| Author | Message | ||
     Graham Burn Experienced User Username: graham Post Number: 25 Registered: 6-2013 |
When my wipers are on intermittent they pause very high on the screen between sweeps. I had the arms off recently to clean and lube the spindles as per Paul Yorke hint to which they responded very well now nice and smooth and quiet. Looking at the wiring diagram for the wipers there does seem to be 2 limit switches which control the intermittent parking and final parking positions but I can't find any mention anywhere which explains how to adjust them. The final parking position seems to be correct as when they start they just go straight up the screen and park about 1 inch away from the scuttle panel at the base of the screen, I'd just like them to pause lower on the screen between sweeps, at the moment they pause right in my line of sight which is really annoying. Any suggestions anybody? Thanks Graham | ||
| Ernest Carty Experienced User Username: edcarty Post Number: 29 Registered: 12-2012 |
It sounds like the intermittent wiper control module is acting up but do not despair as I had this same problem on my silver spirit some time ago and remived it by disconnecting the unit ,cleaning all the terminals and also checking and cleaning the earth point situated next to the Front drivers door when reassembled the unit it worked perfectly.You do not say what car you have but take a look at IETIS for more detailed info.Hope this helps .Regards Ernie. | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 2962 Registered: 4-2003 |
Nothing wrong with your intermittent ECU. Question: when pausing on intermittent, do the wipers go low and then up the screen a bit before pausing? Otherwise, do they stop too high but continue lower after pausing ? If either case is so, then the drive arm at the wiper motor shaft has been rotated and may be corrected very easily. BTW the off-screen limit switch is on the bulkhead,and yours sounds correctly adjusted. It is adjusted by moving the tab on the moving mechanism. The other is located inside the wiper motor and is actually a finger contact touching a PCB conductive disc. The dwell of the intermittent stop is not adjustable. RT. | ||
| Ernest Carty Experienced User Username: edcarty Post Number: 31 Registered: 12-2012 |
Richard if the Drive arm at the drive shaft then the Wipers would park in the wrong position all the time irrespective of using either normal or intermittent wiper control also dependent upon year of car some Wiper motors no longer use the switch inside the motor housing ,if you look at IETIS Electrical section it can be clearly seen from the wiring modification when this was deleted.Hope this helps. | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 2964 Registered: 4-2003 |
Not exactly correct, so my questions remain unanswered. Warning. Use IETIS as a guide only, IETIS being prepared by a Company around 3000km East from Crewe and from hand sketches with annotation in a different language from its source. Here is the park limit switch located on the firewall. It acts independently from any misalignment of the wiper shaft. RT.  | ||
| Ernest Carty Experienced User Username: edcarty Post Number: 32 Registered: 12-2012 |
Not if you get the OFFICIAL VERSION from CREWE as I did,the park limit switch is controlled by the travel of the link which is directly linked to the wiper blade fixings,therefore if the link is out of sequence then so will be everything else .In the Intermittent wipe control ECU is a seperate timing mechanism,some ECUs use timing capacitors others use a microchip circuit and others have used a Zener Diode with duel changeover relay .Hopes this clarifies things . | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 2965 Registered: 4-2003 |
The picture above shows the limit switch at the bulkhead which indeed is the one controlled by the link to the blade. The picture below shows the drive arm at the motor. If it has been set a few splines out, then intermittent parking may be incorrect, hence the questions. Regardless of the setting of the shaft and lever splines, the final parking position is set by the limit switch on the firewall. To park off-screen, all these systems use the classic R-R method of reversing the wiper motor direction to pop the parking cam seen below. The ECU does no more than give a voltage pulse for ½ second at the interval selected on the intermittent switch. The pause position is controlled by the finger contact inside the wiper motor. Although there are three wiper motor part numbers for SZ cars, the CD6695 motor applied from 1988 onwards is no different from the earlier ones in this regard and is a direct retrofit item for earlier cars in any case. R,.  | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1136 Registered: 6-2006 |
Just to try and clarify what Richard was saying. There are two separate park switches, one on the bulk head . . . Off parking position Another in the motor , , pause stop position. On intermittent the car has no idea where the wipers are, only where the motor is. So putting the linkage on the motor wrongly will not affect anything but the pause position. There are a few ways of setting them. Try. . . Put the wipers on intermittent. When they pause turn off the battery. Undo the wiper spindle and then set the arms to the pause position. Off park position should remain the same. Good luck  | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 2967 Registered: 4-2003 |
Thanks for the clarification, Paul. Agreed. My point here is that the pause should be when the blade is at the lower end of its stroke. When the blade restarts its movement after a pause it should go up the screen immediately. If the blade stops high then continues to go lower after the pause, then the shaft splines at the wiper motor are out of position. Likewise if the blade goes low then comes up a bit before pausing. If the wiper motor has been removed for any reason that can happen. It is very easily corrected in a minute by loosening the nut shown in the picture above and repositioning the splines before retightening. As Paul confirms, the off-screen parking position is completely independent by virtue of the limit switch on the firewall. RT. | ||
| Graham Burn Experienced User Username: graham Post Number: 26 Registered: 6-2013 |
Sorry for not mentioning it but my car is a 1987 Turbo R red label, thanks for the replies guys, now I've got something to go with, I'll let you know how I get on. Thanks Graham | ||
| Graham Burn Experienced User Username: graham Post Number: 27 Registered: 6-2013 |
Just read the replies again and need a little clarification before I get the spanners out, I understand I have to reposition the linkage on the motor spindle but where should the wipers pause when on intermittent, the same position as the normal park? Thanks again Graham | ||
| Brian Vogel Grand Master Username: guyslp Post Number: 693 Registered: 6-2009 |
Graham, This applies not only to my Rolls-Royce cars, but every car I own with intermittent wipers: The "wiper pause placement" on the intermittent setting is well higher than the park placement. When parked the wipers are about as low on the windshield as they can possibly get while still being there. When paused between wipes they're several inches higher than the park position, but still below your main field of view when looking out of the car. Brian | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1137 Registered: 6-2006 |
Graham, at a guess - about 3" Because of the reverse cam, they should not be able to go any lower. The linkage rod and the linkage on the motor should be a straight line. | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 2968 Registered: 4-2003 |
As Paul states, in a straight line with the lever to the bulkhead is optimal. In other words, when paused, the reverse cam assembly is positioned at far end away from the bulkhead as and inline as shown below. This is a 1993 Continental R but the mechanism is the same as on the 1987 Turbo R. RT.  | ||
| Ernest Carty Experienced User Username: edcarty Post Number: 33 Registered: 12-2012 |
PLEASE SEE MY earlier post re Continental R modification and also Brian Vogul is absolutley correct | ||
| Graham Burn Experienced User Username: graham Post Number: 28 Registered: 6-2013 |
Hi All, many thanks for the clarification, just have to get wrapped up against the elements and have a go at resetting the linkages as instructed. Thanks again and best wishes to you all for Christmas and the New Year. Graham | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1138 Registered: 6-2006 |
Hope this helps Graham.   Ernest - you said "Richard if the Drive arm at the drive shaft then the Wipers would park in the wrong position all the time irrespective of using either normal or intermittent wiper control also dependent upon year of car some Wiper motors no longer use the switch inside the motor housing ,if you look at IETIS Electrical section it can be clearly seen from the wiring modification when this was deleted.Hope this helps." The bulk head switch is operating after the motor and the reverse cam, It can only operate when the wipers are in one position - lowest point. How does it decide on the intermittent park position? | ||
| Ernest Carty Experienced User Username: edcarty Post Number: 34 Registered: 12-2012 |
DUE TO THE MODIFICATION I MENTIONED THE INNER SWITCH WAS OMMITTED ON CERTAIN WIPER MOTORS AND CAR MODELS ,THE WIRING WAS MODIFIED TO USE THE BULKHEAD SWITCH FOR NORMAL OPERATION AND A MODIFIED INTERMITTENT TIMER AND WIRING.RICHARD DID SAY THAT IETIS WAS WRITTEN 3000 KMS AWAY OBVIOUSLY THIS ONE IT NOT THE ONE WE USED AT CREWE,ALSO WHEN I SAID THE DRIVE ARM AT THE DRIVE SHAFT I MEAN THE OUTPUT SHAFT OF THE MOTOR AND YOU HAVE JUST EMPHASISED THIS FACT BY SAYING THAT THE MOTOR AND BULKHEAD SWITCH. | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1139 Registered: 6-2006 |
Ernest, If there is no switch in the motor, how does it decide where the on screen intermittent park position should be? Are you saying that the timer unit is doing the on screen park position? If not, what are you saying decides the on screen park position? | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1140 Registered: 6-2006 |
What Richard was saying was that Ietis was not written in Crewe. Intermittent operation (Key to 16-27) Circuit description There are four selected switch positions for intermittent operation of the windscreen wipers. Intermittent operation of the wipers gives one complete wipe at pre-set intervals of approximately 4, 7, 14, or 21 seconds. The time intervals increase as the switch is rotated anti-clockwise. Whenever the windscreen wipers switch is set to an INTER (intermittent) position, the red and orange cables are interconnected at the wipers switch (see item 39a). Also, when the wipers switch is in an intermittent position, a 12 volts positive supply from fuse B7 at fuseboard F2 is directed through the wipers switch (see item 39b) to the 'On screen' park switch. In addition, dependent upon the intermittent position selected, the slate and black cables are interconnected via a series of resistors as shown in the adjacent illustration. Whenever the red and orange cables are interconnected, the windscreen wipers electronic control unit provides a 12 volts positive supply on the light green/white cable to energize relay 1. With this relay energized, a 12 volts positive supply is directed through the normally open contacts of the relay, and via the normally closed contacts of relay 3, to the slow speed brush of the wiper motor. The earth path for the wiper motor is directed through the normally closed contacts of relay 2 to the valance earth point. The motor then rotates. After one wipe cycle, the motor sets the 'On screen' park switch to the park position. A 12 volts positive supply is then fed via the park switch to the windscreen wipers electronic control unit. In response to this input, the electronic control unit switches off the 12 volts positive supply to the coil of relay 1 causing the motor to stop immediately (the windscreen wiper blades being in the 'On screen' park position). After the appropriate time delay, the windscreen wipers electronic control unit again provides a 12 volts positive supply on the light green/white cable causing the cycle to be repeated. | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 2969 Registered: 4-2003 |
A bit tiring especially text in upper case. IETIS that we all have is prepared in Poland. | ||
| Graham Burn Experienced User Username: graham Post Number: 29 Registered: 6-2013 |
Hi Paul, your explanation seems to make sense looking at the wiring diagram I have which was downloaded from the Oz site, unfortunately the pages are a bit mixed up and the key for the diagram is missing so it's a bit of a minefield. ATB Graham | ||
| Ernest Carty Experienced User Username: edcarty Post Number: 35 Registered: 12-2012 |
Congratulations to Paul you have got in1 | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1141 Registered: 6-2006 |
Eye roll . . . . which luckily is the opposite of what you said Ernest. Graham, I wouldn't worry about the wiring diagram and any other instruction other than the mechanical position of the Wiper spindle to linkage alignment. (That is assuming that the only things you touched were that and the spindles. If you took the motor apart you may have misaligned something but I sincerely doubt it.) In park and on screen park, I'm pretty sure you'll be fine if you adjust it as per the photo. The rest is just a red herring.  | ||
| Graham Burn Experienced User Username: graham Post Number: 32 Registered: 6-2013 |
Thanks Paul, I was only looking at the wiring diagram to see if there were indeed 2 independent switches which I found but in the absence of a key it was a bit difficult to fathom out how the system actually worked if it stops raining I'll have a look at it. Graham | ||
| Graham Burn Experienced User Username: graham Post Number: 40 Registered: 6-2013 |
Hi Guys, especially Paul, finally stopped raining long enough to isolate my earth fault and sort the wipers out, repositioning the arm on the motor sorted the problem, just a case of switching the wipers on intermittent then switching off the ignition when they paused, loosened the nut on the motor spindle setting the linkage in a straight line and tightening up as in the pictures posted. All working perfectly now. Thanks all round Graham |
