Driver's side heated seat failure diagnosis

Appreciate the forum so thought I would share in case anyone finds this helpful for a heated seat no longer functioning. 2016 Tundra 1794 (absolutely love the truck) - 104,000 miles. Front driver's side heated seat failed (got extra warm just before failure - almost hot). Passenger seat heat and cooling worked fine as did cooling on the driver's seat. Checked fuses - all fine. Checked wiring under the seat and found that the seat heater control module (87501-0C020) and associated plug were fried at one end. Based on my research this isn't uncommon - glad it didn't catch fire. Control module is available but I haven't been able to find a replacement plug (looks like the plug isn't available - if anyone has a suggestion for the plug I'd appreciate it). Also reviewed the thread where someone hardwired to the module and eliminated the plug but I'm a bit hesitant to do that. Attached pics of the plug and module for reference.

Have an aftermarket warrantee (Truwarranty) so we'll see if it's covered. Been pretty good so far so fingers crossed.

 

Mine did the same thing, my plan was to go the scrapyard and cut the harness and module out of some other Toyota with seat heaters (I think they are all the same). Sadly, this task is harder than anticipated as there are not very many Toyotas in the scrapyard lol

 

2016 Tundra Platinum. The bottom drivers seat heater failed. My module is fine, however I have to replace only the bottom heater element. $1100 CAD.

 

Thank you for the post I noticed mine not working this week and found the same problem. The controller is not cheap…(over 100 bucks) anyone found what the connector is. I’d like to try and replace the connector is I’m spending that kind of money.

 

Drawing for the Molex connector
https://www.molex.com/content/dam/molex/molex-dot-com/products/automated/en-us/salesdrawingpdf/555/5557/039014050_sd.pdf?inline

P/N
0039014050

Ended up buying a Molex kit off of Amazon.

$24 Yoeruyo Mini-Fit Jr 4.2mm Pitch Connector with Premium 20AWG Pre-Crimped Cables,Compatible with Molex Mini-Fit Jr Single Row 1/2/3/4/5/6Pin 5557 Housing (MX4.2-5557-Single)

https://www.amazon.com/dp/B0CL9M349N

Waiting for the controller to arrive.

 

Thought I’d report back. So far after a 10 minute test Amit’s working, checked the controller, wiring and connector and nothing got hot. Thanks for the information for a fairly easy solve.

 

I had the exact same issue, BUT I decided to test if module is actually dead, so I removed connector completely and just soldered the wires directly to the module's pins and IT WORKED! All 3 heating levels work correctly. Looks like the connector burned out like fuse usually does...

So check your modules before changing.

Also I found the reason it happened one of the wires which goes to heating element in the seat was damaged by seat metal base.

 

Good to know I took my module apart and it looked the board was cooked. I didn’t want to pay the money but I didn’t want to do it twice either.

mines still working