Heated Seats — Front
Vehicles equipped with front heated seats are equipped with a single-heated seat module to control both front heated seats. The heated seat module is mounted to the bottom of the front passenger seat. The heated seat module does not time out. The system will function with the ignition in RUN, whether the engine is running or not. The heated seat module supplies voltage to the heater mats and regulates seat temperature by monitoring a thermostat located in the cushion heater mat.
The heated seat buttons are part of the Front Controls Interface Module (FCIM). When a heated seat button is pressed, the FCIM sends a command message over Medium Speed Controller Area Network (MS-CAN) to the HVAC module. The HVAC module then momentarily grounds the request circuit to the heated seat module to turn the heated seat ON or OFF. Upon receiving a momentary ground, the heated seat module will decrease one setting (the sequence is high, low, off and high).
When the heated seat module is on it provides a signal back to the HVAC module. The HVAC module then communicates messages back to the FCIM to turn the indicators on. Both indicators illuminate in high, one indicator illuminates in low and neither will be illuminated when off.
The heated seat module does not report DTCs and does not communicate on the CAN . If a fault is detected, the module will disable the affected seat(s) and indicator(s).
After the fault is corrected, the heated seat module needs to be reset by cycling the ignition OFF and then ON. After the heated seat module has been reset, the module will return to an off state.
The heated seat module request circuits are monitored by the HVAC module and will set a DTC if a circuit fault is detected. Refer to the HVAC Module DTC Chart.
Normal heat cycle may require several minutes to initially warm the seat. The seat should be occupied to correctly test for normal operation. Temperature measuring devices do not provide an accurate method for testing heated seat operation as surface temperatures are subject to human and environmental characteristics. Correct testing requires heater mat resistance measurements which have tight tolerances affecting the length of time for the heater mats to reach maximum operating temperature.
Can you show us that for the blower motor?blaine109 said:It was not the blower.
I have one issue solved. A relay under the hood was bad.
My heated/cooled seats are still not working though.
When you push the button, all 3 lights illuminate and then turn off within a second. This happens for both passenger or driver side and for both heated and cooling functions. No clicking noise is heard that you typically hear from the passenger seat when the system is activated.
They are the black plastic blocks in the Battery Junction Box under the hood. They say HI PWR or something like that.JeffsSport said:Can you show us that for the blower motor?blaine109 said:It was not the blower.
I have one issue solved. A relay under the hood was bad.
My heated/cooled seats are still not working though.
When you push the button, all 3 lights illuminate and then turn off within a second. This happens for both passenger or driver side and for both heated and cooling functions. No clicking noise is heard that you typically hear from the passenger seat when the system is activated.
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SHOdded said:Since the blower issue turned out to be a bad relay (yay!), makes sense to verify the Smart Junction Box (SJB) fuse 35 (10A) and Battery Junction Box (BJB) fuse 22 (30A) are OK for climate controlled seats.
Blaine due setup your signature with your current vehicle and any mods you may have,thanks. Zblaine109 said:They are the black plastic blocks in the Battery Junction Box under the hood. They say HI PWR or something like that.JeffsSport said:Can you show us that for the blower motor?blaine109 said:It was not the blower.
I have one issue solved. A relay under the hood was bad.
My heated/cooled seats are still not working though.
When you push the button, all 3 lights illuminate and then turn off within a second. This happens for both passenger or driver side and for both heated and cooling functions. No clicking noise is heard that you typically hear from the passenger seat when the system is activated.
Sent from my DROID RAZR HD using Tapatalk
SHOdded said:Since the blower issue turned out to be a bad relay (yay!), makes sense to verify the Smart Junction Box (SJB) fuse 35 (10A) and Battery Junction Box (BJB) fuse 22 (30A) are OK for climate controlled seats.
BJB fuse 22 is non-existant (just not there at all).
I will have to check the SBJ again when I get a chance, going out of town this weekend but I will report back.