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
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