B2375
DTC B1825, 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
- Driver Seat Recline Position Sensor Circuit Short to Battery
DTC B1825 06
- Driver Seat Recline Position Sensor Circuit Low Voltage/Open
DTC B2355 01
- Driver Seat Front Vertical Position Sensor Circuit Short to Battery
DTC B2355 06
- Driver Seat Front Vertical Position Sensor Circuit Low Voltage/Open
DTC B2365 01
- Driver Seat Rear Vertical Position Sensor Circuit Short to Battery
DTC B2365 06
- Driver Seat Rear Vertical Position Sensor Circuit Low Voltage/Open
DTC B2375 01
- Driver Seat Assembly Horizontal Position Sensor Circuit Short to Battery
DTC B2375 06
- Driver Seat Assembly Horizontal Position Sensor Circuit Low Voltage/Open
Diagnostic Fault Information
Circuit Description
The seat memory control module monitors the position of the seat motors by using hall effect position sensors which are an internal part of each motor. The module supplies each sensor with a 12 V reference circuit and a low side signal circuit. During seat motor operation, the hall effect position sensor provides a determined number of pulse signals for every revolution of the motor shaft. The scan tool displays these pulse signals as counts that range from 0 - 65,535. The module counts the feedback pulses from each sensor to determine seat position and end of travel limits for each of the seat motors. High scan tool count values indicate forward or upward seat positions while low count values indicate rearward or downward seat positions.
Conditions for Running the DTC
* DTC B1325 must not be present.
* Module battery voltage must be between 9 - 16 V.
Conditions for Setting the DTC
The seat memory control module does not detect position sensor movement or pulse signals while the adjuster motor is active. The following conditions will set this DTC:
B1825 01, B2355 01, B2365 01, or B2375 01
The seat memory control module detects a short to battery on the sensor signal circuit.
B1825 06, B2355 06, B2365 06, or B2375 06
The seat memory control module detects a short to ground or an open on the sensor signal circuit.
Action Taken When the DTC Sets
The seat memory control module 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 clears when the fault is no longer present and the power mode changes to OFF then back to ACC or RUN.
* The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.
Reference Information
Schematic Reference
Driver Seat Schematics (Driver Seat Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Memory Seats Description and Operation (Memory Seats)
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 Testing
1. Ignition OFF, disconnect the harness connector at the appropriate driver seat motor listed below for which the DTC set:
* M50 seat front vertical motor
* M55 seat rear vertical motor
* M51 seat horizontal motor
* M56 seat back recline motor
2. Ignition ON, test for B+ between the 12 V reference circuit terminal 4 and ground.
• If less than the specified value, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 seat memory control module.
3. Test for 0.3 - 2 V between the signal circuit terminal 2 and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 seat memory control module.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K40 seat memory control module.
4. If all circuits test normal, replace the seat motor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Cushion Frame Replacement (Driver or Passenger Seat Cushion Frame Replacement)
* Control Module References (Programming and Relearning) for seat memory control module replacement, setup, and programming