Seven problems related to front seat heater/cooler have been reported for the 2004 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sienna based on all problems reported for the 2004 Sienna.
In early January 2011, the heater for the passenger car seat in my Toyota Sienna burned through the leather, through my 12 year old daughter's dress and superficially burned her leg. I believe the seat is defective as a fuse or other safety feature should have prevented such an injury/event.
I have 2 different complaints. Driver side seat heater burned legs of 3 different drivers before complete failure. Heat was not adjustable. Driver and passenger heaters stopped working at same time. Took to dealer, recommended new heating element ($1000+). Opted not to fix. 2nd complaint, check engine, vsc, and trac off lights illuminated. The van has been sent to the dealer on at least 3 occasions. Gas cap has been replaced several times, spark plugs changed. Will go off for brief periods, but always to return. This has been going on for at least 30,000 miles. I could live with the check engine light on, but if the other lights are illuminated, that indicates these components are not working-kind of important-skid control & traction control!! there are many complaints out there on blogs, doesn't look like anyone has filed any reports with your office regarding this same problem, which is too bad because it's obviously a problem not with just Sienna but several other models as well. Extremely frustrating when even the dealer can't determine what the problem really is!! we purchased this vehicle because of the safety features. Not so sure about it if their safety features malfunction!.
Toyota (2004 Sienna) seat heater burned a hole through the leather on drivers seat. Toyota (judy faul) interviewed me/my case and submitted to terrence chu (regulatory affairs). He wrote me a letter 3 months later and said Toyota was not at fault because I had a towel (8"x8" baby burp cloth) adjacent to my leg (left outer thigh) and the owners manual states "not to use an insulating object" with the seat heater operating. He never contacted me for clarification on the incident. I have been denied access to anyone at Toyota. The dealer (peoria, IL) said they will repair for $1337, but will not support me to repair the damage the faulty heater created. I can see their logic if sitting on a stack of towles, but not a rag, of which the consistency is less than the ski pants worn (with the heater operating) or my wife sweater dresses in the same manner. Personal friends (torry olsen) had the same year van and the same problem. Toyota repaired theirs as it was under warranty. The heater element is still hooked up (and dangerous) and Toyota will not service unless we pay.
Left side sliding door is not closing or opening automatically every time when button is pushed it won't open or close sometimes but only if I pull on the handle and pull it open part of the way and then it goes the rest of the way closed seat heater hasn't worked for at least a year I'm guessing even after having it "repaired"also the door won't lock or unlock with the automatic button anymore.
Left sliding door on 2004 Sienna xle limited is failing to work properly and front seat heater driver side stopped working- had it "repaired" and it still doesn't work.
Both seat heaters failed after 50k miles and 3. 5 years old.
Front driver seat heater quit working.
| Front Seat Heater/cooler problems | |
| Mid/rear Seats Assembly problems | |
| Seats problems | |
| Front Seat Recliner problems | |
| Front Seat Power Adjust problems |