Civinfo - View Single Post - [How-To] switch power mirrors with the central locking

hgt · 28th February 2008, 13:32

Yes, the manual switch takes control of the relay and switches the polarity to the motors, thus giveing you manual control over the mirrors.
But when you bring the mirrors in manualy the manual switch shorts the base of TR2 to ground this switches TR2 off, the relay drops out and the mirrors come in.
Because the base of TR2 is now shorted to ground any input from the central locking via TR1 has no effect, until you press the manual switch again.
The central locking input now takes control via TR1, the base of TR2 goes high, TR2 now conducts and the relay comes in, changes the polarity to the motors and the mirrors extend.
This is probably as clear as mud, but its the best I can give for an explanation
hope it helps.

28th February 2008, 13:32	#91 (permalink)
hgt Supporter Wheelnut Join Date: 11th October 2007 Location: Holmes Chapel, Cheshire Posts: 69 Thanks: 0 Thanked 0 Times in 0 Posts iTrader: (0)	Yes, the manual switch takes control of the relay and switches the polarity to the motors, thus giveing you manual control over the mirrors. But when you bring the mirrors in manualy the manual switch shorts the base of TR2 to ground this switches TR2 off, the relay drops out and the mirrors come in. Because the base of TR2 is now shorted to ground any input from the central locking via TR1 has no effect, until you press the manual switch again. The central locking input now takes control via TR1, the base of TR2 goes high, TR2 now conducts and the relay comes in, changes the polarity to the motors and the mirrors extend. This is probably as clear as mud, but its the best I can give for an explanation hope it helps.