Memory System

MEMORY SYSTEM

The most reliable, efficient, and accurate means to diagnose the memory system requires the use of a diagnostic scan tool and the proper Diagnostic Procedures Information. In order to obtain conclusive testing of the memory system, the Programmable Communications Interface (PCI) data bus network and all of the electronic modules that provide inputs to, or receive outputs from the memory system components must be checked. The diagnostic scan tool can provide confirmation that the PCI data bus is functional, that all of the electronic modules are sending and receiving the proper messages on the PCI data bus, and that the memory system is receiving the proper hard wired inputs and relaying the proper hard wired outputs to perform its functions. The scan tool is used to retrieve any diagnostic trouble codes (DTC's) that could be related to the memory system.

Following are tests that will help to diagnose the hard wired components and circuits of the memory system.

PRELIMINARY TESTS

1. If either power seat is not operational in all directions, check the power seat circuit breaker, located in the Integrated Power Module (IPM). If OK, go to STEP 2. If not OK check the circuit for shorts and repair the circuit/circuit breaker as needed.
2. Check for proper battery or electrical system voltage. The vehicle is equipped with a low-voltage cut-off 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 3. Refer to the Battery System and/or Charging System for testing instructions if battery voltage is below 11.5v.Testing and Inspection, Testing and Inspection
3. Obtain a diagnostic scan tool and check for any stored diagnostic trouble codes recorded in the Memory Heated Seat Adjustable Pedal Module (MHSAPM). Follow the procedures called out in the proper Diagnostic Procedures Information to resolve if codes are present.
4. Using a diagnostic scan tool, 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.