Hello, please could you help. A friend of mine recently bought this kit to fit into his car, but felt he didn’t have the skill to to assemble it. I assembled the kit for him, following the instructions and noting the polarity of some of the components, making a very neat job of the soldering. I found upon testing, turning the knob to any of the switch positions pulled in the relay and illuminated the ‘led’ permanently. Studying all connections & components again found no problems or errors in assembly. I tested all components with a digital multitester, all okay. I replaced the 555 timer with a spare and tested the board again with the same results as before. Looking at the circuit diagram, and comparing with the board, I have found differences which would not allow this circuit to work as the diagram suggests. The problem seems to be the connections to the 3 pole, multi-position switch (the third pole is not used) and its connected components. On the circuit diagram, the lower pole on the multipostion switch, when position 1 is selected, it links to terminal 7 of the 555 timer, the bottom of R4 & to R3. On the board, position 1 connects to R3, a direct link to position 4 on the switch and to R2. After discovering this, I fail to see how this module could ever work. Please could you advise, whether I have a pcb which has been incorrectly printed or whether the circuit diagram is just incorrect, as no amount of checking of components or soldered joints will make this module work if it has been made wrongly. Kindly awaiting your reply. Richard Stockdale.
There is no problem with the board or components.
There could be a minor difference in the schematic.
Sorry, this forum does not allow picture uploads
If you can provide LINKS (e.g. by using a free online picture base) to HI-RES and SHARP pics of your assembly (both solder- and component side)
then we can take a look and provide some feedback.
Hi, please find the link enclosed to the photos of the fully built wiper kit which dosn’t work, as i explained in the last message. Thanks
s1157.photobucket.com/albums/p58 … G_0076.jpg
Sorry, but this links to family pictures 
Sorry about that, please try this link. Computers aren’t really my subject. s1157.photobucket.com/albums/p58 … G_0076.jpg
Don’t mean to jump into the middle of thisng but it looks like the solder for the connector where the power comes in is a little light and the same thine on a couple of pins of the IC.
You may want to touch it up a bit.