CK 30HST Cab wiring schematic - fan problem

[Retired guy]

Does anyone out there have the wiring diagram for a 2012 CK30 cab. My dealer does not even have it in the shop.
My heater fan only runs on low. The original 2 way switch showed continuity in both positions but I bought and
installed a new one - same results. I am looking to see if there is a hidden relay or separate fuse for high speed.
I suspected the resistor but it is the low speed that is working. Suggestions?

 

[perrypower]

Try this one

 

[Retired guy]

Try this one

Thanks but this appears to be the dash cluster. What I need is the diagram for the roof console that shows wiring for the heater parts.

 

[perrypower]

Here's the one for the Field option cab

 

[Retired guy]

Here's the one for the Field option cab

 

[Retired guy]

That's the one. Thank you. In your experience as a dealer, any thoughts on the problem?

 

[perrypower]

Honestly not sure, without actually testing it. I can't say that we've ever encountered that problem at our shop before.

 

[grsthegreat]

judging by that diagram, i suspect a bad relay OR a bad inline resistor (low speed ). would have to pull it to test though. and if i was going to go thru all that hassle, id just replace the parts, but thats just me. just getting to the parts will suck, at least on my DK45. been up there 2 times, not fun.

 

[Retired guy]

Had an hour today, took the roof off, traced the blue wire with the white tracer from the motor to a relay
and replaced it. Problem solved thank you perrypower for the schematic.