twisting the washer knob, the module causes the wipers to run for two seconds automatically.

Build adapter "tees" that tap into the Cigar Lighter power feed connections for the required +12V and ground signals. These would plug into the existing connectors and allow you to power the module AND still have the lighter work.

The end user will have to unplug the wiper switch and cigar lighter connections, plug the adapter into the wiper switch and wiper harness connector and plug the adapter "tees" into the cigar lighter +12V and ground then reconnect the lighter connectors.

I am going to build one of these this week and test it. I will post back with completed pictures and thoughts.
 
Hey Mark, can the Mitsuba Wiper Delay Module be set up to work with the 74' earlier single motor top mount washer system?

Even if the wiper system needs to be rewired it would still be worth it.

Allen
 
Coolerman said:
For all whom are contemplating using the Mitsuba Wiper Delay Module to get intermittent wipers:

I have received the unit and took it apart to show everyone the guts. This version of it does NOT have the connector on it as shown in a post above, just 6 wires coming out of it. It is also built with discrete components, just like Toyota old school stuff, ie no IC chips. There is a bunch of caps/resistors, three transistors, and a mechanical relay with both NO and NC contacts so it can be used for ground or positive wiper switching systems. It even uses the old brown circuit boards just like the Toyota boards. The funny thing is? It even SMELLS like it's old school :D

View attachment 1217775 View attachment 1217776

The lack of a connector complicates the implementation of a true plug and play install. Each person will have to ship me their unit
so I can modify it. This will add to the overall cost of this implementation of a wiper delay.

Here is what I propose for the 73-77 FJ40:

Build an adapter using 6 pin connectors that goes between the harness plug and the wiper/washer switch. This adapter also will split out the washer motor signal wire and feed it to the Mitsuba module. This is for the cool feature that when you activate the washer motor by twisting the washer knob, the module causes the wipers to run for two seconds automatically.

Build adapter "tees" that tap into the Cigar Lighter power feed connections for the required +12V and ground signals. These would plug into the existing connectors and allow you to power the module AND still have the lighter work.

The end user will have to unplug the wiper switch and cigar lighter connections, plug the adapter into the wiper switch and wiper harness connector and plug the adapter "tees" into the cigar lighter +12V and ground then reconnect the lighter connectors.

I am going to build one of these this week and test it. I will post back with completed pictures and thoughts.
Click to expand...
Slick idea!
 
abosely said:
Hey Mark, can the Mitsuba Wiper Delay Module be set up to work with the 74' earlier single motor top mount washer system?

Even if the wiper system needs to be rewired it would still be worth it.

Allen
Click to expand...
Yes it can.
 
During some research to see which wire has to be switched for the wiper delay system, I found that for different year FJ40's different wires were used. Here is a list of what the schematics say the low speed wire is:

1983 I have no schematic for this year
1982 has the LR as low speed AND this is the start of the schematic that makes no sense. It appears to switch hot but it shows no ground for the motor so how does it work?
1981 has the LR as low speed
1980 has the LR as low speed
1979 has the LR as low speed
1978 has the LR as low speed
1977 has the LB as low speed Possible schematic error?
1976 has the LR as low speed
1975 has the LR as low speed
1974- 1969 has the LB as low speed but also has the switched LW/LB wires at the connector switch
pre 69 has a completely different set up and I have not researches this one yet

So what does this mean? Don't ASS-U-ME just because one schematic shows it one way, that all years work that way...
 
If- 82 was the first year of the mechanical delay relay it could switch to that relay instead of the wiper motor....

Pete
 
To my knowledge, in the US there was no OEM wiper delay for the FJ40 at least up till 1982 which is the last year I have a schematic. The FJ60 had them but I don't know when it started.

The 1982 FJ40 schematic clearly shows the motor being connected to hot on both sides. My only guess is that the motor is grounded (though not shown) and the motor uses two brushes to achieve each speed. I'm not an electric motor guru. Maybe someone who is could look at that and figure it out?

If someone has a good scan of a 1983-84 FJ40 schematic, please send it to me!

Haynes1982FJ40Page2W.webp
 
I had the motor apart on my FJ60 once, seems to me it had three brushes that came flinging out on me. This was in a dimly let unfisinshed garage, very cold, and the wipers had quit dead on me earlier in a snowstorm, turns out the linkage had come off the ball on the back of the motor case. Either way, sticking three brushes back in is a pain in the butt. The diagram above, I bet is showing the three brushes. I'm no motor guru either, but the comments above on multiple brushes may make sense, two run one speed and two run the other, but one is used commonly. That would match the dual hot leads coming into the motor on the diagram. Also I know the FJ60 motors are ground with a small ground wire with a ring terminal to a stud on the firewall where the whole thing mounts. I suspect the FJ40 of that vintage was the same.
 
Coolerman said:
...
If someone has a good scan of a 1983-84 FJ40 schematic, please send it to me!
Click to expand...

Hi Mark

Is what I put in post#17 insufficient? (This shows the "wiper part" of the 1983 40-series wiring schematic).

:beer:
 
Photos for the record:
modification to the outer wiring
Aussie wiring
2012-06-10_11-56-18_686.jpg


Desolder and remove the ground wire (black)
2012-06-10_11-56-34_943.jpg


2012-06-10_11-56-46_303.jpg

and relocate the remaining 3 wires (pic 1 below is original configuration)
2012-06-10_11-56-58_601.jpg


This is the modified configuration:
2012-06-10_12-52-31_732.jpg
 
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Inside:
It is made to run intermittently as well.
2012-06-10_12-52-55_58.webp


The three contacts:
2012-06-10_12-53-36_900.webp


Interior brush wire modification:
USA on left Aussie on right
2012-06-10_19-51-08_38.webp
 
You are correct there is something wrong with that schematic. The motor has three brushes, high speed brush, low speed brush, and a common brush. On the 40 ( I believe all) the common brush was connected to +12V. To go slow the low speed brush was grounded, to go fast the high speed brush is grounded. When parking, the park switch connects the low speed brush to +12V to brake the wipers in the park position. It should show something like this ( I think this is for an 81 FJ40):



2008260
 
Yessir. The FJ60 relay works too. You also have to rearange the wiring between the relay and the motor. Now, if you can pull OEM LHD FJ40 wiper motors out of your stash of unobtainium, I will be thoroughly impressed. :cool:
 
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