To all replica Lamborghini roadster builders…
I have worked long and hard to cover all aspects of operation for the replica Lamborghini ROADSTER power window and door lock wiring to provide the window “DROP” feature for opening and closing the door AND provide a “one-touch down window travel. The following schematic and explanation should be printed and understood before you attempt the wiring. Read the explanation and follow the circuits.
If anyone has an easier way to accomplish all of these features, or finds a problem with this, please stand up.
RT
This schematic details wiring of the power windows and locks for the replica Lamborghini roadster with a “one-touch down” feature for window operation. This means when you want to open the door window you only have to touch the window switch enough to “latch” the circuit and the window will travel completely down and stop at full down position even when you release the window switch. To stop the down travel at any point in its travel, just touch the window “up” switch.
Roadster wiring for windows is different from the window wiring for the coupe because the roadster needs to have the window “drop” before the door can open. Operating the door handles controls the window “drop”. The inside door handles will unlock the door and drop the window. The outside handles will only drop the window if the door is unlocked. Limit switches control window positions and permits for window drop.
I recommend the builder devise an interlock to prevent the door from unlatching (opening) until the window has reached the bottom of the “drop” travel to prevent interference with the window and roof if the door is opened too quickly. This could be done with an electrical circuit but a mechanical interlock would be more positive.
1. Battery supplies fused 12 VDC to:
Window switches (2)
Relays: 1, 3, 4, 6, 7, 8, 9, 11, 13, and 14.
Door lock switches “J” and “K”
I.S. Door handle switches “N” and “S”
Door open switches “A” and “E”
2. Pressing window switch “Down” sends power to trip relay #3 (#6) which sends power through “Down limit switch at bottom” “R” (“T”), through relay #12 (#10) to window motor and also back through relay #2 (#5) which latches relay #3 (#6) to continue down travel of window. Diode “D 1” (“D 2”) prevents current flow back through window switch. (Note: The Lamborghini window switch terminal changes to a ground terminal after the switch is manually released when the ground terminal for the window switch icon light is connected to ground as shown. The window switch icon light gets power from the car’s dash gauge lighting circuit.)
3. Down limit switch at bottom “R” (“T”) breaks circuit when window is full down, unlatching relay #3 (#6) and stopping power through the window motor and latching circuit. It also prevents sending power to the motor by anyone manually pressing the window switch on purpose or by accident when the window is fully down (open).
4. Pressing window switch “Up” trips relay #2 (#5), breaking the one-touch down circuit and stops window down travel at any position in window travel.
5. Window down motor ground passes through “Up limit switch at top” “X” (“U”) and through relay #1 (#4) to ground.
6. Pressing window switch “Up” sends power to trip relay #1 (#4), which sends power through limit switch “X” (“U”) to window motor.
NOTE: Windows will NOT go up when the door is open. They may only be lowered with the door open. Relay #1 (#4) trigger terminal 85 passes through limit switch “M” (“L”) “Door fully closed switch”. This will prevent the automatic closing of the window in the drop position, or if an attempt is made to close the window with the door open, until the door has been closed. You do NOT want to have the window in the full up position when you close the door. Limit switch “M” (“L”) prevents this.
7. Window up motor ground passes through relay #12 (#10), through “Down limit switch at bottom” “R” (“T”), and through relay #3 (#6). Because relay #2 (#5) has been tripped by the window switch “Up”, the ground current does NOT pass through relay #2 (#5) and does NOT trip relay #3 (#6). Diode “D 4” (“D 3”) prevents window up motor ground from tripping relay #11 (#9).
8. The Unlock switch, or alarm-unlock ground signal, trip relay #7 and sends power to right and left lock drive to mechanically unlock the door latches. That will also mechanically close limit switches “J” and “K” sending power to O.S. door handles “P” and “Y”.
9. The “I. S. door handle switch” “N” (“S”) sends a power signal to right and left lock drives to mechanically unlock both door latches AND power to drop the window for their door only. (You want to have the inside door handle unlock the door if you need to get out. I recommend the handle(s) also have a mechanical connection to unlock the door in case of electrical malfunction.)
10. The unlock mechanical drive trips limit switches “J” and “K” sending power to “O. S. door handle switch” “P” (“Y”). Opening the door by way of the O.S. door handle will signal window drop. (If the door didn’t unlock, the window will not drop and the door will not open. Independent switches for each door will provide a safety measure if one fails. I recommend a mechanical, key operation for the door locks.)
11. When either I.S. or O.S. door handles signal for window “drop”, power is sent to trip relays #11 (#9) and #12 (#10) and through drop limit switch “W” (“V”) which latches the circuit until the window drop travel trips “W” (“V”) breaking the circuit.
12. Relay #12 (#10) having been tripped, prevents the power from going through limit switch “R” (“T”) and relays #2 (#4) and #3 (#5).
13. Diode “D 4” (“D 3”) prevents the ground from window “up” from back feeding the window down circuit. (The grounding circuit is still power searching for ground until it connects with a ground. It is why connecting devices in series cause all of them to run.)
14. When the door is opened the window will drop as described above. If the window has not been lowered beyond the “drop” travel with the door open, when the door is closed the window will go back up. If the window is below the “drop” position, the operator must use the window switch to close the window. There is NO one-touch window up until the window is in the “drop” range of travel (top 2”) where it will travel up by itself.
15. Drop limit switches “V” & “W” are tripped through the top 2” of window travel.
(This limits the drop distance to 2” when doors are in an “unlocked” mode and either inside or outside door handle is operated. If a different “drop” distance is used, be sure the window will clear the roof when the door is opened.)
Drop limit switches “D” & “H” are tripped through the top 2 ¼” of window travel.
(This keeps the circuit available for the “automatic window close” after the door has been opened. If the window has been lowered below that 2 ¼” after the door was opened, the window will not automatically close when the door has been closed. Keep this distance about ¼” longer than the distance set for limit switches “V” & “W”.)
16. When the door is opened limit switch “A” (“E”) connects to power energizing the window close circuit. The window has dropped and limit switch “B” (“F”) is un-tripped making a completed latch circuit for relay #13 (#14) sending continuous power to limit switch “C” (“G”). The drop limit switch “D” (“H”) has not been tripped yet at end of window drop travel and ready to send power to raise window.
17. When the door is closed, limit switch “C” (“G”) is tripped sending current through drop limit switch “D” (“H”) to the window “Up” circuit. Limit switch “A” (“E”) is also tripped, breaking the power connection to relay #13 (#14) trigger. (The relay will stay latched until limit switch “B” (“F”) is tripped at window top of travel.)
