Question about Cars & Trucks
All the heated seats in my car not working ,the fuse is good and switch has power all of them what could be the the problem
Timer/relay not working heater element bad..check with a meter..or test light.
Posted on Dec 26, 2013
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Posted on Jan 02, 2017
I will post it in 2 different posts because its too long DB
HEATED SEAT SYSTEM
Individually controlled driver and passenger side electrically heated front seats are available factoryinstalled optional equipment on this model, when it is also equipped with the power seat option. The heated seat system allows both the driver and the front seat passenger the option to select one of two seat heating ranges, Low or High, or to turn the individual seat heaters OFF using the heated seat switches located in the center lower bezel near the bottom of the instrument panel center stack. The heated seat switch circuit operates on ignition switched battery current supplied through a fuse in the junction block, only when the ignition switch is in the ON position.
The heated seat system consists of the following components
The electronic modules that may affect heated seat system operation are as follows:
The heated seat system will only operate when the ignition switch is in the ON position, and the surface temperature at the front seat heating element sensors is below the designed temperature set points of the system. The heated seat system will not operate in ambient temperatures greater than about 41 °C (105 °F) . The front seat heating elements and sensors are hard wired to the Heated Seat Module (HSM) or the Memory Heated Seat Module (MHSM).
The heated seat switches are hard wired to the Body Control Module (BCM). The BCM monitors the heated seat switch inputs, then sends heated seat switch status messages to the HSM or MHSM over the Programmable Communications Interface (PCI) data bus. The HSM or MHSM contains the control logic for the heated seat system. The HSM or MHSM responds to the heated seat switch status messages, ignition switch status messages, and the front seat heating element sensor inputs by controlling the output to the front seat heating elements through integral solid-state relays.
When a seat heater is turned ON, the sensor located on the seat cushion electric heater element provides the HSM or MHSM with an input indicating the surface temperature of the seat cushion. If the surface temperature input is below the temperature set point for the selected Low or High heated seat switch position, the HSM or MHSM energizes the integral solid-state relay, which supplies battery current to the heating elements in the seat cushion and back. When the sensor input indicates the correct temperature set point has been achieved, the HSM or MHSM de-energizes the solid-state relay. The HSM or MHSM will continue to cycle the solid-state relay as needed to maintain the temperature set point.
The HSM or MHSM and the seat heater elements operate on non-switched battery current supplied through the power seat circuit breaker in the junction block. However, the HSM or MHSM will automatically turn OFF the heating elements if it detects an open or short in the sensor circuit, a short or open in the heating element circuit causing an excessive current draw, or when the ignition switch is turned to the OFF position.
See the owner's manual in the vehicle glove box for more information on the features, use and operation of the heated seat system.
I WILL POST THE REST
Posted on Feb 03, 2009
Page 43 in the document linked to below is a wiring diagram of the heated seats in an 850. If you're lucky some wires have come loose and are hanging under the seats, if you're unlucky you might have to do some shredding of the seats in order to replace broken parts. If so there is a fairly inexpensive repair kit made specifically for this purpose, but I don't have the part number available right now. Arm yourself with a multimeter and get to it!
Posted on May 30, 2009
if the light doesnt come on for the heated seat, *sometimes* the electronics need to be reset. You do this by very carefully taking both battery poles off the battery entirely. Then touching the negative to the positive WHILE NEITHER IS TOUCHING THE BATTERY (this is very important otherwise you could get shocked). This will clear computer and reset it. Then reconnect the positive first. then the negative. this will sometimes work. This is only if the light for the heated seats is not coming on. If the light is coming on you probably need a new heater core.
Posted on Mar 04, 2010
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