Question about Jeep Grand Cherokee

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Jeep Grand Cherokee Ltd 1999 3.1 TD. Heated front seats. Lights on the switches are OK. Both in position HI and LOW. However, but no heat in the seats. Where do I start ?

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Hello. The heated seats in your Grand Cherokee actually have several components including the switches, heat elements, sensors and modules. I am including a link to an excellent and complete explanation of the power seats and the heated seats at this link http://www.wjjeeps.com/seats/seats.htm The heated seat information follows the power seat info. Joe

Posted on Apr 23, 2010

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Heated seats on jeep grand cherokee dont work, no dash light


you need new heaters. I've replaced dozens on that model.

Mar 25, 2013 | 1998 Jeep Grand Cherokee

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Heated seats do not work


First off, I would contact your local Jeep dealer and have them run your VIN # to check for any recalls. The 1999-2004 Grand Cherokees had a recall on the seat heaters. If your vehicle doesn't fall into the VIN # range then either your seat heater switch has gone out, or you have a broken element in the seat heater. I have replaced more seat heaters than switchsm the elements heat up and break. Hope this helps out.

Best of luck

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2002 jeep grand cherokee heated seat quit working only the driver side passenger side still works


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Feb 28, 2010 | 2002 Jeep Grand Cherokee

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My right side heated seat not working in 2001 jeep grand cherokee ltd light on switch is on is there a fuse somewhere for it left side works


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Feb 09, 2010 | 2001 Jeep Grand Cherokee

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Jul 21, 2009 | 1998 Jeep Grand Cherokee

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2002 Grand Cherokee Heated Seats don't work


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
  • Heated seat elements
  • Heated seat sensors
  • Heated seat module (or memory heated seat module)
  • Heated seat switches.
The heated seat system also relies upon resources shared with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus network. The PCI data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability enhanced diagnostics, and allows the addition of many new feature capabilities. For diagnosis of these electronic modules or of the PCI data bus network, the use of a DRB scan tool and the proper Diagnostic Procedures are recommended.

The electronic modules that may affect heated seat system operation are as follows:
  • Body Control Module (BCM) - Refer to Body Control Module in Electronic Control Modules for more information.
  • Heated Seat Module (HSM) - Refer to Heated Seat Module in Electronic Control Modules for more information.
  • Memory Heated Seat Module (MHSM) - If the vehicle is equipped with the Memory System, refer to Memory Seat Module in Electronic Control Modules for more information.
Refer to Power Seats Premium I/III in the Contents of Wiring Diagrams for complete circuit diagrams. Following are general descriptions of the major components in the heated seat system.

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

Jan 31, 2009 | 2002 Jeep Grand Cherokee

1 Answer

1999 Jeep Gr. Cherokee Limited, front seats not heating up.


I have a 2002 Grand Cherokee Special Edition and the same thing happened to my heated seats. The light would come on but the seat would not heat up. In my case the Heating element burned out and needed to be replaced. I got it fixed at the dealer and they said this was common and earlier models had a recall on it. You should contact your dealer and see if your year had a recall for it. It was not too bad, about 300 bucks. For an hour work.

Jan 16, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Heater seats dont work but light comes on.


Ok it is obvious since the light is coming on you are getting power to the switch. It could be a heated seat relay. Im fairly sure jeeps use a relay after the switch that is where I would start. Check and see if the Heated seat relay, and fuse are good

Dec 11, 2008 | 2001 Jeep Grand Cherokee

1 Answer

Rear wiper and heated seats not working.


For the heated seats it is usually an open element in the lower seat portion. Time to get in there with a multimeter to see that you have voltage applied at seat connector (when switched on). Then look for continuity in the seat element itself with ohmmeter. Expect resistance to be very low.

Nov 24, 2008 | 1996 Jeep Grand Cherokee

2 Answers

Heated seats are not working but light is on


Sounds like the same problem I had. I brought it to the Jeep dealer and they told me that the heating element in the seat stopped working. They told me that the only way to repair was to take the seat apart and replace the heating element in the seat. Of course they will charge you the standard $80 to tell you this. and then quote you $500 plus to repair. I can't even remember how much, I have decided it was not worth it.
Also this website could help you:
http://www.wjjeeps.com/seats/seats.htm

Oct 31, 2008 | 2001 Jeep Grand Cherokee

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