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I'm working on a seat heater install (will post how I wire it later) and needed to ID the location of connector IE2. Between the similar nomenclature and the cold outside, I decided to photograph the connectors and identify them inside. Since I didn't see it anywhere else on the internet, I wanted to share.
If you are looking for the location of IA1, IA2, IA3, IA4, IA5, IC1, IC2, IC3, IC4, IE1, IE2, IE3, IE4, or IE5, take a look at the images. This is from a 2021 SR5. Note that IC2 is actually not in the pictures but the location is the same as IC4. IC2 was used pre-Sept 2019. Incidentally, the factory seat heater connectoris pin 5 on IE2 (the passenger side is pin 7 on IL3 but it isn't pictured)
edit: per the factory diagram, the seat heater is on pin 5 of IE2. During testing, I determined it is actually on pin 4 of IE2 which matches the color of the factory diagram.
If you are looking for the location of IA1, IA2, IA3, IA4, IA5, IC1, IC2, IC3, IC4, IE1, IE2, IE3, IE4, or IE5, take a look at the images. This is from a 2021 SR5. Note that IC2 is actually not in the pictures but the location is the same as IC4. IC2 was used pre-Sept 2019. Incidentally, the factory seat heater connector
edit: per the factory diagram, the seat heater is on pin 5 of IE2. During testing, I determined it is actually on pin 4 of IE2 which matches the color of the factory diagram.
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