Heater won't turn on

My heater won't turn on, seat heater won't turn on, and outside temp gauge all malfunctioned while driving. I didn't see any blown fuses on fuse box. Any suggestions please?

 

Both, ambient temp and seat heaters go through the AC amplifier.

There's a 28 and 32 pin connector. I'd check to make sure they're fully seated.

 

ok, thanks

 

I checked the 32 and 28 pin connector, both are seated. Still no power to heater, mirror heater, and temp gauge. Do you know of other possible causes?

 

Did you check both fuse boxes?

 

any update? Mine just did the same.....

 

My heater was disabled and stuck on heat. The lane assist sensors are on the same circuit and were corroded. I disabled the lane assist as I didn’t want to spend $800 to fix them. Fixed my problem.

 

By lane assist do you mean BSm (blind spot monitor)?

 

Check your body grounds. Had the same issue on a friend's TRD Sport and the corroded ground was showing as good, but not enough of a connection to run the heater. Removed and cleaned and those electrical gremlins disappeared. Just an idea.

 

OP try this. https://www.tacomaworld.com/threads...r-defog-stopped-working.774321/#post-28195955