Posted by Paul Edge on September 16, 2018, 7:47 pm
Year of Manufacture: 2010 ( Optional ) Engine Code or CC: 3000 td
Heater not blowing hot and all 4 heater vents don't close when engine is switched off or open when engine is switched on. Fault code for lin bus fault So we have 2 blend motor flaps and four heater vent registers(flap) All have a 12 volt supply All have an earth Both load tested Looking at diagram. We have a heater ecu.which we have a lin bus out terminal. This lin bus goes in to one blend motor .then out to the other blend motor. Then to the other flaps.(a series set up) I have scoped pin bus at every in and out terminal. And I get lin bus scope pattern 12v (on)0 volts (off)looks like what I would expect. So I seem to have what the car needs to operate this system . My question is .where should I be going now.what approach would you techs use now. Sorry for the long post