SAAB WIS ONLINE

DTC B1825, B2355, B2365, or B2375

DTC B1825, B2355, B2365, or B2375

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

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 Short to Ground Open/High Resistance Short to Voltage Signal Performance
12 V Reference

B1825 06, B2355 06, B2365 06, B2375 06

B1825 06, B2355 06, B2365 06, B2375 06

B1825 01, B2355 01, B2365 01, B2375 01

-

Driver Seat Front Vertical Position Sensor Signal

B2355 06

B2355 06

B2355 01

-

Driver Seat Rear Vertical Position Sensor Signal

B2365 06

B2365 06

B2365 01

-

Driver Seat Horizontal Position Sensor Signal

B2375 06

B2375 06

B2375 01

-

Driver Seat Recline Position Sensor Signal

B1825 06

B1825 06

B1825 01

-



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

Connector End View Reference

Component Connector End Views

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


Scan Tool Reference

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, test for B+ between the 12 V reference circuit terminal 4 and ground.

3. 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.

4. Test for 0.3 - 2 V between the signal circuit terminal 2 and ground.

5. 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 K40 seat memory control module.

6. 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.

7. If all circuits test normal, replace the seat motor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Front Seat Recliner Actuator Motor Replacement (Driver or Passenger Seat 8-Way Power)

Front Seat Adjuster Motor Replacement (Driver or Passenger Seat 8-Way Power)

Control Module References for seat memory control module replacement, setup, and programming