A/C and Auto recirculate won't activate on IHKA

[YoitsTmac]

Hi everyone! Well I'm sad to say that I need some extra help with a minor issue. Seemingly all at the same time, the following things happened:
- the OBC screen brightness was locked at full brightness
- the A/C won't light up when pressed
- the circulation button skips over "auto circulation" when pressed

Anddd that's all I've discovered. So I went home and recoded the cluster and that fixed the auto-brightness, so just a small hiccup. I tried cleared the codes on the A/C in PA-Soft but the codes remained. I had the following codes:

16[022] Additional heater, Rear Windshield defogger
1B[027] Communication with the Additional Heater

The 1B[027] went from present to not currently present on clear, but won't go away. I then tried my defrosters and both showed activation on the IHKA. This is feeling like a massive electrical bug. Tomorrow I will try disconnecting and reconnecting the battery. I should have recoded the IHKA like I did the cluster, but didn't think of it. Aside from that, I'm a little stumped on other trouble shooting I could do.

I also have BlueBus, but I suspect this issue is unrelated. I mention this because BlueBus causes my IHKA to periodically reset when sitting at a light or cruising at high speed (IE: reboots and returns to whatever settings the car turned on with.)

[cakM3]

I also have BlueBus, but I suspect this issue is unrelated. I mention this because BlueBus causes my IHKA to periodically reset when sitting at a light or cruising at high speed (IE: reboots and returns to whatever settings the car turned on with.)

Have you sent Ted an email regarding this?

[YoitsTmac]

I did a long time ago. He said he found a car that had the same issue and I believe he said he solved the issue for most IHKA's. This still happens to me.

bump on the main issue. I unplugged the battery and tried to reset the IHKA, both with no luck. I'm beginning to suspect internal fault

[YoitsTmac]

bump. At a loss for troubleshooting from here

[PdZHP]

Is it possible that the temperature control until failed? I've read that the fan inlet can get clogged with debris and the unit overheats. Maybe obtain replacement from a local pull a part to test.

[YoitsTmac]

Is it possible that the temperature control until failed? I've read that the fan inlet can get clogged with debris and the unit overheats. Maybe obtain replacement from a local pull a part to test.

Thanks for this. I never knew about the overheating. I ordered a facelift unit for $30 to my door. For the time, gas and effort of pulling a unit, just seemed to make sense. Thanks! I will keep everyone posted!

[YoitsTmac]

Could this be caused by a failing FSR? I already bought a new IHKA, but just remembered I've been actively putting off my FSR

[YoitsTmac]

Bought the IHKA, installed it, fixed, 5 drives later there's no air allowed at all regardless of input, and then wouldn't start next start. FSR was supposed to come today but FedEx doing what it does best.