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 Instructions) provides 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, lumbar, and tilt/telescoping steering column 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 and tilt/telescoping steering.
Conditions for Running the DTC
The MSM must be powered.
Conditions for Setting the DTC
B1395 02
The reference voltage drops below 4.8 volts for more than 300 mS.
B1395 05
The reference voltage exceeds 5.2 volts 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 and set the code to history, 3 seconds after the reference voltage returns to the normal operating range and the ignition is cycled OFF then back to ACC or RUN.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Diagnostic Aids
* All position sensors use common ground and 5-volt reference circuits.
* If the 5-volt reference circuit is shorted to voltage multiple position sensor codes will set.
* If the 5-volt reference circuit is shorted to ground multiple position sensor codes will set.
* A short to voltage on one of the position sensor signal circuits may set this DTC.
* 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)
* Tilt/Telescoping Steering Column Schematics (Tilt/Telescoping Steering Column Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
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 for all position sensors connected to the 5-volt reference circuit.
2. Ignition ON, observe all scan tool sensor parameters for Seat 1 and Column Info. The readings should be 0.0 volts.
• 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.
* Seat horizontal position sensor terminal 3 X2
* Seat front vertical position sensor terminal 1 X2
* Seat rear vertical position sensor terminal 5 X2
* Recline position sensor terminal 2
* Lumbar horizontal position sensor terminal 2
* Lumbar vertical position sensor terminal 2
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit at any one of the position sensors and ground.
• If less than the specified range, test the 5-volt 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-volt 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 (Front Seat Adjuster Replacement)
* Driver or Passenger Seat Lumbar Support Replacement (w/AM3) (Driver or Passenger Seat Lumbar Support Replacement (W/AM3))Driver or Passenger Seat Lumbar Support Replacement (w/AL2) (Driver or Passenger Seat Lumbar Support Replacement (W/AL2))
* Front Seat Recliner Position Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for MSM replacement, setup, and programming