Heated seats help !
01-26-2016, 11:42 PM
#22
Senior Member
iTrader: (1)
Sorry didn't see you posted,
Ok what you want to do to tie into the thermistor is positive to the purple, yellow-purple to the yellow-blue, yellow-green seat bottom to the yellow-green from seat back, ground to black-blue
This "should" put the thermistor into play.
The way the thermistor works as a NTC is as the heat rises, the voltage decreases, so having this in line with your circuit will keep the operation of normal heated seats,
Picture the NTC as a resistor that changes its resistance based on temperature, there are 2 kinds of thermistors NTC, and PTC, PTC increases voltage as the temp rises.
Ok what you want to do to tie into the thermistor is positive to the purple, yellow-purple to the yellow-blue, yellow-green seat bottom to the yellow-green from seat back, ground to black-blue
This "should" put the thermistor into play.
The way the thermistor works as a NTC is as the heat rises, the voltage decreases, so having this in line with your circuit will keep the operation of normal heated seats,
Picture the NTC as a resistor that changes its resistance based on temperature, there are 2 kinds of thermistors NTC, and PTC, PTC increases voltage as the temp rises.
02-06-2016, 12:06 PM
#24
Senior Member
Thread Starter
Update:
I bought powered seats with heat pads to upgrade the manual cloth seats in my 2013 Ford Fusion. The goal here was to wire the factory heated seats with an aftermarket control switch/wiring harness (hi-mid-lo-off setting)
1st attempt - Applied 12V to the violet wire going through the thermistor; spliced YE-VT and YE-BU together hoping that voltage would pass through and go up YE-GN to the top heat pad. Applied ground to BK-BU. No luck there.
2nd attempt - Applied 12V directly to YE-BU wire and ground to BK-BU and voila ! I have Heat in my factory pads but the downside to that is that I have no thermistor to monitor whether or not the pads overheat. Taking a big risk but I live in texas, our quote on quote winters are very short.
I bought powered seats with heat pads to upgrade the manual cloth seats in my 2013 Ford Fusion. The goal here was to wire the factory heated seats with an aftermarket control switch/wiring harness (hi-mid-lo-off setting)
1st attempt - Applied 12V to the violet wire going through the thermistor; spliced YE-VT and YE-BU together hoping that voltage would pass through and go up YE-GN to the top heat pad. Applied ground to BK-BU. No luck there.
2nd attempt - Applied 12V directly to YE-BU wire and ground to BK-BU and voila ! I have Heat in my factory pads but the downside to that is that I have no thermistor to monitor whether or not the pads overheat. Taking a big risk but I live in texas, our quote on quote winters are very short.
09-01-2017, 10:18 PM
#25
Senior Member
Thread Starter
Hey K,
I'm going to try it this way,
I'm adding the relay as seen below, with the Thermistor wired inline between 87A and 86. My thought is that the relay will cut off power to the heating element once the NTC thermistor builds up enough current to energize the coil in the relay.
what do you think ?
I'm going to try it this way,
I'm adding the relay as seen below, with the Thermistor wired inline between 87A and 86. My thought is that the relay will cut off power to the heating element once the NTC thermistor builds up enough current to energize the coil in the relay.
what do you think ?
