B2355 Driver Front Vertical Sensor Malf (A45 With AL2)

DTC B2355 Driver Front Vertical Sensor Malf (A45 With AL2):

DTC B2355 Driver Front Vertical Sensor Malf (A45 With AL2) (Part 1 Of 2):

DTC B2355 Driver Front Vertical Sensor Malf (A45 With AL2) (Part 2 Of 2):

CIRCUIT DESCRIPTION
The Memory Seat Module (MSM) receives inputs from the seat headrest position sensor during memory recall and memory set functions. The potentiometer in the position sensor varies in resistance as the motor moves the headrest up and down. The MSM receives a variable voltage input depending on the resistance of the potentiometer. During memory set, the MSM records the voltage across the seat headrest potentiometer. During memory recall, the MSM moves the seat headrest motor until the voltage across the potentiometer matches the voltages stored in memory. The headrest is not moved during the easy exit function. During normal operation, the seat headrest position sensor is checked against out-of-range voltage limits.

CONDITIONS FOR SETTING DTC
^ The MSM will set the DTC B1900 any time it detects that the seat headrest sensor input voltage is out of range (less than 0.25 volts or greater than 4.75 volts).
^ DTC B1900 will set only if DTC B1327 MSM or DTC B1328 MSM is not current.

ACTION TAKEN WHEN THE DTC SETS
When DTC B1900 is set as current, the Memory Seat Module (MSM) will disable the seat headrest motor during memory recall operation. The seat headrest motor will remain enabled for manual positioning.

CONDITIONS FOR CLEARING DTC
^ The MSM detects that the seat headrest 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.