B2105

DTC B2105

CIRCUIT DESCRIPTION
The position sensor that sets this diagnostic trouble code (DTC) is either attached to the seat directional 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 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.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
DTC B1825 01: Driver Seat Recline Position Sensor Circuit Short to Battery
DTC B1825 06: Driver Seat Recline Position Sensor Circuit Short to Ground or Open
DTC B1850 01: Driver Seat Lumbar Horizontal Position Sensor Circuit Short to Battery
DTC B1850 06: Driver Seat Lumbar Horizontal Position Sensor Circuit Short to Ground or Open
DTC B1860 01: Driver Seat Lumbar Vertical Position Sensor Circuit Short to Battery
DTC B1860 06: Driver Seat Lumbar Vertical Position Sensor Circuit Short to Ground or Open
DTC B2105 01: Front Passenger Seat Lumbar Vertical Position Sensor Circuit Short to Battery
DTC B2105 06: Front Passenger Seat Lumbar Vertical Position Sensor Circuit Short to Ground or Open
DTC B2355 01: Driver Seat Front Vertical Position Sensor Circuit Short to Battery
DTC B2355 06: Driver Seat Front Vertical Position Sensor Circuit Short to Ground or Open
DTC B2365 01: Driver Seat Rear Vertical Position Sensor Circuit Short to Battery
DTC B2365 06: Driver Seat Rear Vertical Position Sensor Circuit Short to Ground or Open
DTC B2375 01: Driver Seat Assembly Horizontal Position Sensor Circuit Short to Battery
DTC B2375 06: Driver Seat Assembly Horizontal Position Sensor Circuit Short to Ground or Open

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 less than 0.25 volt or greater than 4.75 volts, 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 it sees the analog input from this sensor as between 0.25 volt and 4.75 volts during one cycle of checking the MSM inputs.

DIAGNOSTIC AIDS
- The scan tool references the MSM as the driver position module (DPM).
- All position sensors use common ground and 5-volt reference circuits.
- If the 5-volt reference circuit is shorted to voltage multiple codes will set.
- If the 5-volt reference circuit is shorted to ground multiple codes will set.
- If the sensor ground circuit is open multiple codes will set.

TEST DESCRIPTION

Step 1 - Step 10:

Step 11 - Step 16:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for the proper operation of the circuit in the low voltage range.
4. This step tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
5. This step tests for a short to voltage in the 5-volt reference circuit.
6. This step tests for a high resistance or an open in the ground circuit.
16. This step verifies the repair.