Demon possessed heated seats!

[NotJLB]

I think it's all related, but our seat memory has a mind of it's own, too. If we set it on Driver 1, when you turn off the ignition, the seat goes to a mysterious, crumpled-up setting, definitely not what we set Driver 1 to.

So, we set Driver 2 to a mutually agreeable position, and when we shut off the ignition, it stays at that setting, and stays there when we start the engine again.

If I accidentally bump the setting button on the door panel, which is easy to do, I'm screwed when I shut the engine off.

I say I think it's related because I think it's a computer issue, and that's what the TSB fixes. I think.

 

[rgosart]

The issue is most likely in the DDM or driver window switch. Unplugging the switch will do nothing but keep you from shutting the seat heater off.

My guess would be that it would also fix the issue with your memory seat.

 

[ivin74]

Did you read Post#5?

Yes I did, I have not had time to work on my rig. Hopefully I can get to it soon, until then I'll be driving my 335i

 

[NotJLB]

The issue is most likely in the DDM or driver window switch. Unplugging the switch will do nothing but keep you from shutting the seat heater off.

My guess would be that it would also fix the issue with your memory seat.

You talking to me?

You think that's what the TSB shown in Post 5 told the techs to do?

 

[LEDFoot]

The issue is most likely in the DDM or driver window switch. Unplugging the switch will do nothing but keep you from shutting the seat heater off.

My guess would be that it would also fix the issue with your memory seat.

Do you know exactly what functionalities are contd by the DDM? I am having issues with a few things:
Seat memory (can be set but does not operate)
Remote Door Lock (remotes can be programmed but will not operate).
Power pedals will not move.

Windows and power mirrors with fold works fine though.

As far as I can tell there are multiple p/n for the module with various functionality but I cannot seem to find a comprehensive list.

 

[rgosart]

I know for a fact that the DDM does not control remote door lock. Mirrors, heated seats, and I believe memory all run through the ddm. Sounds like your issue might be something more than that.

Sent from my SM-G950U using Tapatalk

 

[rgosart]

You talking to me?

You think that's what the TSB shown in Post 5 told the techs to do?

Not sure. I didnt read it. Maybe it's a ddm program/calibration change.

Reason I said what I said is my friend and his dad have nbs trucks with this issue. He bought a couple good used ddms and it seems to have fixed the issue

Sent from my SM-G950U using Tapatalk

 

[rgosart]

This is the only bulletin I can find on heated seats coming on by themselves. The bulletin numbers in post 5 return no results on GM Service Information...

#PI01850: Driver or Passenger Heated Seats Turn On By Themselves - kw GMT800 GMT805 GMT820 GMT830 seat unwanted heat right left front switch operation - (Mar 8, 2004)
Subject: Drivers or Passengers Heated Seats Turn on By Themselves

Models: .

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
A customer may comment that the front passenger or drivers heated seats turn on by themselves. Dealer technicians my not be able to duplicate the concern and no DTCs will be set. This concern maybe caused by the customer inadvertently contacting the heated seat switch.

Recommendation/Instructions:
To correct this concern, a new low profile switch has been released. The new part number switches are as follows:

15116861 passenger

15116862 drivers w/ memory, heated, and adjusted pedals

15116863 drivers w/ memory and heated only

.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

Models:
(03 and 04 Chevrolet Silverado) and (03 and 04 Chevrolet Avalanche) and (03 and 04 Chevrolet Tahoe, Suburban) and (03 and 04 GMC Sierra, Sierra Denali) and (03 and 04 GMC Yukon, Yukon XL, Denali, Denali XL) and (03 and 04 Cadillac Escalade, EXT, ESV)

 

[LEDFoot]

I know for a fact that the DDM does not control remote door lock. Mirrors, heated seats, and I believe memory all run through the ddm. Sounds like your issue might be something more than that.

Sent from my SM-G950U using Tapatalk

Are you sure, you program the remotes through the DDM?

I can follow these instructions and everything happens as described, except the remote doesn't actually operate the door locks.
https://northcoastkeyless.com/2004-chevrolet-suburban-keyless-entry-remote-programming-instructions/


Very possible I have more issues though, my truck was thrown together from multiple other used vehicles from what I understand.

 

[rgosart]

Are you sure, you program the remotes through the DDM?

I can follow these instructions and everything happens as described, except the remote doesn't actually operate the door locks.
https://northcoastkeyless.com/2004-chevrolet-suburban-keyless-entry-remote-programming-instructions/


Very possible I have more issues though, my truck was thrown together from multiple other used vehicles from what I understand.

The sequence to enter the programming mode does not mean that the DDM is what controls your remote door locks. TPMS learn is initiated through the headlight switch...

It may be a different story if your unlock button does not work properly