RE: Changing Mirrors
Discussion
victormeldrew said:
I'm considering this mod to my Chimaera (having broken off a mirror trying to remove it for touching up). Its a 96 model, so my query is ... exactly what do you do with relays to make the older mirror ecu work?
The problem IIRC was that the Citroen mirors use one pair of wires to control up/down and the other pair left/right (pluse wires for heater)
The VW has 2 contol wires and 2 more that operate a solenoid which changes the direction of the adjustment (i.e. the solenoid in one state the mirrors go up/down, the solenoid in the other state they go left/right).
If you look up the original thread I seem to remember myself and someone else worked out the wiring and posted the results.
Sadly I sold my chim before doing the mirror mod and sold the mirrors separately. The guy who bought the mirrors opted for a "digital adjusment" method (he prods them with his finger if they need adjusting)
>> Edited by plipton on Monday 5th April 13:49
ok, on www.pistonheads.com/gassing/topic.asp?t=23099 I found this:
PhilipC said:That last line isn't encouraging! I may have to engage some grey matter and think this one through for myself!
I'm assuming you've got:
A - motor ground
B - motor drive (+-)
C - direction ground
D - direction toggle
and need
a - ground
b - motor drive (updown)
c - motor drive (l )
Sounds like the simplest conversion would be:
Connect motor ground (A) to the ground line (a)
Connect the toggle lines (C, D) to a small relay's coil (you'll need to check current drain isn't a problem).
Connect the drive line (B) to the switched line of the relay
Connect the outputs from the relay to the two motor drive lines (b, d)
Parts should be dirt cheap, and the relay probably won't sink more power than the solenoid, but check it first or regret it later!
PS: Might not actually work at all :-)
victormeldrew said:
That last line isn't encouraging! I may have to engage some grey matter and think this one through for myself!
I did exactly that and this is the email I sent Griff2be. In the end I think he solved the problem without a new ECU or relays but the theory works.....
Andy,
PhilipC is nearly right, but I think this solution would be likely to work (main difference is grounding of wires). It's quite long I'm affraid....
Making a few assumptions here (so you will need to check actual wiring);
The Citroen wiring goes like this
Wire 1. + or -12V for up/down I.e.. + and -12V with respect to 0V (Ground)
Wire 2. + or -12V for left/right. + and - as above
Wire 3. Ground
Assuming VW wiring is;
Wire 1. + or -12V for up/down or left/right depending on solenoid
Wire 2. - or + (the opposite of wire 1) 12V whatever that is at any time.
Wire 3. 12V to power solenoid.
Wire 4. Ground.
And also assuming the voltages from the ECU are With Respect to 0V Ground (i.e. +12V WRT Gnd or -12V WRT Gnd)
IF this is correct AND the solenoid returns to base when 12V is removed then;-
On VW mirror, connect;
Wire 1 to wire 1 from mirror ECU
Wire 2 to ground
Wire 3 to switched 12V from relay contact (I'll come to that in a minute)
Wire 4 to ground (with wire 2)
Go to Halfords and buy a cheap 12V changeover relay.
From the car's loom, attach a 12V relay coil +ve to wire 2 (coming from the ECU). The other side of the coil to ground.
Connect the contacts so that a 12V supply from the battery is connected to the solenoid when the relay operates.
Now the theory;
When you move the adjuster switch left and right the mirrors wil move left and right as the voltage applied will be as per the original (as near as possible)
For Up/down, when this is pressed the +ve or -ve voltage WRT Gnd will operate the relay and this in turn will apply 12V to the solenoid. Then the mirror will move up and down.
As I mentioned earlier this is based on a lot of assumptions so may not work.
Let me know how it goes.
Regards,
Rick
Hope this helps
Plipton
but got a Chim in PX 
Discovered how to connect mirror wiring to older cars..
Simply change relay logic so that WN is always connected (to the RG) and for up/down relay also engages N (instead of acting as change over between WN and N)
Then simply connect mirror U & N to harness BR, B to lt green, W to RU (or Slate on the passenger side).
The heater wires connect BR to B and NR to UO.
Works fine for me.
HTH, Dave
Simply change relay logic so that WN is always connected (to the RG) and for up/down relay also engages N (instead of acting as change over between WN and N)
Then simply connect mirror U & N to harness BR, B to lt green, W to RU (or Slate on the passenger side).
The heater wires connect BR to B and NR to UO.
Works fine for me.
HTH, Dave
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