Gibbs
Senior Member
Today I installed 68366553AA HVAC module for a 2018 2500. It almost instantly corrected the temperature problem. The indicator lines up perfectly with the servo position and the arrow tracks up and down smoothly with no skipping like before.
The problem now is the Rear Defrost icon is grayed out. I don't have rear defrost, but I do have heated mirrors. I'm assuming the mirrors won't work if the icon is inoperative. Is this correct?
The icon worked before with the old module with UAS radio and with RA4 radio.
Any ideas on this? This is one feature I use all the time, and it seems like I traded one problem for another... Dang it, so close!
Edit to add: if I press the physical button on the dash for Rear Defrost, the LED flashes 3 times then goes off.
The problem now is the Rear Defrost icon is grayed out. I don't have rear defrost, but I do have heated mirrors. I'm assuming the mirrors won't work if the icon is inoperative. Is this correct?
The icon worked before with the old module with UAS radio and with RA4 radio.
Any ideas on this? This is one feature I use all the time, and it seems like I traded one problem for another... Dang it, so close!
Edit to add: if I press the physical button on the dash for Rear Defrost, the LED flashes 3 times then goes off.