Hello. There has recently been a problem with the rear window wiper not always working. After switching on, the wiper can work e.g. 5x and then stops, it suddenly works again, etc. It just works as it pleases. My observations and initial diagnostics: - after switching on the ignition on the pin 1 (in the photo) appears + 12V not dependent on the position of the wiper handle, - on pin 4 there is a transition to the body weight, - when the wiper is working properly, pin 3 appears by + 12V pulse and pin 2 is constant voltage + 12V until the wiper makes a full movement, then again impulse appears on pin 3 and the cycle repeats (i.e. at that moment everything OK), - when the wiper does not work (and should) on pin 1 is +12, but on pins 3 and 2 there is no voltage, - after shorting pins 1-2 or 1-3, the wiper works every time, i.e. the engine is rather fine, - when the wiper does not walk, even switching on the front wipers + reverse does not help, so the handle is rather good, - each time you turn the rear wiper switch, you hear a relay under the steering wheel (even when the wiper is not working).
To sum up, the problem is the lack of impulse on pin 3 which allows the wiper to work. I tried to move the plugs in the tailgate, I moved the bundles, but it has no effect. What else can I check? Can it be fixed somehow?
Is this a replaceable part? Is it built into some module? I read somewhere about bypassing this relay and giving a plus by another 12V relay. It's a bit of a joke, but a new car is no longer an annoying problem.
I've already had 2 such cases and 90% of the motor zero point will be damaged and the relay will switch on because it gets a signal from the motor
Dude, can you suggest something more? Zero point, i.e. some contactor / limit switch? How did you deal with it?
I noticed that if I hit the fuse box several times with my hand, the wiper can start suddenly but it doesn't work with breaks, it only does 10 full ranges and only pauses. I disassembled the UCH module and there are several relays on it, I tried to assess by touch which one is responsible for the wipers but it's hard to feel. Can anyone suggest which element is the rear window wiper relay?
Yes I know about it. It's not always the engine that gets the boost The relay itself is "ticking" and the impulse is missing. When I give an impulse from outside, the engine starts immediately. I was so intrigued by the answer about the zero position of the engine, maybe in the middle of the mechanism there is an element that gives the signal that the wiper has made the full range of motion?
Hello all. I had the same problem as the others with the rear wiper in the scenic 1 ph2, once it worked once, sometimes it stopped as I saw it, until I finally decided to do it. I will describe how the repair looked for me, maybe it would help someone. I removed the ear on the left side of the steering wheel in the middle there is a relay the third in turn and the last with the description p1cno10n I decided to remove it so as not to desolder it from the board I only broke it on the board and soldered the cables to the plates that remained and I made an external finder relay 8a on the stand, because I didn't have the original one and now if it gets damaged, I replace it within a minute. the wipers returned to normal operation after the entire procedure. For those interested I can insert photos from the procedure. I did not desolder the relay but I broke it and soldered the cables to the contacts that were not to interfere with the original February because probably some of these solders were double-sided and I did not want to kick something. best regards.
Good day. Quite a lot of time has passed, but maybe it will succeed. I can ask you for this pattern. I have the same problem. The relay cannot be heard, Motor, cables checked. Shifter also. I am asking you for this diagram and catalog number of this relay.