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B2355




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

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) 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 Circuit Plausibility Failure

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

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

DTC B1850 5A
- Left Front Seat Lumbar Horizontal Position Sensor Circuit Plausibility Failure

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

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

DTC B2355 5A
- Left Seat Front Vertical Position Sensor Circuit Plausibility Failure

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

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

DTC B2365 5A
- Left Seat Rear Vertical Position Sensor Circuit Plausibility Failure

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

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

DTC B2375 5A
- Left Seat Assembly Horizontal Position Sensor Circuit Plausibility Failure

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 V reference and low reference 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 01, B1850 01, B2355 01, B2365 01, or B2375 01

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

B1825 06, B1850 06, B2355 06, B2365 06, or B2375 06

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

B1825 5A, B1850 5A, B2355 5A, B2365 5A, or 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

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 current DTC will clear and set to history, when the MSM sees the analog input from the sensor as between 0.22 V and 4.75 V 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 V reference circuits.
* If the 5 V reference circuit is shorted to voltage multiple position sensor codes will set.
* If the 5 V 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 5 A 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)
* Lumbar Support Description and Operation (Without Memory-A45) (Lumbar Support Description and Operation (Without Memory-A45))Lumbar Support Description and Operation (With Memory-A45) (Lumbar Support Description and Operation (With Memory-A45))

Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Memory Seat Module driver seat and lumbar position sensor parameters. The readings should be between 0.22 V and 4.75 V and change while adjusting seat and lumbar positions.

Circuit/System Testing

B1825 01 or B1825 06
1. Ignition OFF, disconnect the X2 harness connector at the seat recline motor.
2. Test for less than 2 Ohms between the appropriate low reference circuit terminal listed below and ground:

* Terminal 1 (LHD)
* Terminal 3 (RHD)

• If greater than the specified range, 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 V between the appropriate 5 V reference circuit terminal listed below and ground:

* Terminal 3 (LHD)
* Terminal 1 (RHD)

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

4. Verify the scan tool Driver Seat Recline Sensor parameter is less than 1.0 V.

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

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the appropriate 5 V reference circuit terminal listed below. Verify the scan tool Driver Seat Recline Sensor parameter is greater than 4.75 V.

* Terminal 3 (LHD)
* Terminal 1 (RHD)

• If less than the specified range, 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 recline position sensor.

B2355 01, B2355 06, B2365 01, B2365 06, B2375 01 or B2375 06
1. Ignition OFF, disconnect the X2 harness connector at the appropriate seat adjuster motor.
2. Test for less than 2 Ohms between the appropriate low reference circuit listed below and ground.

* Seat horizontal motor sensor terminal C
* Seat front vertical motor sensor terminal C LHD)
* Seat front vertical motor sensor terminal A RHD)
* Seat rear vertical motor sensor terminal A (LHD)
* Seat rear vertical motor sensor terminal C (RHD)

• If greater than the specified range, 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 V between the appropriate 5 V reference circuit terminal listed below and ground.

* Seat horizontal motor sensor terminal A
* Seat front vertical motor sensor terminal A (LHD)
* Seat front vertical motor sensor terminal C (RHD)
* Seat rear vertical motor sensor terminal C (LHD)
* Seat rear vertical motor sensor terminal A (RHD)

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

• If greater than the specified range, test the 5 V 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 1.0 V.

• If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3 A fused jumper wire between the appropriate signal circuit terminal and 5 V reference circuit terminal listed below. Verify the appropriate scan tool driver seat position sensor parameter is greater than 4.75 V.

* Seat horizontal position sensor terminal B and terminal A
* Seat front vertical position sensor terminal B and terminal A (LHD)
* Seat front vertical position sensor terminal B and terminal C (RHD)
* Seat rear vertical position sensor terminal B and terminal C (LHD)
* Seat rear vertical position sensor terminal B and terminal A (RHD)

• If less than the specified range, 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 appropriate seat position sensor.

B1850 01 or B1850 06
1. Ignition OFF, disconnect the harness connector at the lumbar motor.
2. Test for less than 2 Ohms between the appropriate low reference circuit terminal listed below and ground:

* Terminal C (LHD)
* Terminal D (RHD)

• If greater than the specified range, 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 V between the appropriate 5 V reference circuit terminal listed below and ground:

* Terminal D (LHD)
* Terminal C (RHD)

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
• If greater than the specified range, test the 5 V 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 1.0 V.

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

5. Install a 3 A fused jumper wire between the signal circuit terminal E and the appropriate 5 V reference circuit terminal listed below. Verify the scan tool Lumbar Sensor parameter is greater than 4.75 V.

* Terminal D (LHD)
* Terminal C (RHD)

• If less than the specified range, 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 position sensor.

Repair Instructions

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

* Front Seat Tilt Adjuster Actuator Replacement (Front Seat Tilt Adjuster Actuator Replacement)
* Front Seat Adjuster Actuator Replacement (Front Seat Adjuster Actuator Replacement)
* Driver Seat Outer Adjuster Rear Vertical Actuator Replacement (Driver Seat Outer Adjuster Rear Vertical Actuator Replacement)
* Front Seat Recliner Actuator Motor Replacement (Front Seat Recliner Actuator Motor Replacement)
* Seat Lumbar Sub System Replacement (without AHS) (Seat Lumbar Sub System Replacement (Without AHS))Seat Lumbar Sub System Replacement (with AHS) (Seat Lumbar Sub System Replacement (With AHS))
* Control Module References (Programming and Relearning) for MSM replacement, setup, and programming

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