Why wouldn't a blower motor work?

[AndrewBird]

I think he was talking about the main fuse box board.

[isaac.delgado]

Food for thought, the blower stopped working on my car, so I took a known good one out of my other car and it still didn't work. Tons of fuse checking and wire tracing later, ended up the contacts on the fuse board had cracked. I had to resolder them.

After that, problem free blower motor. :)

Where is the fuse board located?

[m-tech E30]

this happen once to a car..
check the switch that starts the heater motor, the one with 1through 4 that could be shorted, the relay on the motor... or
If you have a key chain dangling and touches the turn signal shaft... that can short the fuse too. while car is driving.

[nando]

your unloader relay is not hooked up properly, it is probably grounding out which is why none of that stuff works.

[E30Nova]

Food for thought, the blower stopped working on my car, so I took a known good one out of my other car and it still didn't work. Tons of fuse checking and wire tracing later, ended up the contacts on the fuse board had cracked. I had to resolder them.

After that, problem free blower motor. :)

[glucklich21]

Your car's windows working correctly?

Also, to further clarify, fuse 1 would have nothing to do with either problem, it's just a convenient 7.5A fuse to swap with. :)

Fuse 10 controls a whole load of things that are tied to the ignition, most obvious is the gauge cluster. If that works, it is a safe assumption that relay is getting power.

Fuses 19 and 20 are the ones controlled by the relay.

As you tested, Fuse 1 should only show power with the high beams on, fuse 10 with the ignition on, and 20 with the ignition on and the car not cranking.

The unloader relays receive +12v from the ignition, and ground out through the starter windings.

I'm thinking there's a fault with the engine harness some where because whenever I unplugged it and re plugged it everything started working again this afternoon. Whose to say how long it will last, but we will see. Just another reason to go ahead and drop in my M50 already.



No my windows were not working. I can't go over it anymore for the time being, my E30 is now 4 odd hours away at my parent's house. I won't be able to drive it back down here for awhile and tinker with it.

[DaveSmed]

Your car's windows working correctly?

Also, to further clarify, fuse 1 would have nothing to do with either problem, it's just a convenient 7.5A fuse to swap with. :)

Fuse 10 controls a whole load of things that are tied to the ignition, most obvious is the gauge cluster. If that works, it is a safe assumption that relay is getting power.

Fuses 19 and 20 are the ones controlled by the relay.

As you tested, Fuse 1 should only show power with the high beams on, fuse 10 with the ignition on, and 20 with the ignition on and the car not cranking.

The unloader relays receive +12v from the ignition, and ground out through the starter windings.

[glucklich21]

Switched the relay with the known working one from my fogs. Still nothing.

Edit: I should point out I've noticed my mirrors have stopped working as of today. OBC is still kicking as is the cluster.

[glucklich21]

So I just took a volt meter to fuse #'s 1, 10, 24 (as a visual that connection was being made with the voltmeter), and 20. My control fuse, #24 was the only one with power.

So I'll throw in one of my spare relays and see.

['e30love']

Ok I'll try that when i get home

[DaveSmed]

Visually is not enough. If all your headlights work, swap fuse 10 with fuse 1. The element could have a small crack.

['e30love']

Pretty sure I checked and no blown fuses I'll check again I doubt it thou

[DaveSmed]

Is fuse 10 blown, causing the dead cluster?

Fuse 10 powers unloader relay K7, which in turn supplies power to fuses 19 and 20, which among other things supply the blower motor and power mirrors.

['e30love']

Windows and sunroof work. Mirrors stopped working and cluster and obc don't work.
When I turn on the car the blower motor works, when the car actually turns on the blower motor stops working.

My car very rarely but it does it'll turn off when I'm driving and a couple times it turned back on. Could something be loose in the ignition when you insert the key that could cut it off like move the key just enough to turn off the car?

['e30love']

Huge hints right there. Do you also happen to be having problems with your power windows, sunroof and power mirrors too?

Windows work sunrof works side mirrors stopped working, cluster doesn't work occasionally the speculated tries to work. I'll be swapping out my dah next weekend I'm prepared to see an electrical mess and be prepared for questions and pictures