B2375
DTC B1825, B1850, 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 B2355
- Driver Seat Front Vertical Position Sensor Circuit
DTC B2365
- Driver Seat Rear Vertical Position Sensor Circuit
DTC B2375
- Driver Seat Horizontal Position Sensor Circuit
Diagnostic Fault Information
Circuit/System Description
The front vertical, rear vertical, and horizontal seat position sensors are potentiometers that are either attached directly to the motor transmission cable or are an internal part of the motor. The memory seat module (MSM) supplies a 5 V reference voltage through the 5 V reference circuit and ground through the low reference circuit to the respective seat position sensors. When the motor or cable rotates, the resistance of the potentiometer varies changing the feedback voltage of the position sensor signal circuit. The MSM monitors this voltage signal to determine the position of the seat. When the MSM detects that one of the seat position sensor signal circuits is out of the voltage range of 0.25-4.75 V, a DTC will be set for that signal circuit.
Conditions for Running the DTC
* DTC B1327 must not be present.
* Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
B2355, B2365, or B2375
If the MSM detects the analog input from this sensor is less than 0.25 V or greater than 4.75 V, the sensor will be considered out of range and the MSM will set the appropriate DTC.
Actions Taken When the DTC Sets
The motor associated with the fault will be disabled for memory functions.
Conditions for Clearing the DTCs
* The condition responsible for setting the DTC no longer exists.
* The history DTC will clear once 50 consecutive fault-free ignition cycles have occurred.
Diagnostic Aids
* The memory seat module is also referred to as the Driver Position Module in certain scan tool menus.
* All position sensors use common 5-volt reference and low reference circuits.
* If the 5-volt reference circuit is shorted to ground or voltage multiple codes will set.
* If the sensor low reference circuit is open multiple codes will set.
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 Verification
Ignition ON, observe the scan tool Driver Position Module driver seat position sensor parameters. The readings should be between 0.25 V and 4.75 V and change while adjusting seat positions.
Circuit/System Testing
1. Ignition OFF, disconnect the appropriate X2, X3, X4 harness connector at the seat adjuster motor assembly.
2. Test for less than 5 Ohms between the appropriate low reference circuit terminal listed below and ground:
* Seat front vertical sensor terminal A
* Seat rear vertical sensor terminal A
* Seat horizontal sensor terminal C
• 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 front vertical sensor terminal C
* Seat rear vertical sensor terminal C
* Seat horizontal sensor terminal A
• 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.
• 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.
4. Verify the appropriate scan tool driver seat sensor parameter listed below is less than 1 V:
* Driver Seat Front Vertical Sensor
* Driver Seat Rear Vertical Sensor
* Driver Seat Horizontal Sensor
• 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 and 5 V reference circuit terminals listed below:
* Seat front vertical sensor terminal B and terminal C
* Seat rear vertical sensor terminal B and terminal C
* Seat horizontal sensor terminal B and terminal A
6. Verify the appropriate scan tool driver seat sensor parameter listed below is greater than 4.75 V:
* Driver Seat Front Vertical Sensor
* Driver Seat Rear Vertical Sensor
* Driver Seat Horizontal Sensor
• If less than the specified value, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
7. If all circuits test normal, test or replace the seat position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Seat Adjuster Motor Replacement (Front Seat Adjuster Motor Replacement)
* Control Module References (Programming and Relearning) for MSM replacement, setup, and programming