04-16-2014, 09:24 PM
Join Date: Feb 2012
Location: Johnson City, Tn
Total Cats: 1
Heater fan does not work after MS3/MSx
93 Miata with an 03 1.8 and MS3/MSx (DIY)
I pulled the blower unit (heater fan) in order to get to the wiring through the firewall.
I have not gotten to testing AC yet,no rush on that.
When i turn the fan on, I get nothing. Does the MS3/MSx have anything to do with the fan working? From my basic reading the diagrams it does not look like it does.
I understand that the AC will not engage without the fan on but I do get the AC light on TunerStudio when I engage the AC, so I know that signal is coming from the AC to the ECU.
I have checked the fuse, the windshield wipers (evidently they use the same relay under the dash).
I just need to know if I am hunting something that is controlled by the ECU or just a simple relay.