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Originally Posted by dj1111
Finally got back to the Venture this morning. Checked the fuse and it's ok and there is 12 volts at the fuse. Pulled the override switch and it looks like it's ok but... According to my manual there is a purple and dark blue wire going into and out of the switch. So I hooked the ohm meter at those to contacts on the switch thinking it would show and open and closed circuit when I switched the switch on and off. Well it didn't. There's also a gray and black wire going into the same plug as the purple and dark blue. It is the gray and black wire that shows on and off when the switch is turned on and off. Not sure if that means something is wrong or my manual is incorrect. Anyway, according to the manual the purple wire is the one that comes from the BCM. And I assume it should show 12 volts. Well it shows 7.5 volts. What do you think??
Thanks.
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I think you MAY have found the problem - it sounds like the switch is bad (Open).
Here is what I would do to confirm it. Do the following with the dimmer wheel turned (on the headlight controls) all the way ON.
Measure the voltage on the Dark Blue wire at the switch. It should have 12 volts on it. My manual says it should be Pin 5 of Connector # 1.
Flip the switch a few times ending in the ON position and measure the voltage at the purple wire. It should have 12 volts on it. My manual says it should be Pin 8 of Connector # 1.
If you don't have 12 volts on both sides of the switch (Dark Blue & Purple wires), then I would say the switch is bad. It could be confirmed by jumping the two wires. If the switch is bad, your interior lights should now be on.
A little info from my research:
The Dark Blue wire should have 12 volts on it, which comes from the BCM, through at least one other connector & cable. That could be called the "Input" side of the switch. The Purple wire connects to what could be called the "Output" side of the switch and would feed the 12 volts to the interior lights, if the right switches are turned on (dimmer wheel all the way ON).
One interesting note: While looking at the wiring diagrams, I noticed that there MAY be a 12 volt feed to an "Under-hood Lamp" in the same circuit that feeds the override switch. So - if you have this light under the hood, check to see if it works (I don't have one in my van). If it DOES work, the feed coming from the BCM should be OK.
I hope this helps. Let us know what you find.
Take Care,