Still a problem with the wipers......
Discussion
This week a got a second wiper ecu, but is made no difference. There are a couple of problems.....
The wipers struggle to wipe on their way back. If we bypass the 12V feed, directly from the battery, the wiper motor wipes great.It seems to be a current problem.
Other problem is the washer function. If I push the button on the steering wheel, the wipers start to wipe nut the washer pump doesn't funtion. It doesn't matter if I use the old or the newer (used)one. There are 2 blue/yellow wires on the wiper ecu. They are from the washer. On 1 of them there is a constant 12V. This seems strange to me. The other one keeps showing nothing.
Could this also have someting to do with the steering column ecu?
Does this sound familiar to anyone?
Where is the steering column ecu situated?
The wipers struggle to wipe on their way back. If we bypass the 12V feed, directly from the battery, the wiper motor wipes great.It seems to be a current problem.
Other problem is the washer function. If I push the button on the steering wheel, the wipers start to wipe nut the washer pump doesn't funtion. It doesn't matter if I use the old or the newer (used)one. There are 2 blue/yellow wires on the wiper ecu. They are from the washer. On 1 of them there is a constant 12V. This seems strange to me. The other one keeps showing nothing.
Could this also have someting to do with the steering column ecu?
Does this sound familiar to anyone?
Where is the steering column ecu situated?
Wiper speeds are controlled by the dash control unit, that switches the relays in the wiper ECU.
I had weak wiper and it was the wiring from the fuse board to the wiper ECU. Replace with a fused direct feed from the battery and the speeds still controlled the original way and the wiper are the strongest they have ever been.
I had weak wiper and it was the wiring from the fuse board to the wiper ECU. Replace with a fused direct feed from the battery and the speeds still controlled the original way and the wiper are the strongest they have ever been.
Does anyone have a drawing/scheme from the steering control ECU?
When we measure current on the wiper ECU (on the input washer; blue/yellow wire), there is a constant 12V. We think this is strange, because our thought is that there should be 12V when you push the washer button and that the ECU connects to the out going washer wire. There is a constant 12V. There is, therefore, also a constant 12V on the out going washer pin on the steering ECU.
The wipers seem to function ok after we disconnected the connector behind the helmet holder that comes from the fusebox. But sometimes it falls back and is too weak again. It doesn't give confidence......
When we measure current on the wiper ECU (on the input washer; blue/yellow wire), there is a constant 12V. We think this is strange, because our thought is that there should be 12V when you push the washer button and that the ECU connects to the out going washer wire. There is a constant 12V. There is, therefore, also a constant 12V on the out going washer pin on the steering ECU.
The wipers seem to function ok after we disconnected the connector behind the helmet holder that comes from the fusebox. But sometimes it falls back and is too weak again. It doesn't give confidence......
flyingdutchie said:
Does anyone have a drawing/scheme from the steering control ECU?
When we measure current on the wiper ECU (on the input washer; blue/yellow wire), there is a constant 12V. We think this is strange, because our thought is that there should be 12V when you push the washer button and that the ECU connects to the out going washer wire. There is a constant 12V. There is, therefore, also a constant 12V on the out going washer pin on the steering ECU.
The wipers seem to function ok after we disconnected the connector behind the helmet holder that comes from the fusebox. But sometimes it falls back and is too weak again. It doesn't give confidence......
The 12v to the wiper ECU is the power feed, the signals to control the wiper ECU and where to switch that 12v come from the steering ECU.When we measure current on the wiper ECU (on the input washer; blue/yellow wire), there is a constant 12V. We think this is strange, because our thought is that there should be 12V when you push the washer button and that the ECU connects to the out going washer wire. There is a constant 12V. There is, therefore, also a constant 12V on the out going washer pin on the steering ECU.
The wipers seem to function ok after we disconnected the connector behind the helmet holder that comes from the fusebox. But sometimes it falls back and is too weak again. It doesn't give confidence......
On mine there was a problem in the feed from the fuse at the back to the wiper ECU so that resistance built up due to age in the wire, it delivered 12v but no current so the wipers were weak and stalled all the time and after a while would stop altogether.
Fed a fused feed to the 12v input on the ECU and now all is well.
Because of your wiper problem, we started at the back. Where the wiring comes from the fusebox. We disconnected the connector. Tried to get the green wire out without disconnecting the whole connector and wires. We didn't get the green wire out and decided to connect the connector again. We then noticed that the wipers funtioned very good. But it doesn't function every the time. A coulple of times it fell back in performance again. But the wiper situation bettered. Maybe we go the same route yo did. But then we still have 2 problems:
1. washer function
2. i only have the interval speed and a first speed. There also should be a second (or third) speed
I bought a second, used, wiper ecu. It doesn't make a difference. The wipe/wash button only functions for the wipers. It should steer wipers and washer when the button is pushed. So, we want to find out how it functions and where the malfunction is. I do not want to buy all another ecu again when the current one is ok.
It would be great when someone could tell me what to measure and how the functions work.
1. washer function
2. i only have the interval speed and a first speed. There also should be a second (or third) speed
I bought a second, used, wiper ecu. It doesn't make a difference. The wipe/wash button only functions for the wipers. It should steer wipers and washer when the button is pushed. So, we want to find out how it functions and where the malfunction is. I do not want to buy all another ecu again when the current one is ok.
It would be great when someone could tell me what to measure and how the functions work.
flyingdutchie said:
i only have the interval speed and a first speed. There also should be a second (or third) speed
I bought a second, used, wiper ecu. It doesn't make a difference. The wipe/wash button only functions for the wipers.
Losing one of the speeds could be due to the corresponding motor brush not working. I bought a second, used, wiper ecu. It doesn't make a difference. The wipe/wash button only functions for the wipers.
Check the red/green wire at pin 3 of J29, the 5 pin wiper motor connector (which again goes to the yellow motor wire). If this wire is powered when 2nd speed is engaged, I would suspect this. If it is the case, it is often easily fixable.
Also, from looking at the wiring, I suspect the "logic" of the wipe/wash function lies in the steering wheel control, not the wiper control (which I suspect is rather dumb). Talking of which, also check the wiper 2nd speed control signal out of the steering wheel control, also red/green, pin A6.
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