Power Seats
DTC B1395
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 Instructionsprovides an overview of each diagnostic category.
DTC Descriptors
DTC B1395 02
- Device Voltage Reference Output Circuit Short to Ground
DTC B1395 05
- Device Voltage Reference Output Circuit Short to Battery or Open
Diagnostic Fault Information
Circuit/System Description
The memory seat module (MSM) supplies a 5-volt reference voltage to the driver seat, adjustable pedal, and the tilt steering wheel position sensors. The MSM monitors this reference voltage to ensure the accuracy of the voltages being returned from the sensors. If the voltage exceeds the normal operating range, errors will occur in the memory recall operations of the seat, adjustable pedals, and steering wheel.
Conditions for Running the DTC
The memory seat module must be powered.
Conditions for Setting the DTC
The following conditions exist for more than 1 second:
B1395 02
The reference voltage drops below 4.8 volts for more than 300 mS.
B1395 05
The reference voltage exceeds 5.2 V for more than 300 mS.
Action Taken When the DTC Sets
All memory recall functions will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back to ACC or RUN.
* A history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Diagnostic Aids
An internal short to ground in one of the position sensors may set this DTC.
Reference Information
Schematic Reference
* Driver Seat Schematics Driver Seat Schematics
* Adjustable Pedal Schematics Electrical Diagrams
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 Relearningfor scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector for all position sensors connected to the 5 V reference circuit.
2. Ignition ON, observe all scan tool Driver Position Module sensor parameters in the Data Display screens listed below: The readings should be 0.0 V.
* Seat 1
* Adj. Pedals Info
* Column Info
• If greater than the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
* Horizontal position sensor terminal 3 X2
* Front vertical position sensor terminal 1 X2
* Rear vertical position sensor terminal 5 X2
* Recline position sensor terminal 2
* Lumbar horizontal position sensor terminal D X2
* Lumbar vertical position sensor terminal B X2
* Adjustable pedal position sensor terminal 1
* Steering wheel tilt actuator/position sensor terminal C
3. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit at any one of the position sensors and ground.
• 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. Connect each position sensor one at a time and verify that the DTC does not set as current.
• If the DTC sets as current, replace the appropriate position sensor.
5. If all circuits test normal, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Seat Adjuster Replacement
* Seat Lumbar Sub System Replacement Seat Lumbar Sub System Replacement
* Front Seat Recliner Actuator Motor Replacement Front Seat Recliner Actuator Motor Replacement
* Brake and Accelerator Pedal Adjuster Position Sensor Replacement Service and Repair
* Tilt Motor Replacement Service and Repair
* Control Module References Programming and Relearningfor MSM replacement, setup, and programming