Pacifica V6-3.8L VIN L (2005)
Power Seat Motor: Testing and Inspection
Lumbar Motor
The most reliable, efficient, and accurate means to diagnose the power seat system requires the use of a DRB III(R) scan tool and the proper Diagnostic
Procedures information. The DRB III(R) scan tool can provide confirmation that the PCI data bus is functional, that the electronic modules are sending
and receiving the proper messages on the PCI data bus network, and that the power seat system is receiving the proper hard wired inputs and relaying the
proper hard wired outputs to perform system functions.
Following are tests that will help to diagnose the components and circuits in the power seat system. However, these tests may not prove conclusive. In
order to obtain conclusive testing of the power seat system, the Programmable Communications Interface (PCI) data bus network must be checked.
PRELIMINARY TESTS
1. Obtain a DRB III(R)scan tool and check for any stored diagnostic codes recorded in the memory heated seat adjustable pedal module. Follow the
procedures called out in the proper diagnostic procedures to resolve if codes are present.
1. If any power seat is not operational in any direction, check the power seat circuit breaker, located in the Integrated Power Module. If OK, go to
Step 2. Refer to the Power Distribution for circuit breaker diagnosis and testing procedure.
2. Check for proper battery or electrical system voltage. The CS is equipped with a low-voltage cutoff feature. If the electrical system voltage drops
below a predetermined set-point (approx. 11.5v), the power seat system will not function until the proper system voltage has been restored. If OK,
go to Step 4. Refer to the Battery System and/or Charging System for testing instructions.
3. Obtain a DRB III(R) scan tool and energize each seat track motor axis one at a time. If any axis stops without hitting the end of travel, the
potentiometer signal for that axis may have an open, short or be mis-wired. Check the wiring to that axis (module to motor). Fix any wiring
problems and retry that axis. If a lumbar motor is inoperational, apply 12v and a good ground source to the inop motor. If the motor does not
operate in either direction replace the power lumbar assembly. Refer to Wiring for complete circuit diagrams.