Mirror Switch wiring help needed
08-23-2009, 06:54 PM
#1
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Mirror Switch wiring help needed
Gents,
My mirror switch in the door (the 4 way one) committed suicide recently, so I bought a new one. When I opened up the door panel, I found a mess of wires that the PO had thoughtfully left me. This switch has 6 prongs on the back side for wire connections. Something along these lines...
_ _
[ ]
_ _
Anyone know how this is wired? Or even where power and ground go? There seems to be a wire that bridges off the mirror select switch. I checked the wiring diagram, but I can't figure it out.
I imagine there was probably a plug at one time, but someone thoughtfully removed it for me so I'd have something to do in my spare time.
Thanks,
Brian
79 Euro
My mirror switch in the door (the 4 way one) committed suicide recently, so I bought a new one. When I opened up the door panel, I found a mess of wires that the PO had thoughtfully left me. This switch has 6 prongs on the back side for wire connections. Something along these lines...
_ _
[ ]
_ _
Anyone know how this is wired? Or even where power and ground go? There seems to be a wire that bridges off the mirror select switch. I checked the wiring diagram, but I can't figure it out.
I imagine there was probably a plug at one time, but someone thoughtfully removed it for me so I'd have something to do in my spare time.
Thanks,
Brian
79 Euro
Last edited by Brian B; 08-23-2009 at 06:55 PM. Reason: I can't draw well
08-23-2009, 08:56 PM
#2
Nordschleife Master
Check this for a wiring diagram:
http://www.cannell.co.uk/Manuals.htm
The coding for wire colors to pins will be in there but may not be clear.
http://www.cannell.co.uk/Manuals.htm
The coding for wire colors to pins will be in there but may not be clear.
08-23-2009, 09:50 PM
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Thanks, Glenn.
I have the workshop manuals here at my desk, but I can't figure out where the hot and ground wires attach to the switch. I have a violet wire that is my power lead and then I have 2 brown wires, a blue and white wire that runs to the selector switch and a black wire.
I'm assuming that one has to be a ground and the rest control the input to the servo motors for the mirrors, but I'm not sure where they attach. Once I get the power and ground sorted out. I can experiment to figure out movement.
I have the workshop manuals here at my desk, but I can't figure out where the hot and ground wires attach to the switch. I have a violet wire that is my power lead and then I have 2 brown wires, a blue and white wire that runs to the selector switch and a black wire.
I'm assuming that one has to be a ground and the rest control the input to the servo motors for the mirrors, but I'm not sure where they attach. Once I get the power and ground sorted out. I can experiment to figure out movement.
08-23-2009, 10:56 PM
#5
Nordschleife Master
I guess you've got to work it out. They don't number the pins in the diagram. Maybe check some other years. The '79 diagram that's on-line only shows the left mirror, too.
Looking at the diagram this may be hard. Ya gotta use a voltmeter (Ohmmeter, really) to figure out which pin is which.
Looking at the diagram this may be hard. Ya gotta use a voltmeter (Ohmmeter, really) to figure out which pin is which.
08-23-2009, 11:03 PM
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Well if you got the violet figured out, and you know that brown is ALWAYS the ground on a 928, you just gotta figure out where the blue and white and the black plug in. This from a electrical electronics moron. Me!
08-23-2009, 11:07 PM
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One more insight for you. Be careful how you lay the wires out inside the door panel. As I found out ( twice unfortunately), the window raising and lowering will rip the wires apart for you.
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08-23-2009, 11:30 PM
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What is making me crazy is that's its not even intuitive. The switch has 4 prongs forming a box in the middle with a prong on either end. My initial thought was that the power and ground would go on either end with the servo controls forming the box in the middle, but I don't want to hook it up wrong and short it out.
Its amazing how these silly little problems can be such a huge pain in the butt.
Its amazing how these silly little problems can be such a huge pain in the butt.
08-23-2009, 11:34 PM
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All we need is one picture from someone that has the door panel off! Just a note: my mirrors on my '88don't work either but I haven't yet gotten around to finding out why. I'm reasonably sure it has something to do with the installation by the PO of the UNGO box(es) all connected to apparently everything under the dash.
08-24-2009, 01:15 AM
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08-24-2009, 08:44 AM
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Well, I have a 79 too, and my wires are different in color than those in the pics, and different in color than those you discribed...
I never managed to plug them back correctly.
My current solution is to forget about power mirrors and adjust them by hands.
I never managed to plug them back correctly.
My current solution is to forget about power mirrors and adjust them by hands.
08-24-2009, 11:12 AM
#14
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It should not be that hard. Do you have just one mirror on drivers side or 2?
If you have 2 your changeover switch should only have 3 pins as in the picture above.
You will need to be systematic in testing the switch (I revised the below a little to fix an ambiguity - its like a logic puzzle - but yoiu need to know how the mirror switch and mirror solenoid works).
Some basics - Brown wires are always ground (you should have 2 that connect to the switch) they connect to the only 2 terminals on the switch that are always connected together (test with DMM).
Your Power wire: Black/Violet (or maybe Violet) goes to one of the 2 connections that never connect to the ground pins (so test all the switch posistions for each pin wrt ground to narrow this down).
The remaining 2 connections are for the Blue & Black wires - try one orientation and if the mirror direction is backwards swap them.
Back to power the blue & black wire pins should connect to ground in one direction L or R and power in the other, they should also connect to ground in one direction U or D and power in the other. This will be correct for only one of the possible power pins.
The remaining pin will connect to power in either direction in just one plane. So it either connects in both L & R or in both U & D. That pin is where the white wire connects.
Alan
If you have 2 your changeover switch should only have 3 pins as in the picture above.
You will need to be systematic in testing the switch (I revised the below a little to fix an ambiguity - its like a logic puzzle - but yoiu need to know how the mirror switch and mirror solenoid works).
Some basics - Brown wires are always ground (you should have 2 that connect to the switch) they connect to the only 2 terminals on the switch that are always connected together (test with DMM).
Your Power wire: Black/Violet (or maybe Violet) goes to one of the 2 connections that never connect to the ground pins (so test all the switch posistions for each pin wrt ground to narrow this down).
The remaining 2 connections are for the Blue & Black wires - try one orientation and if the mirror direction is backwards swap them.
Back to power the blue & black wire pins should connect to ground in one direction L or R and power in the other, they should also connect to ground in one direction U or D and power in the other. This will be correct for only one of the possible power pins.
The remaining pin will connect to power in either direction in just one plane. So it either connects in both L & R or in both U & D. That pin is where the white wire connects.
Alan
Last edited by Alan; 08-24-2009 at 12:19 PM.
