Question about Ford Cars & Trucks
This system allows independent seat electrical heating of each front seat on demand.
The components of the system are:
Climate Controlled Seats
The climate control seat system is able to heat and cool the front seats. Each climate controlled seat is operated by push-buttons on the electronic automatic temperature control (EATC) module located on the instrument panel. Each front seat temperature is then monitored and controlled by the climate control seat module (CCSM) located on the front passenger seat track.
The climate controlled seat system contains the following components:
NOTE: The high speed controller area network (HS-CAN) circuits that pass through the passenger seat harness are part of the main HS-CAN LOOP. If the front passenger seat-to-floor connectors are disconnected, a NO START condition will result.
NOTE: The medium speed controller area network (MS-CAN) circuits that pass through the driver seat harness are part of the main MS-CAN LOOP. If the front driver seat-to-floor connectors are disconnected, various MS-CAN modules will not be able to communicate.
The front seats can be equipped with the following systems:
Driver Seat Module - Memory Seat
The power driver seat, power outside rear view mirrors and power adjustable pedals are controlled by the driver seat module (DSM) only when the vehicle is equipped with the programmable/recall memory option. The DSM is located on the driver seat track.
This system allows automatic positioning of the driver seat to 2 programmable positions.
Driver and Passenger Power Seats Without Memory
The driver and front passenger power seat motors are hardwired to the seat control switches on each respective seat. The circuits are normally at ground through the seat control switch. Each individual seat track, recliner (if equipped) and lumbar (if equipped) motor circuit is switched to power when the specific adjustment position is selected.
Power Driver Seat With Memory
The driver power seat is controlled by the driver seat module (DSM), if equipped. The memory driver seat feature allows the driver to program a personalized seat position that can be recalled using the memory switch or a remote keyless entry (RKE) transmitter. There are 2 memory settings possible. The outside rear view mirror positions are also stored and recalled with the power driver seat positions.
The DSM is located underneath the driver seat cushion frame. The DSM does not require calibration to the driver seat track.
The driver seat control switch provides voltage to the DSM when activated. The NEUTRAL position of each driver seat control switch position is a ground state through the seat control switch contacts. A voltage input causes the DSM to power the appropriate motor until the input is removed. Ground is the normal state of the motor circuits through the DSM and is not switched to control the motors. The DSM internally switches the appropriate circuit from ground to power for operating the motors.
As the seat is adjusted, the DSM constantly monitors the motor position sensors to record the current seat position. The DSM will remove power from the motor upon termination of the seat control switch input or if the DSM does not see movement from the motor by monitoring the position sensor.
The DSM communicates diagnostic trouble code (DTC) and other information using the MS-CAN communication bus. It should be noted for diagnostics that because CAN bus communication is more robust and reliable than other methods, it may be possible to have limited module communication with one of the CAN bus circuits disconnected or shorted to ground. Refer to Section 418-00 for information concerning MS-CAN bus communication.
Taking the vehicle to a qualified repair shop an having a diagnostic scan of the seat module's done could save time an money , by not replacing parts needlessly .
Posted on Jul 17, 2018
Id bet the relay is welded shut and thats why it wont turn off. find the relay and replace it.
Posted on Jul 17, 2018
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Posted on Jan 02, 2017
SOURCE: heated driver seat problem
I just repaired one not long ago.It was a 2001 with heated seats.The first thing you can do is switch the switches to see if the problem moves to the other seat.There are at least three little heaters attached to the foam,that is bonded to the leather.One had a broken wire,the other two [that I know of in the base] tested good.Seems they all have to be working,so everyone must be tested for continuity,with out being pluged in to the others.The only way to see whats going on is to somewhat remove the leather from the seat. With extreme care I was able to get more wire out of the heater and soldier it back on.Then used silicone or 3m window welder around[I don't remember wich] to protect it as that is how it kind of it from the factory. It looked like the wire broke at the edge of the protective part due to sitting on the seat too many times. Bad design,to hold up over time.
Posted on Mar 12, 2009
SOURCE: Heated seat
It is the heatling element, stock elements have a single wire snaked through the element and when the circuit breaks it is done, aftermarket elements have a wired grid that if one area fails it still works, they also spread a more even heat.
Posted on Oct 09, 2009
I have a similar problem with a couple extras. I locked the keys in the truck and used my keyless entry pad on the door to unlock. When the lock (knob) popped up, I heard a noise. That's when the driver seat quit heating AND the lock button on the driver's side door will only unlock. It will not lock. The passenger side works fine. Could this be a fuse? Or electric?
Posted on Oct 27, 2009
SOURCE: Heated Seats
I had the same problem on my 04 LeSabre. To check to see whether it was the element or the switch, I unplugged both seats and ran jumper wires to make left switch control the right element. The switch and element worked properly. Then I ran jumper wires to make right switch control the left element. The problem was the same, so it was the element was bad.
I had my element replaced at the dealership, since I didn't want to wreck my leather seats. It cost over $400 (about $150 for the element). I guess it just tucks next to the old element - the old element stays in place.
Posted on Nov 28, 2009
See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they dont; work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue.
Posted on Dec 11, 2009
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