I searched the threads but didn't find any reference to my question. Are you really supposed to have 12vdc between pins 3 & 4 on the O2 sensor wiring harness coming from the heater relay? or just some form of voltage (less than 12vdc)? I'm pretty sure my O2 sensor is bad, but I didn't get 12 volts between those pins. Also, to test the relay I can just swap the relay to the Fuel pump? its the same type of relay?
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Yes you can swap those two relays. I don't have an ETN (wiring diagram) handy, so i can't speak to the voltage question. You can get the ETM for your car from http://wedophones.com/BMWManualsLead.htmThe car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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I think I've got bigger problems
When I bought the car, the fog lights & cruise control didn't work. No big deal, I thought, I'll just fix 'em. Well, I started probing around, and I either have no voltage or very little voltage all the way back to the relays and fuses. Now when I find the same thing to the O2 heater relay, I wonder what the hell is going on. I did find evidence that the car previously had an aftermarket alarm system (holes where an alarm horn was mounted, and a couple of disconnected LED's below the instrument cluster) that had been removed, and I'm wondering what they fucked up in the process.
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