Pacifica V6-3.8L VIN L (2005)
Seat Heater Control Module: Testing and Inspection
Heated Seat Module - Front Seats
In order to obtain conclusive testing of the memory heated seat adjustable pedal module, the Programmable Communications Interface (PCI) data bus
circuit and any components that provide inputs to the module must be checked.
The most reliable, efficient, and accurate means to diagnose the module requires the use of a DRB III(R) scan tool and the proper diagnostic procedures.
The DRB III(R) scan tool can provide vital information to the technician trying to find a problem with the module. Diagnostic logic software is built into
the memory heated seat adjustable pedal module to help the person trying to locate the problem by the most efficient means possible. Anytime a problem
is suspected, a DRB III(R) scan tool should be obtained and used to retrieve any stored fault codes in the memory heated seat adjustable pedal module. If
diagnostic fault codes are present in the module, record them on a piece of paper immediately before proceeding any further. Then, use these fault codes
to identify the problem by verifying the fault code. Example, If the module records "DRIVER SEAT HEAT OUTPUT OPEN" fault, locate the
diagnostic procedure for this code and follow the flow chart until the specific problem is located and resolved. Once the problem is corrected, erase the
stored fault code using the DRB III(R) scan tool and verify correct heated seat system operation. If the heated seat system appears to be functioning
correctly, verify that there are no other stored codes in the module and return the vehicle to service.
If the fault code could not be verified, such as not finding anything wrong when following the diagnostic flow chart, this is a good indication that a
INTERMITTENT problem may be present. You must than attempt to find the intermittent problem, such as moving the heating element within the seat
while testing continuity or wiggling the wire harness's/electrical connectors under the seat while testing continuity. Always, eliminate all other potential
problems before attempting to replace the memory heated seat adjustable pedal module.
PRELIMINARY TEST
Before testing the individual components in the suspect system, check the following:
1. Using the DRB III(R) scan tool, check the memory heated seat adjustable pedal module (MHSAPM) for any stored fault codes. Record these
codes on paper for reference and resolve using the appropriate diagnostic procedures.
2. Check the vehicles battery open-circuit voltage and charging system performance. If the vehicles electrical system is defective or weak it may not
be suppling sufficient voltage to operate the system in question.