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Unread 02-21-2011, 07:11 AM   #1
sw19
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1999 XJ Cherokee 
 
Join Date: Oct 2005
Location: Brooklyn, NY
Posts: 58
Where are the heated seat relay and seat heat interface module

Where exactly are these two components located? The heated seats in my '99 Cherokee Limited stopped working. The lights on the switches all function properly. Green backlights come on. And, the orange lights glow steady. This leads me to believe the problem is in the heated seat relay or the seat heat interface module.
I don't want to start removing/opening stuff that I don't have to to get to these 2 parts. So, if anyone can isolate the exact area it would be greatly appreciated.

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Unread 02-21-2011, 07:31 AM   #2
CJ7-Tim
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2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 21,816
SEAT HEAT INTERFACE MODULE
The Seat Heat Interface Module (SHIM) is an electronic
microprocessor controlled device designed to
operate the electric seat heater elements. The SHIM
is located under the right front seat cushion. Inputs
to the module include the console mounted resistor
multiplexed switch signals, seat cushion temperature
sensors, a relay-switched battery feed, and a ground.
The SHIM outputs are the feed for the seat heating
elements and sensors, and the switch telltale circuits.
The SHIM cannot be repaired and, if faulty or damaged,
it must be replaced.

HEATED SEAT RELAY
The heated seat relay is located under the right
front seat cushion near the SHIM. Ignition and battery
power is fed to the relay, which then provides a
switched battery feed to the SHIM. The heated seat
relay cannot be repaired and, if faulty or damaged, it
must be replaced.

The heated seat system is capable of performing
some self-diagnostics. The following table depicts the
various failure modes which will be reported to the
occupant via flashing the momentary switch telltales.
The switch telltales will flash on the driver’s switch
if the failure exists in the driver’s seat portion of the
system, similarly with the passenger’s switch. The
telltale will illuminate for approximately a 1⁄2 second
on, 1⁄2 second off pulse for a duration of one minute.
This process will repeat every time the system is initiated
via the switches until the problem has been
corrected.
seat.jpg  
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Unread 03-11-2011, 11:45 AM   #3
sw19
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1999 XJ Cherokee 
 
Join Date: Oct 2005
Location: Brooklyn, NY
Posts: 58
Thanks CJ7-Tim. Now, do I need to remove the seat cover or, is it accessible from under the seat?
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Unread 03-11-2011, 02:02 PM   #4
CJ7-Tim
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2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 21,816
I have never seen one myself. I would assume you can physically trace the wire harness and located the modules that way.
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