348 Spider - Window - Mystery Box

I have a 1993 348 Spider with some very odd window wiring. This all started because the drivers window does not work. No response from the switch at all.

There is a mysterious box just above the accelerator pedal that the wiring for the windows as well as the wiring for the door locks seems to run through. All fuses for the windows are good (namely 2 and 23 in the pass kick panel) The passenger side window works, and when the switch is pressed, the mysterious box clicks like a relay. This box has about 20 wires going into it. The connector is similar to those connecting the sliding seat belt track modules. The seat track modules have been removed in this car (355 seats installed).

More mystery....
The passenger side window connector only has 3 wires populated (normally there are 5) the two that are missing are the ground wires. All wires are small gauge and run back to the mysterious box. Obviously this as all totally different than the wiring diagram. In the wiring diagram the window motor actuation is controlled by the window switch, here the window switch is just that a switch that tells the mysterious box where to send power.

Now the drivers side door is wired like the wiring diagram indicates.. the window switch connectors are populated with the correct 5 wires and the colors are consistence with another 348 ts we have here (with no mystery box). Oddly, the window switch power in wire (pin 3 in center) is shorted to ground, but only when the mystery box is plugged in. Unplug the mystery box and nothing works.

More mystery:
So Relay G in the kick panel is meant to send power to the window switches. In this car this relay has been replaced by a plastic relay jumper. Power then goes through both fuse 2 and fuse 23 and then on to the mystery box. If you pull fuse 23 the passanger window stops working.

Any help would be appreciated. This car was actually in a frontal crash and the condition of many thing are suspect.

Is this Mystery Box from another car?

Is it some wort of window ECU that was included in late model 348s? Is it from a 355?

Is there a wiring diagram anyone has seen that describes the passenger window wiring phenomenon I describe above?

 

Yes I have traced all the wiring back and forth through the door jabs on both doors. The circular connectors are in decent shape and actually had some dielectric grease on them from some TLC at some point.

I will post a picture of the mystery box tomorrow. It looks nothing like the standard "speed increaser" boxes that are available. This box is factory, It is too integrated into the factory harness to be after-market.

It sits literall above the throttle pedal under the dash and is bolted to a bracket that is definitely meant to be there. What I don't get it that it is not in the wiring diagram at all. The other 348 we have (TS) is wired exactly like the diagram. This one (93 Spider) has all the doors and locks going through this bizarre module above the throttle.

 

Jack Racing: That is it Exactly!!!!!!

So my questions for you are:

do you have a wiring diagram that includes this box so I can wire up the passenger door to work correctly?!!?!??!!!!

I found out today actually that the drivers door was taken from another car, which makes complete sense if it was taken from a non-spider or older 348 without the window ecu box.

 

It would be terrific to find a diagram. I am going to try to reverse engineer the passenger door and see if I can make it work......

 

Right that is the diagram I have. Not correct at all for this car.

 

Anyone know whether a diagram of this wiring exists?

I'd rather not have to reverse engineer the wiring and box to figure it out......

 

FYI The window ecu module in this car has very similar wire colors to the F355 Window ECU box for which the wiring is available.

So now to trace all the relevant wires through into the Door from the module and re-wire the Door....

It would still be great to have a relevant door connector pinout if anyone has one. Many more pins are populated in the door connector on the car side than the door side for this car... ie the door is not from a Spider.

 

The workshop manual for the Spider that I have unfortunately does not include this section. Is there some way you could upload it? Or Send to [email protected]?

Thanks.

 

I successfully rewired the drivers side circular door connectors to the Window ecu with the help of the 355 Wiring diagram to shed some light on what pins are what.

Now we are having a suspect window operation issues.

- I read that with the top down, the window should not quite roll up all the way. This is happening on the passanger side but not the drivers side.

- The drivers side window rolls all he way up when you take the key out of the ignition!!?!?!?

whats up with that??!?

 

anyone else's window roll up when the car is shut off??

 

Well the current fix is to unplug the connector going to the top of the window ecu box. The limit switch that is on the upper left of the windshield to detect that the top is up goes to this connector. There are several other wires going into this connector as well implying that there are more limit switches somewhere.

Is there a limit switch that reads when the top is fully retracted?