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Old 10-14-2019, 06:12 PM   #11
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So this leads me to believe the computer in the car itself is not working correctly? All signs still point logically to the switch but swapping with known good one rules that out. I guess I can go through the fuse blocks one by one and see if maybe I've got a related fuse somehow blown.
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Old 10-14-2019, 08:17 PM   #12
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So this leads me to believe the computer in the car itself is not working correctly? All signs still point logically to the switch but swapping with known good one rules that out. I guess I can go through the fuse blocks one by one and see if maybe I've got a related fuse somehow blown.
The 'computer' (PCM) in the car is only used to control the engine. The GEM is used to control the wipers, but ONLY when in intermittent and has nothing to do with the PARK circuit. Did you try the first test from my previous post? Do you understand the schematic I posted?

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Old 10-14-2019, 11:22 PM   #13
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So if I press the stalk down and release the wipers immediately stop wherever they are on the glass. If I then push the stalk up to interval mode (with the wipers stopped randomly on the glass), the wipers return to park, and interval wiping commences. If I turn the wipers off during interval mode mid stroke, they stop on the glass. Same goes for turning them off from high or low speed. Which now makes me think they're not parking at all? They just make a complete stroke and return to the bottom of the windshield but can be shut off on the glass mid stroke without shutting off the car. Is this normal?
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Old 10-15-2019, 12:18 AM   #14
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Quote:
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So if I press the stalk down and release the wipers immediately stop wherever they are on the glass. If I then push the stalk up to interval mode (with the wipers stopped randomly on the glass), the wipers return to park, and interval wiping commences. If I turn the wipers off during interval mode mid stroke, they stop on the glass. Same goes for turning them off from high or low speed. Which now makes me think they're not parking at all? They just make a complete stroke and return to the bottom of the windshield but can be shut off on the glass mid stroke without shutting off the car. Is this normal?

OK Im a bit confused and I want to help.
Simple question:
Turn the wipers to ON (low) and then immediately to OFF - do they park, Y/N?

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Old 10-15-2019, 12:39 AM   #15
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No, they will not, even on intermittent, low, or high. If I turn them off mid swipe, they stay wherever they were on the glass. I thought it just affected the single swipe function, but I was wrong. I just didn't notice it in the other modes because they wipe back and forth. Because of this, are you thinking the motor park switch is at fault?
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Old 10-15-2019, 10:33 AM   #16
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Quote:
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No, they will not, even on intermittent, low, or high. If I turn them off mid swipe, they stay wherever they were on the glass. I thought it just affected the single swipe function, but I was wrong. I just didn't notice it in the other modes because they wipe back and forth. Because of this, are you thinking the motor park switch is at fault?
OK now we are getting somewhere :)!

Its either the Wiper Relay, the Park Switch inside the wiper motor (Im assuming the wiper switch on the steering column to NOT be the problem since you have replaced it with the same results), or a issue with the wiring in between. I would start by doing a 'bypass' test on the wiper relay which is relatively simple and costs nothing (you can test the motor by itself later but its a bit of a PITA to get to as you need to remove the wiper arms and the cowl cover). The wiper relay is located in the Central Junction Box (CJB) under the dash on the drivers side (see pic of the CJB in my 2005 ZX4 below). The wiper relay is a small relay in the top row third from left:



The relay has five contacts, two with horizontal blades (top, center), and three with vertical blades in a row at the bottom. The pinout of its connector C2042 in the CJB is posted below (click on the diagram for larger image).

With the ignition switch OFF remove the relay (may need a small pliers, be gentle) and using a piece of wire, paperclip, etc, jumper C2042 pins 3 and 4. This simulates the connection the relay should make with its NC contacts. With the jumper installed turn on the ignition then try the single wipe and see if the wipers park when you release the switch.

Good luck and let me know.

Paul
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Old 10-15-2019, 09:18 PM   #17
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As you can see from the attached Pic, there are no contacts in the fuse block for pin 4 in either of these relays. Can you confirm if your 05 has a contact for pin 4? I looked up behind the fuse panel and there are no cut wires or anything out of place. I guess without this pin, the car is functioning as designed? My buddy has an 02 and it works correctly but not available tonight to look at his fuse panel.

With the relay removed completely, the wipers still work and in the same incorrect way. I tried swapping the two relays with the same results. I checked and the 20amp fuse for the wipers is not blown.
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Old 10-15-2019, 10:26 PM   #18
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Quote:
Originally Posted by Coolzzy View Post
As you can see from the attached Pic, there are no contacts in the fuse block for pin 4 in either of these relays. Can you confirm if your 05 has a contact for pin 4? I looked up behind the fuse panel and there are no cut wires or anything out of place. I guess without this pin, the car is functioning as designed? My buddy has an 02 and it works correctly but not available tonight to look at his fuse panel.

With the relay removed completely, the wipers still work and in the same incorrect way. I tried swapping the two relays with the same results. I checked and the 20amp fuse for the wipers is not blown.
I think you are looking at the wrong relay and its partially my fault . The pic I posted of my 2005 ZX4s CJB doesnt show the wiper relay and I didnt notice that (it shows the bottom row of relays, not the top row). If you look the Ford diagram I posted you will see the wiper relay location in the top row. You can see it in your picture - its the small gray relay whose top edge is hidden by the mounting bracket (dont understand why Ford did this). You will probably need to partially remove the CJB from the bracket to get that relay out. If you look at my pic you will see two small screws. Remove those, squeeze the release clips (below screws) inwards on both sides while pushing the CJB forward and lift the CJB up to disengage it from the bracket. You will be able to move it forward and then GENTLY down to the floor with the harnesses still attached. Then will have access to the wiper relay.

BTW even if you had removed the correct relay (wiper relay) the circuit would still behave exactly as it is now (works but no park). Its the NC (normally closed/non-energized) contacts in the relay that are needed as part of the park circuit. The bypass (jumper) test I want you to try simulates a good set of NC contacts in that relay. Without the relay installed the only other non function (other than no park) is no intermittent wipers as the GEM 'pulses' the relay at timed intervals for each intermittent wipe. This is the only function the GEM has with the wipers.

BTW2 the two relays you removed are the horn relay and the battery saver relay which only need 4 contacts as they are used as SPST relays. The wiper relay needs 5 contacts as its used as a SPDT relay.

EDIT
Added better pics (attached below) of my 2005 ZX4 CJB both installed and partially removed (was adding wiring for heated mirrors and needed access to the back of the CJB) so you can see how it comes out of the bracket. You can see in the second pic you dont need to remove it much to access the (gray) wiper relay.
Paul
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Old 10-17-2019, 11:35 PM   #19
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Thank you thank you thank you Paul1958! I removed the relay, jumpered the sockets and the wipers parked fine. Relay was bad. I swapped it with the power saver relay and confirmed the wipers work just fine now. I had a handful of similiar style relays from my daughter's Sable AC compressor and popped one of them in (see attached pic) and all is well. It didn't appear to have the same diagram on it but it's working. I'll grab a proper match next time I'm at the scrap yard.
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Old 10-18-2019, 07:20 AM   #20
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Quote:
Originally Posted by Coolzzy View Post
Thank you thank you thank you Paul1958! I removed the relay, jumpered the sockets and the wipers parked fine. Relay was bad. I swapped it with the power saver relay and confirmed the wipers work just fine now. I had a handful of similiar style relays from my daughter's Sable AC compressor and popped one of them in (see attached pic) and all is well. It didn't appear to have the same diagram on it but it's working. I'll grab a proper match next time I'm at the scrap yard.


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