B2355
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 voltage greater than 5 V 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
* With a short to ground or an open circuit, 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 position commands.
* With a short to battery voltage, the seat memory control module disables the memory recall and easy exit/entry action commands for all four seat motors. The motors will respond to manual position 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 Sunshade - Left (DH6)
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 Control Module References 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.
3. Test for greater than 10.8 V between the 12 V reference circuit terminal 4 and ground.
• If 10.8 V or less
1. Ignition OFF, disconnect the X1 harness connector at the K40 seat memory control module.
2. Test for infinite resistance between the 12 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the 12 V reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K40 seat memory control module.
• If greater than 10.8 V
4. Test for 0.3-2 V between the signal circuit terminal 2 and ground.
• If 0.3 V or less
1. Ignition OFF, disconnect the X1 harness connector at the K40 seat memory control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K40 seat memory control module.
• If greater than 2 V
1. Ignition OFF, disconnect the X1 harness connector at the K40 seat memory control module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K40 seat memory control module.
• If between 0.3-2 V
5. Test or replace the seat motor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* 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
* Driver or Passenger Seat Recliner Actuator Replacement Driver or Passenger Seat Recliner Actuator Replacement
* Control Module References Control Module References for seat memory control module replacement, programming and setup