I'm hoping one of you guys with an early-model 540i can pop the hood and help me out with this, or just happen to know what it is. I just finished doing a valley pan replacement on my car, and was scrupulous in labeling all the wires and connectors on both sides, but when I finished, this one was left, and as short as it is, with no apparent place to plug in. It has one red wire with a white stripe, and one blue wire with a yellow stripe.
As you can see in the pic, it is in the topmost wiring loom coming out of the passenger side injector electronics box, and is wrapped with three other wires/connectors - one goes to the Idle Control Valve, a second goes to the Primary Throttle Body Throttle Position Sensor, a third goes to the Secondary Throttle Body Throttle Position Sensor.
I don't know where this one goes - all the sockets I can find are already occupied, including the mapping thermostat. It could be that it was never plugged into anything - it's pretty dirty inside and out. Anyway, I'd be grateful for any help, even if it's just knowing that it's supposed to be unused.
Thanks in advance for any help.
Last edited by Hotswimmer; 07-16-2006 at 08:56 PM.
mine has the same connector, it does not go to anything. My car has never been taken apart.
1994 rx7 twin turbo base model
chaste white
R1 front and rear spoilers
racing beat springs
tokico 5 way adjustable shocks
rx7 store downpipe
resonated midpipe
Greddy SP cat back
Pettit HOT air intakes
Apex'i GT spec FMIC
Apex'i power FC
E-bay power pullies
fluidine radiator
supraTT fuel pump
Spec stage 2 clutch
17" Borbet type t wheels
BMW 540i
automatic
107k
silver with grape ape interior
a few beaters
Thank you, Scott - I owe you big. I was seriously stressing...
I have found the definitive answer to this question. These wires go to the vacuum valve for the secondary air injection, if you don't have secondary air injection this plug will be left disconnected at the factory.
http://cdn4.pelicanparts.com/techart...arge/pic01.jpg
As with many cars, this is quite common. Model changes, engine changes, accessories changes etc... It's much cheaper and simpler for manufacturer to produce wiring harness with extra connectors instead changing it half way through production or for some other reason.
Since I have the same car, I think I remember that extra connector as well. I love the fact that 98 has no secondary air injection vs 99+.
Last edited by BMW540san; 03-13-2017 at 09:08 AM.
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