JohnDoe_5oh
Member
- Joined
- Dec 15, 2020
- Threads
- 1
- Messages
- 19
- Reaction score
- 8
- Location
- St. Louis MO
- First Name
- John
- Vehicle(s)
- 2017 Mustang Ecoboost Premium
- Thread starter
- #1
My wife and I bought a used 2017 Mustang Ecoboost Premium 6spd manual. So far we love it. But we’ve since run into a couple of issues with the ‘premium’ features. The car has heated/cooled seats and in the summer we ran into an issue where the drivers side seat wouldn’t cool. It did nothing, no relay click, but the dash button would show that it was enabled. The passenger seat worked, but didn’t blow very cool air. You could basically only hear that the air came on and that’s about it. I figured at the time it was a fuse, so I didn’t look too much into it.
Now that its winter, my wife is excited to use the heated seats. When you’d enable them, the same issue arose where the driver seat did nothing but the passenger seat would turn on, but the catch this time was that the passenger heated function would only stay enabled for 30 seconds.
I started researching and found that the control module plug under the passenger seat suffered from a known overvoltage/under sized ground issue. So, I pulled the connector only to find that its perfectly fine. Damn.
I checked fuse 12, 13, & 14 under the hood, no issues there. Damn. I checked fuse 12 in the passenger kick panel, no issues there. Damn, fuses all check out good. No easy fix here.
I decided to inspect the control module (found under the passenger seat) and found a tiny fragment of solder on one of the circuit pathways:
That led me to replace the control module (GU5T-14B663-AA). Once I finally received it ($95 new from ebay), I was pretty excited as the cooled seat function worked on both seats and it pushed air pretty good too! However, the heated function is still not working. Damn. The heated function will turn on (I hear the relay click on the new control module) for both seats, however, it only stays on for 30 seconds then turns off. This is the primary cause of the whole post. It did this with the passenger seat with the old module which leads me to believe there's something that is affecting the climate system as a whole.
This has led me down a wild path with forscan and awkwardly positioning my quickly-approaching-middle-aged body under the seats looking for any sign of problems.
I couldn’t find anything under the seats that would lead me to believe something is happening there, except maybe that the grate on the blower motor seems insanely dusty, the passenger seat looks perfectly clean:
I started to check forscan to see if maybe there was something there that might have been adjusted by a previous owner. The only thing I could find was that the heated/cooled seat button for the touch screen wasn’t enabled. Not sure why, so I enabled it. It works the exact same as the physical buttons, literally no difference.
Then I found the Oscilloscope in forscan and there you can watch processes as they come across. In the following graph you can see the 3rd (turquoise) and 6th (purple) graphs are the buttons pushed to enable cooled seats (they’re even called out as ‘cooled seat’ in the table below), but the graphs for heated seats are what see the corresponding increase. I found that odd, but hey, they worked without issue, so that’s something.
Now, in the following table, for the time the cooled seats are enabled, it shows an error for each heated seat while the functional seat cooling is working without issue. Not sure why.
Next I turn the cooled seats off and you can see the step down in the graph with each button push (3 button presses to get them to the off position):
Do the steps down correlate to a voltage decrease? I assume so, but I digress. Now you can see that all 4 of the buttons (D&P heat, D&P cooled) are in the ‘inactive’ state (since they aren’t being pressed) and the seat status is ‘Manual Off’, which I would expect since I manually turned them off.
Here comes the fun part. Once I turned off the cooled seats (I let them run for about 5 minutes), I decided to turn on the heated seats. You can see the top two graphs (red and green) are the button presses and the heated seats are enabled in graph 4 (pink) and graph 5 (yellow) show a steep increase.
The value of both heated seats is now “Manual High Heat”. Great! Except that this status only lasts for 30 seconds, give or take a few seconds.
In the next graph you can see that the passenger side seat (graph 5-yellow) turns off and a few seconds later the drivers side seat (graph 4-pink) follows suit. But this time, they’re not accompanied with any button presses as seen previously
I then go back to the table to check on the status (value) and see that they’re in “Manual Off”.
My question, is what would cause the manual off? This only happens with the heated seats.
I will add that in checking forscan, I found that someone disabled the seatbelt chime reminder. Maybe there is a setting I missed? I know there is an “auto off” for heated seats in my F150 that turns them off after 20 minutes automatically. Could that be the issue here? Perhaps a previous owner changed this setting by accident?
Right now I have the positive battery terminal off in hopes of draining the capacitors and resetting something. I’ll post back once I’ve let it drain for 24 hours.
I appreciate any advice or input.
Now that its winter, my wife is excited to use the heated seats. When you’d enable them, the same issue arose where the driver seat did nothing but the passenger seat would turn on, but the catch this time was that the passenger heated function would only stay enabled for 30 seconds.
I started researching and found that the control module plug under the passenger seat suffered from a known overvoltage/under sized ground issue. So, I pulled the connector only to find that its perfectly fine. Damn.
I checked fuse 12, 13, & 14 under the hood, no issues there. Damn. I checked fuse 12 in the passenger kick panel, no issues there. Damn, fuses all check out good. No easy fix here.
I decided to inspect the control module (found under the passenger seat) and found a tiny fragment of solder on one of the circuit pathways:
That led me to replace the control module (GU5T-14B663-AA). Once I finally received it ($95 new from ebay), I was pretty excited as the cooled seat function worked on both seats and it pushed air pretty good too! However, the heated function is still not working. Damn. The heated function will turn on (I hear the relay click on the new control module) for both seats, however, it only stays on for 30 seconds then turns off. This is the primary cause of the whole post. It did this with the passenger seat with the old module which leads me to believe there's something that is affecting the climate system as a whole.
This has led me down a wild path with forscan and awkwardly positioning my quickly-approaching-middle-aged body under the seats looking for any sign of problems.
I couldn’t find anything under the seats that would lead me to believe something is happening there, except maybe that the grate on the blower motor seems insanely dusty, the passenger seat looks perfectly clean:
I started to check forscan to see if maybe there was something there that might have been adjusted by a previous owner. The only thing I could find was that the heated/cooled seat button for the touch screen wasn’t enabled. Not sure why, so I enabled it. It works the exact same as the physical buttons, literally no difference.
Then I found the Oscilloscope in forscan and there you can watch processes as they come across. In the following graph you can see the 3rd (turquoise) and 6th (purple) graphs are the buttons pushed to enable cooled seats (they’re even called out as ‘cooled seat’ in the table below), but the graphs for heated seats are what see the corresponding increase. I found that odd, but hey, they worked without issue, so that’s something.
Now, in the following table, for the time the cooled seats are enabled, it shows an error for each heated seat while the functional seat cooling is working without issue. Not sure why.
Next I turn the cooled seats off and you can see the step down in the graph with each button push (3 button presses to get them to the off position):
Do the steps down correlate to a voltage decrease? I assume so, but I digress. Now you can see that all 4 of the buttons (D&P heat, D&P cooled) are in the ‘inactive’ state (since they aren’t being pressed) and the seat status is ‘Manual Off’, which I would expect since I manually turned them off.
Here comes the fun part. Once I turned off the cooled seats (I let them run for about 5 minutes), I decided to turn on the heated seats. You can see the top two graphs (red and green) are the button presses and the heated seats are enabled in graph 4 (pink) and graph 5 (yellow) show a steep increase.
The value of both heated seats is now “Manual High Heat”. Great! Except that this status only lasts for 30 seconds, give or take a few seconds.
In the next graph you can see that the passenger side seat (graph 5-yellow) turns off and a few seconds later the drivers side seat (graph 4-pink) follows suit. But this time, they’re not accompanied with any button presses as seen previously
I then go back to the table to check on the status (value) and see that they’re in “Manual Off”.
My question, is what would cause the manual off? This only happens with the heated seats.
I will add that in checking forscan, I found that someone disabled the seatbelt chime reminder. Maybe there is a setting I missed? I know there is an “auto off” for heated seats in my F150 that turns them off after 20 minutes automatically. Could that be the issue here? Perhaps a previous owner changed this setting by accident?
Right now I have the positive battery terminal off in hopes of draining the capacitors and resetting something. I’ll post back once I’ve let it drain for 24 hours.
I appreciate any advice or input.
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