B2118

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Circuit Description

The memory seat module (MSM) receives inputs from the front vertical position sensor during the following functions:

^ Memory recall
^ Memory set
^ Easy exit

The potentiometer in the position sensor varies in resistance as the motor tilts the front of the seat. The MSM receives a variable voltage input depending on the resistance of the potentiometer.

During memory set, the MSM records the voltage across the front vertical potentiometer.

During memory recall, the MSM moves the front vertical motor until the voltage across the potentiometer matches the voltages stored in memory.

For the easy exit function, the MSM moves the front vertical motor until the voltage matches the information that the MSM has recorded in memory for the easy exit.

During normal operation, the front vertical position sensor is checked against out-of-range voltage limits.

Conditions for Setting the DTC

^ The MSM sets the DTC B2118 any time the MSM detects that the front vertical sensor input voltage is out of range (less than 0.25 volts or greater than 4.75 volts).
^ DTC B2118 sets only if DTC B1982 MSM or DTC B1983 MSM is not current.

Action Taken When the DTC Sets

When DTC B2118 is set as current the Memory Seat Module (MSM) disables the front vertical motor during memory recall or easy exit operations. The front vertical motor remains enabled for manual positioning.

Conditions for Clearing the DTC

^ The MSM detects that the front vertical position sensor input is within the valid voltage range.
^ Use the on-boards clearing DTCs feature.
^ Use a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

1. Perform the Power Seat Systems Diagnostic System Check before continuing with the diagnosis of this DTC.
2. Multiple position sensor DTCs set indicates a concern with the reference wiring or memory seat module (MSM). Only one position sensor DTC set indicates a concern with the position sensor and wiring.
21. Clear all DTCs after the repair procedure is complete.