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B2375



DTC B1825, B1850, B1860, B2355, B2365, or B2375

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptors
DTC B1825 01
- Seat Recline Position Sensor Circuit Short to Battery

DTC B1825 06
- Seat Recline Position Sensor Circuit Short to Ground or Open

DTC B1825 5A
- Seat Recline Position Sensor Direction of Motion Reversed

DTC B1850 01
- Seat Lumbar Horizontal Position Sensor Circuit Short to Battery

DTC B1850 06
- Seat Lumbar Horizontal Position Sensor Circuit Short to Ground or Open

DTC B1850 5A
- Seat Lumbar Horizontal Position Sensor Direction of Motion Reversed

DTC B2355 01
- Left Front Seat Front Vertical Position Sensor Circuit Short to Battery

DTC B2355 06
- Left Front Seat Front Vertical Position Sensor Circuit Short to Ground or Open

DTC B2355 5A
- Left Front Seat Front Vertical Position Sensor Direction of Motion Reversed

DTC B2365 01
- Left Front Seat Rear Vertical Position Sensor Circuit Short to Battery

DTC B2365 06
- Left Front Seat Rear Vertical Position Sensor Circuit Short to Ground or Open

DTC B2365 5A
- Left Front Seat Rear Vertical Position Sensor Direction of Motion Reversed

DTC B2375 01
- Left Front Seat Assembly Horizontal Position Sensor Circuit Short to Battery

DTC B2375 06
- Left Front Seat Assembly Horizontal Position Sensor Circuit Short to Ground or Open

DTC B2375 5A
- Left Front Seat Assembly Horizontal Position Sensor Direction of Motion Reversed




Diagnostic Fault Information






Circuit/System Description

The position sensor that set 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.


Conditions for Running the DTC

The MSM must be powered.


Conditions for Setting the DTC

B1825, B1850, B2355, B2365, B2375 01

If the MSM sees the analog input from this sensor is greater than 4.75 volts, the sensor will be considered out of range and the MSM will set this DTC.

B1825, B1850, B2355, B2365, B2375 06

If the MSM sees the analog input from this sensor is less than 0.22 volt , the sensor will be considered out of range and the MSM will set this DTC.

B1825, B1850, B2355, B2365, B2375 5A

This DTC will set, if the MSM is controlling a motor in one direction and its position sensor is tracking the motor in the opposite direction. The sensor is either mounted or wired incorrectly, or the polarity of the motor control circuits are reversed.


Action Taken When the DTC Sets

All memory recall and seat massage functions will be disabled.


Conditions for Clearing the DTC

* The current DTC will clear and set to history, when the MSM sees the analog input from the sensor as between 0.22 volt and 4.75 volts and the ignition is cycled OFF then back to ACC or RUN.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.



Diagnostic Aids

* All position sensors use common ground and 5-volt reference circuits.
* If the 5-volt reference circuit is shorted to voltage multiple position sensor codes will set.
* If the 5-volt reference circuit is shorted to ground multiple position sensor codes will set.
* If the sensor ground circuit is open multiple codes will set.
* DTC failure type 5A will set if the sensor setting this DTC is either mounted or wired incorrectly, or the polarity of the motor control circuits are reversed.



Reference Information
Schematic Reference

Driver Seat Schematics (Driver Seat Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Memory Seats Description and Operation (Memory Seats Description and Operation)
* Lumbar Support Description and Operation (w/o Memory - A45) (Lumbar Support Description and Operation (w/o Memory - A45))Lumbar Support Description and Operation (with Memory - A45) (Lumbar Support Description and Operation (with Memory - A45))

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for Scan Tool Information


Circuit/System Verification

Ignition ON, observe the scan tool Driver Seat and Lumbar Position Sensor parameters. The readings should be between 0.22 volt and 4.75 volts and change while adjusting seat and lumbar positions.


Circuit/System Testing


B1825, B2355, B2365, B2375
1. Ignition OFF, disconnect the X2 harness connector at the seat adjuster motor for which the DTC set.
2. Ignition OFF, test for less than 5 ohms of resistance between the appropriate low reference circuit terminal listed below and ground.

* Seat horizontal motor sensor terminal C
* Seat front vertical motor sensor terminal C
* Seat rear vertical motor sensor terminal A
* Seat recline motor sensor terminal 1


• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8-5.2 volts between the appropriate 5-volt reference circuit terminal listed below and ground.

* Seat horizontal motor sensor terminal A
* Seat front vertical motor sensor terminal A
* Seat rear vertical motor sensor terminal C
* Seat recline motor sensor terminal 3


• If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.


• If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

4. Verify the appropriate scan tool Driver Seat Sensor parameter is less than 2 volts.

• If greater than 2 volts, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.


* Seat horizontal position sensor terminal B
* Seat front vertical position sensor terminal B
* Seat rear vertical position sensor terminal B
* Seat recline motor sensor terminal 2

5. Install a 3A fused jumper wire between the appropriate signal circuit terminal and the 5-volt reference circuit terminal listed below. Verify the related scan tool Driver Seat position sensor parameter is greater than 4.75 volts.

* Seat horizontal position sensor terminal A and terminal B
* Seat front vertical position sensor terminal A and terminal B
* Seat rear vertical position sensor terminal B and terminal C
* Seat recline motor sensor terminal 2 and terminal 3


• If less than 4.75 volts, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

6. If all circuits test normal, test or replace the seat adjuster motor.



B1850
1. Ignition OFF, disconnect the X1 harness connector at the lumbar horizontal motor.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.

• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal D and ground.

• If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.


• If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

4. Verify the scan tool Lumbar Sensor parameter is less than 2 volts.

• If greater than 2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3A fused jumper wire between the signal circuit terminal E and the 5-volt reference circuit terminal D. Verify the scan tool Lumbar Sensor parameter is greater than 4.75 volts.

• If less than 4.75 volts, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

6. If all circuits test normal, test or replace the lumbar motor assembly.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Front Seat Recliner Actuator Motor Replacement (Front Seat Recliner Actuator Motor Replacement)
* Control Module References (Programming and Relearning)for memory seat module replacement, setup, and programming


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