Blower Fan Speed only works on 1 and 4

[roastedchicken]

Hi All

Sorry if this has been raised before, but I've got a 2008 auris and the blower works on 1 and 4 only. 

I've dismantled everything in the dash, the contacts seem find within the rotation switch and I've tested from some rear test points, but the connector pin I can't easily correlate if it's actually working or not because I can't work out the pin-out. 

Has anybody had this issue? Just wondering if there's a way I can either fix it, or isolate it easily to the blower or control switch

Thanks

[roastedchicken]

Just to add, I've tested the blower resistor, appears to be fine? .8, 1.6 and 3.x ohms, seems reasonable

[furtula]

Blower motor working only on certain speed, or just one is symptom of a faulty resistor.

I'd check the pins first for some corrosion or bad contacts first.

Here are the schematics for manual AC

http://www.autocats.ws/manual/toyota/auris_corolla_zze-zr-nde-ade/rm04f0e/ewd/index.html