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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 04-26-14, 02:31 PM
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