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Old 06-27-09, 06:59 PM   #1
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windshield wiper motor wiring

I have looked at the FSM wiring diagram and can't figure it out.

I am wiring the car from scratch, it's a race car and doesn't have that many things to control.

The wiper motor has 5 wires, 1 black and 4 blue. I am just hooking up the high speed setting to a an on/off toggle. I grounded the black and put 12v on each of the blue wires and a combination of blue wires, can't get anything out of the wiper motor. Even did the same thing on a spare wiper motor. Only 3 of the blue wires actually go into the motor, one is soldered to a pin on the wiper motor outside housing.

Any help on which wires get 12v to run the wiper on high?

Thanks
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Old 06-27-09, 08:05 PM   #2
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On a normal car the wipers work as follows. The key is put to ON. That puts power on the pure blue wire of the wiper motor as shown in the attached jpg.

Then the driver puts the wiper switch to ?????? high??? speed. When he does that he puts a GROUND on the Blue/Red wire at the wiper motor. The motor now runs.

So if all you have is a wiper motor, put a permanent gnd on the BLACK wire shown in the attached jpg. Then put a Switched source of power to the pure BLUE wire on the wiper motor.

Then touch the Blue/Red wire to any ground available. Wipers should work. IF they don't.......write back and I'll be darn if I know why it wouldn't work.


It's the same thing if you have a bad wiper switch. Just pull the plug off the switch and put the Blue/Red wire at the switch plug to ground. Wipers work if the key is put to ON.
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Old 06-27-09, 09:11 PM   #3
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oh man, I needed this so bad lol.
I was wondering how to test the wiper motor to see if it was bad. Mines, like so many other fcs, the wiper only works on low, but it comes on sometimes.

now I can finally test it out lol.
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Old 06-28-09, 08:08 AM   #4
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Quote:
Originally Posted by HAILERS2 View Post

So if all you have is a wiper motor, put a permanent gnd on the BLACK wire shown in the attached jpg. Then put a Switched source of power to the pure BLUE wire on the wiper motor.

Then touch the Blue/Red wire to any ground available. Wipers should work.
Exactly what I was looking for. THANKS!
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Old 06-28-09, 06:15 PM   #5
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oh man, I needed this so bad lol.
I was wondering how to test the wiper motor to see if it was bad. Mines, like so many other fcs, the wiper only works on low, but it comes on sometimes.

now I can finally test it out lol.
It's a cold day in hell when the wiper motor itself goes bad. Its almost always the wiper switch that is bad and what goes bad is one of the soldered in relays inside the switch.

But to see if the motor works in high/low, just key to ON, then with a piece of wire bare at each end, shove one end of that wire in the back of the wiper motor plug where the blue/white wire is. Motor should move when the other end of the wire is touched to a nearby gnd. Then put the wire in the back of the blue/red wire and repeat. It's best to put water on the windshield or remove the wiper arms prior to doing this so you can tell the diff in wiper speeds.
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Old 07-27-09, 02:09 PM   #6
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I have a similar problem.

I installed a standalone EMS and had deleted the engine wiring harness and ECU. Unfortunately this also makes it so I can't get the wipers to work. I would like them to work as the car did stock, and not just a toggle, but is this even possible? I'm fine making my own harness, but I'm under the impression that the ECU controls the wiper speeds.
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Old 07-27-09, 04:27 PM   #7
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Assumimg you only removed your EM harness and left the FRONT harness in place, you'll find the wiper wires in one of the two ORANGE in color plugs called FEM-01 in the wiring diagram attached. Just run the wires from the ORANGE plug to the plug that will go on the wiper motor.

The BLACK wire should just be terminated on the firewall near the wiper motor. There is no BLACK wire for wipers in the ORANGE COLORED plug.

ECU has zippo to do with wipers.
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Old 07-29-09, 08:40 AM   #8
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Assumimg you only removed your EM harness and left the FRONT harness in place, you'll find the wiper wires in one of the two ORANGE in color plugs called FEM-01 in the wiring diagram attached. Just run the wires from the ORANGE plug to the plug that will go on the wiper motor.

The BLACK wire should just be terminated on the firewall near the wiper motor. There is no BLACK wire for wipers in the ORANGE COLORED plug.

ECU has zippo to do with wipers.
Wow dude, I'm speechless. You kick all kinds of *** at this. Thanks eternally, I'm going off to wire this in now...
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Old 02-11-10, 05:58 PM   #9
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going out to the garage to try this now! I dident know it was a switched ground system, figured that you apply current to one of the various wires and that gives you the speed selected.

cheers!
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Old 02-11-10, 07:21 PM   #10
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The harness that fits on the engine is the EM harness and it also carrys the wiper wires. The attached jpg is of someones EM harness that he laid out on his garage floor. I pointed in the jpg to the two ORANGE colored plugs that interface b/t the EM harness and the F or front harness. The fifteen pin orange in color plug is the one that carrys the wiper wires.

Something like that.

And yeah, the wiper switch just put a gnd on either the blue/red wire or the blue/white wire to make the wipers work. Of course the other wires at the wiper motor have to be there, like the power wire which has power any time the key is to ON.
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Old 01-10-12, 05:47 PM   #11
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great write up this helped alot
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Old 10-13-12, 07:42 PM   #12
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what happens if the motor is bad ? i get little sparks if i attach the blue/red wire at the back of the window wiper plug to ground , my wipers did a little jump but nothing going , tryed at the back of wiper motor plug too and same result
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Old 10-13-12, 08:20 PM   #13
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can you please help me really want to get them working ...... what happens if the motor is bad ? i get little sparks if i attach the blue/red wire at the back of the window wiper plug to ground , my wipers did a little jump but nothing going , tryed at the back of wiper motor plug too and same result
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Old 10-13-12, 09:20 PM   #14
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can you please help me really want to get them working ...... what happens if the motor is bad ? i get little sparks if i attach the blue/red wire at the back of the window wiper plug to ground , my wipers did a little jump but nothing going , tryed at the back of wiper motor plug too and same result
You might want to try disconnecting the plug to the wiper, but pay attention to which terminal the Black wire went to, which terminal the Blue wire went to and which terminal the Blue/Red wire went to. Run a ground wire from the battery to the terminal that the Black wire would go to. Run a voltage wire from the Battery to the terminal that the Blue wire would go to. And run another ground wire from the Battery to the terminal that the Blue/Red wire went to and if the motor doesn't work then it's likely damaged.
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Old 04-26-14, 02:00 PM   #15
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can someone help me with the same issue on an S5?

How does pin out of X-10 connect to D-01 wiper motor plug?
Click the image to open in full size.
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Old 04-26-14, 02:31 PM   #16
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The Black wire in D-01 comes from the emission side of X-10. That is all.
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Old 07-26-15, 10:17 AM   #17
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After hours of searching I finally found this thread. Hope people are still subscribed. My problem is similar to the ones posted above.

I'm not too familiar with rx7's. This is my second one, and it's a work in progress to say the least. The issue I'm having with is getting the wipers to work of course. But I can't figure out if it's a wiring or harness issue because the P/O really hacked this thing up and slapped it back together.

The wiper motor itself works because I've already tested it. Every fuse is good (didn't know which one to check to I checked them all). I tried pulling the plug off and grounding the red/blue wire as suggested and still nothing. I a push in the right direction as to where I should be checking next.

I need the wipers to work asap as it's my daily and it rains heavily sometimes. As a last resort I may just make up a switch to run directly to the motor, as most of the stuff in this car is custom wired anyway. Any help would be appreciated, thanks.
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Old 07-26-15, 11:36 AM   #18
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After hours of searching I finally found this thread. Hope people are still subscribed. My problem is similar to the ones posted above.

I'm not too familiar with rx7's. This is my second one, and it's a work in progress to say the least. The issue I'm having with is getting the wipers to work of course. But I can't figure out if it's a wiring or harness issue because the P/O really hacked this thing up and slapped it back together.

The wiper motor itself works because I've already tested it. Every fuse is good (didn't know which one to check to I checked them all). I tried pulling the plug off and grounding the red/blue wire as suggested and still nothing. I a push in the right direction as to where I should be checking next.

I need the wipers to work asap as it's my daily and it rains heavily sometimes. As a last resort I may just make up a switch to run directly to the motor, as most of the stuff in this car is custom wired anyway. Any help would be appreciated, thanks.
How did you test the wiper motor?

The wiper fuse powers the wipers. More to the point, the wiper fuse powers the Blue wire at the wiper motor w/key to on. Does it power your Blue wire or not as this is something which needs to be known. If it doesn't then w/no key in the ignition check the continuity on the Blue wire from the wiper switch to the wiper motor.
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Old 07-26-15, 05:51 PM   #19
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I ran a wire directly to the wiper motor to see if it was still good. And there is continuity to the blue wires.
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Old 07-27-15, 04:40 PM   #20
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Had a chance to get out and mess with the rx7 a little more. Diag'ing electrical problems has never been my forte so I only know the basics. I confirmed that there is continuity between the wiper switch and the motor when the key is on so I'm assuming there aren't any breaks in the harness. But there is also continuity when the key is off as well. Not sure what that means.

Next I went to double check the fuse box again and there is power to every single fuse except the one I'm assuming is for the wipers. I'm at a loss as where to go next. Should I pull all that wiring out and check for breaks there? Any help would be appreciated.
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Old 07-27-15, 05:58 PM   #21
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Quote:
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Had a chance to get out and mess with the rx7 a little more. Diag'ing electrical problems has never been my forte so I only know the basics. I confirmed that there is continuity between the wiper switch and the motor when the key is on so I'm assuming there aren't any breaks in the harness. But there is also continuity when the key is off as well. Not sure what that means.

Next I went to double check the fuse box again and there is power to every single fuse except the one I'm assuming is for the wipers. I'm at a loss as where to go next. Should I pull all that wiring out and check for breaks there? Any help would be appreciated.
One of the rules to checking for continuity is you do this type of test w/no power to the wire being tested because if it the test is done w/power to the circuit you could do damage. In the future, key to the off position. Thus the test w/key to off was the test to do and since you have continuity that is good. Secondly, you need to focus on if the Blue wire at the motor has voltage on it w/key to on or not as already stated. Do it!
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Old 07-28-15, 01:19 PM   #22
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Just checked and there's no power at the motor or at the fuse box. Would that be a harness issue? The previous owner did a hack job when swapping the engine and putting it all back together. There are a ton of plugs all over that aren't connected to anything and I have no idea where to begin.
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Old 07-28-15, 01:44 PM   #23
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The FSM has a wiring diagram.
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Old 07-28-15, 01:44 PM
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