B2120

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The sensor that sets this diagnostic trouble code (DTC) is attached to the seat direction motor it monitors. The sensor is a potentiometer whose supply and ground are portions of the sensor 5 V supply bus and the ground bus provided by the memory seat module (MSM). The sensor analog output signal is wired directly to the MSM. The MSM checks the signal to determine seat motor position.

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 during one cycle of checking the MSM inputs, the MSM sets this DTC.

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

TEST DESCRIPTION
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.