My search and post in the Superduty forum yielded no results so I thought I'd give the 6.0 forum a try. My wipers only work on fast speed, not on slow or intermittant. Windshield washer doesn't work either. Turn signals and high/low beams work fine. I replaced the wiper/high beam switch on the steering column but no change. I keep hearing about a GEM module. What is it and where is it located? Could this be my problem?

 

When you turn the switch "off" do the wipers stop where they are or do they "park"?

 

When I turn the wipers off they stay where they are. They don't PARK where they are supposed to. Does this give you an idea of the problem?

 

Yep..you need a new wiper motor!

(where is Schwenksville ?)

 

Does the wiper motor affect the washer? Schwenksville is an hour NW of Philadelphia. Thanks for the advice.

 

There is a module in the wiper motor that controls the washer pump as well.

(assuming it is full of fluid)

 

Sounds a little expensive.

 

The switch was $100 and the motor will be about $140.

 

But.............. did it fix your problem?

 

Switch didn't fix the problem. Dealer has motor on order, will pick it up tomorrow morning and report back.

 

Replaced wiper switch on column and wiper motor and still only have high speed wipers, no washer and wipers don't park. Something is controlling the wipers between the switch and motor. The guy at the Ford parts counter said there is no GEM on my truck. I'm baffled!

 

Principles of Operation
The wiper motors receive inputs from the following:

• multi-function switch
• ABS control module vehicle speed signal (VSS)
• ignition switch
• power distribution junction box (PDJB)

The following components are integrated in the wiper motors:

• windshield wiper motor module
• High/Low speed relay
• run/park sense (Hall effect)
• washer pump relay

High-Speed Windshield Wipers
When the multi-function switch is set to the HIGH-speed position, it supplies ground to the high/low-speed relay coil and the run/park relay coil, which causes the windshield wiper motor to operate at high speed. During HIGH-speed operation only, both the high/low-speed relay coil ground and the run/park relay coil ground are controlled directly by the multi-function switch. This differs from LOW-speed or INTERMITTENT operation when the run/park relay coil is controlled by the microprocessor. When the switch is placed in the OFF position, the motor continues to operate until the motor returns to the PARK position and the internal Hall-effect sensor senses the motor magnet. The output to the run/park relay deactivates the relay and disconnects the voltage to the motor.
Since the high/low relay coil and the run/park relay coil are both controlled by a hard-wired circuit to the multi-function switch, the windshield wipers will still operate in high-speed mode if the internal windshield wiper module fails, but will not automatically park when the multi-function switch is turned to the OFF position.
Low-Speed Windshield Wipers
When the multi-function switch is set to the LOW-speed position, it supplies ground to the internal windshield wiper motor module low-speed input and the windshield wiper motor operates at low speed. During LOW-speed operation, the internal run/park relay is activated by the microprocessor and supplies 12 volts to the low-speed brush of the windshield wiper motor. The run/park relay coil ground is controlled by the internal windshield wiper motor module based on inputs received from the multi-function switch. When the switch is placed in the OFF position, the motor continues to operate until the motor returns to the PARK position and the internal Hall-effect sensor senses the motor magnet. The output to the run/park relay deactivates the relay and disconnects the voltage to the motor.
Since the run/park relay is controlled by the internal windshield wiper motor microprocessor, the wipers will only operate in high-speed mode if the internal windshield wiper motor module fails, and will not automatically park when the multi-function switch is turned to the OFF position. This is due to the run/park and high/low relay coils being directly hard-wired to the switch in high speed. The diode prevents current flow through the high/low relay coil so the relay remains in the normally closed LOW-speed position.
Intermittent-Speed Windshield Wipers
When the multi-function switch is set to the INTERMITTENT position(s), it supplies ground to the windshield wiper motor module inputs and the windshield wiper motor operates in intermittent mode. During INTERMITTENT operation, the windshield wiper motor activates the run/park relay coil which sends voltage through the high/low relay. The high/low relay remains deactivated, supplying the voltage to the low-speed brush of the windshield wiper motor. The windshield motor continues to operate until the internal Hall-effect sensor senses the magnet (PARK position) and deactivates the run/park relay, which disconnects voltage from the wiper motor. The windshield wipers remain parked until the windshield wiper motor module completes a time-out and then repeats the intermittent windshield wiper cycle.

 

Just for S&G,pull fuse #33 from the CJB (under the hood).
Verify it is good.

 

Thanks Vloney. According to your info, the wiper motors receive inputs from the following:

• multi-function switch
• ABS control module vehicle speed signal (VSS)
• ignition switch
• power distribution junction box (PDJB)

So, if the switch and motor are new, the fuses are good and the ignition power is good, the likely suspect is the VSS. Is this the module on the firewall behind the radio? If i'm not mistaken a replacement module would need to be programmed by the dealer, correct?

 

I'm hoping you mean the fuse panel under the dash, not the hood. Fuse 33 looks good, just in case I swapped it with another 15 amp and no change.