Tackling Factory Controls or: How I learned to stop worrying and love

Crstfr · October 16, 2018

dope thread... .big up OP!!!... ..

Darth_Vader · October 23, 2018

On 10/15/2018 at 9:29 PM, pgamboa said:

Great to see you back! Sorry to hear about ankle surgery. Hope/Pray for a quick recovery.

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Thanks, Phil! Been a busy year, but I'm hoping to get back into documenting some things, trying some new stuff out, seeing what kind of fun we can have! Going under the knife tomorrow, for the second time, but I'll actually be in the road to recovery after this surgery!

-Kyle

Darth_Vader · November 16, 2018

Have had some people who want to try themselves and attack this but need some extra info, so here you go! This is the addresses, commands and responses for the factory heated seat switches (works with the seat cooler switches too) on the LIN bus.

Poll Command Passenger at 35ms
20 30 F5 61 FF Wake Command
61 Status Poll (Leave this blank, will return switch status that corresponds below)

Poll Command Driver
80 30 F5 61 FF Wake Command
C1 Status Poll

Driver seat frame ID is C1
Heated Back
Off: C1 00 00 00 00
Low: C1 00 09 00 00
Medium: C1 00 0A 00 00
High: C1 00 0B 00 00

Full Heat
Off: C1 00 00 00 00
Low: C1 00 05 00 00
Medium: C1 00 06 00 00
High: C1 00 07 00 00

AC
Off: C1 00 00 00 00
Low: C1 00 0D 00 00
Medium: C1 00 0E 00 00
High: C1 00 0F 00 00

Passenger seat frame ID is 61
Heated Back
Off: 61 00 00 00 00
Low: 61 00 09 00 00
Medium: 61 00 0A 00 00
High: 61 00 0B 00 00

Full Heat
Off: 61 00 00 00 00
Low: 61 00 05 00 00
Medium: 61 00 06 00 00
High: 61 00 07 00 00

AC
Off: 61 00 00 00 00
Low: 61 00 0D 00 00
Medium: 61 00 0E 00 00
High: 61 00 0F 00 00

Good luck!

Kyle

Tahoe01to04 · November 29, 2018

Kyle,

Really appreciate you taking the time and sharing all this info. Pretty sure Ive read and watched every article or video on the internet related to installing Lin controlled heated seats in an older car. Was starting to think it would be impossible until I saw your youtube videos. It did take quite a bit of searching to find this forum, and just about jumped up and down once realizied the rest of your findings were posted here. Especially since ive already purchased the front and second row heated seats and door panels with switches from a newer donor tahoe. Im getting ready to purchase all the items you listed but do have a few questions. Since I have 4 seats trying to heat, thinking I will need to buy double of everything you listed? Or do you think I can use Lin 1 for the driver front seat switch and driver second row seat switch together? And Lin 2 fot the passenger front seat switch and passenger second row seat switch together? Im thinking will probably have the same issue between the driver and passenger 2nd row switches response being same like you had with the front switches. But not sure if it will be a problem having the 2 driver switches together on Lin 1 and 2 passenger switches together on Lin 2. I know will have to buy 2 of the 4 channel mosfet switches for the seat heaters though. Also, curious if you would have any insight on the workings of the bcm? I do have the bcm and wiring from the donor car. Do you think it would be possible to do a passlock bypass on the donor bcm and install it as a standalone for just the seat heaters and factory switches, not controlling anything else. Keeping my original bcm also installed to control everything like normal? This has also been something Ive searched endlessly for on the internet. Not finding anyone ever trying and posting or knowing if it would work. Any info you can provide would be greatly apprecited, as I would say you would be the only person that might know the answer....Thanks again....Sean

Darth_Vader · December 2, 2018

Sean,

You are really going to the extreme! Ditch the BCM, not worth the hassle as there is a lot of communication going on that will keep the thing from even wanting to start to work. You are headed in the right direction, the only issue you are going to have is the rear heated seat switches are going to have different addresses, the commands are going to be the same most likely but you will have to figure out the addresses. You will need probably need two Canny's as it is now as I haven't had time to dig in further to try and figure out a way of getting all the switches on the same LIN channel without having them respond. Not saying it can't be done I just haven't spent a lot of time trying to do it. Your best bet is to find someone who has the rear heated switches that is nice enough to let you put a LIN sniffer on the switches to try and capture data to see what the addresses are, that is how I got the original addresses for the front ones.

Good luck!

Kyle

pgamboa · December 2, 2018

Glad to see you back and hope the surgery went well. Could you PM me? Need to get more info on this if you have a sec. thanks!

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Mnotias · December 12, 2018

Hey so with this controller I can add heated seats to a truck that doesn’t have them using factory switches?

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Brandon h · February 16, 2019

Let me know how to buy ?this guy is awesome

Brandon h · February 22, 2019

hey has anyone been able to get a copy of the program that is readable

silveradosid · February 26, 2019

you can try and pm harlech, but i think he is in recovery mode hope he is ok

pgamboa · February 27, 2019

All,

I wanted to share an update on Harlech (OP). He underwent surgery today. For some reason, i thought he had surgery months ago. He actually had several surgeries between then and today.

He has responded to me and is doing well, but is in recovery mode. He asked me to let you all know that once is back at 100%, he will be back to update this thread.

Thanks!

Brandon h · February 27, 2019

thanks I was able to build the diagram but cant see the addresses or commands

chevy heated seats program.cfd

silveradosid · February 28, 2019

thanks phil for the update

odave · March 3, 2019

I have successfully completed this mod using Harlech's parts list, although I'm using factory heating elements. It works great and is relatively easy, but I did need Harlech's programming wizardry assistance

The only draw back is the pulse width modulation used to control the 3 heat (L-M-H) settings needs adjusted as all 3 settings are extremely hot. I'm sure this has to do with me using the factory heating elements as they are designed to utilize a thyristor feed back signal to the bcm or seat module to control element temp and there is no way of utilizing it. This is by far the best/easiest way to add heated seats utilizing the factory switches. I'm planning on adding heated seats to the back seats using this same method. Big thanks to Harlech for all the work in figuring this out

Brandon h · March 3, 2019

That’s awesome I’m hoping I can get him to program mine?. I have the harness built and the factory bezel and buttons and the canny 7 all wired up ready for programming .