B2120

CIRCUIT DESCRIPTION
The position sensor that sets this diagnostic trouble code (DTC) is either attached to the seat motor drive cable or directly to the motor it monitors. It receives a 5 volt reference and ground from the memory seat module (MSM). The sensor also has a analog output signal that is wired directly to the MSM. The sensor sends a voltage signal that varies with the movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.

CONDITIONS FOR RUNNING THE DTC
The MSM must be powered and can not have B1327 - Battery Voltage Low set as an active DTC for this DTC to set.

CONDITIONS FOR SETTING THE DTC
If the MSM sees the analog input from this sensor as either lower than 0.25 V or higher than 4.75 V, the sensor will be considered out of range and the MSM will set this DTC.

ACTION TAKEN WHEN THE DTC SETS
The MSM disables the memory recall and easy exit/entry action commands of the motor monitored by the sensor. The motor will respond to manual positioning commands.

CONDITIONS FOR CLEARING THE DTC
The MSM will clear the DTC as an active malfunction when the MSM sees the analog input from this sensor as between 0.25 V and 4.75 V during one cycle of checking the MSM inputs.

DIAGNOSTIC AIDS
The position sensors use a common 5 volt reference circuit and a common sensor low reference circuit.

TEST DESCRIPTION

Steps 1-6:

Steps 7-14:

The numbers below refer to the step numbers on the diagnostic table.
2. This tests checks for proper reference voltage to the suspect position sensor.