Here is a heated seat TSB for cars built prior to 12/14/07
TSB 09-4-8
03/09/09
INOPERATIVE HEATED SEAT(S) - BUILT
BEFORE 12/14/2007
FORD:
2005-2007 Five Hundred, Freestyle
2008 Taurus X, Taurus
MERCURY:
2005-2007 Montego
2008 Sable
ISSUE
Some
2005-2007 Freestyle, Five Hundred, Montego and 2008 Taurus, Sable and
Taurus X vehicles built before 12/14/2007 may exhibit an inoperative
heated seat(s). This concern may be caused by an intermittent open
element in the heated seat mat.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
The
heated seat system is controlled by the heated seat module located
underneath the front passenger seat cushion. The heated seat switches
are part of the heating ventilation air conditioning (HVAC) module but
the heated seat system operates independently from the climate control
system. The heated seat module regulates seat temperature by monitoring
resistance of a thermistor type thermostat located in the cushion heater
mat. The heated seat module is designed to remain on, heating the seat
and maintaining temperature until switched off. For vehicles built
before 5/1/2006, the module will time-out and switch off after 10
minutes.
1. Refer to Workshop Manual (WSM), Section 501-10 for pin point test on inoperative heated seat(s).
a.
When testing the heater mats resistance and circuits for an
intermittent open, technicians should sit in the seat while testing the
circuit resistance, move the seat in multiple seating positions and
apply pressure to several areas of the heated seat mat to ensure the mat
element is not open intermittently.
2. Refer to WSM 501-10 for heated seat element replacement when an open electrical circuit has been identified.
Parts Block
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT
: Warranty coverage limits/policies are not altered by a TSB. Warranty
coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
MT090408 Use SLTS Operations If Actual
Available Or Labor Time
Performed As Actual Time
DEALER CODING
CONDITION
BASIC PART NO. CODE
14D696 28
I hope this helps to solve it.
SOURCE: 03 chevy tahoe
There are seperate blowers for the front and rear air. It is most likely either your blower motor or the resistor, both located under the passenger side dash. I got a blower from a salvage yard for $25, But ended up having to get the resister from the dealership for about $130. Hope this helps.
SOURCE: Our Driver Seat Heaters and passenger seat will turn on for 2 sec
When this was happening on my Envoy it ended up being the seat heaters control module that was going out. About $600 a seat on mine. Just wish my repair center found that out before they replaced the seat heaters twice.
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