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Coupe




DTC B1395 (Coupe)

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 V reference to the driver seat and lumbar position sensors, the passenger seat horizontal position sensor, and the 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 memory recall operations.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

B1395 02

The MSM detects a voltage less than 4.8 V for 300 mS on the 5 V reference circuit.

B1395 05

The MSM detects a voltage greater than 5.2 V for 300 mS on the 5 V reference circuit.

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 V reference circuits.
* If the 5 V reference circuit is shorted to voltage multiple position sensor codes will set.
* If the 5 V 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 Control Module Referencesfor 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 sensor parameters for Seat 1 Info. and Column Info. The readings should be 0.0 V.

• 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 B X2
* Seat front vertical position sensor terminal B X2
* Seat rear vertical position sensor terminal B X2
* Recline position sensor terminal 2
* Lumbar horizontal position sensor terminal E
* Steering column telescope position sensor terminal D X2
* Steering column tilt position sensor terminal A X2

3. Ignition ON, at any one of the position sensors, test for 4.8 - 5.2 V between the 5 V reference circuit and ground.

• If less than the specified value, 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 value, 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 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
* Seat Lumbar Sub System Replacement (AQ9) Seat Lumbar Sub System Replacement (AQ9)Seat Lumbar Sub System Replacement (W2E) Seat Lumbar Sub System Replacement (W2E)
* Front Seat Recliner Actuator Motor Replacement Front Seat Recliner Actuator Motor Replacement
* Steering Column Tilt Wheel Position Sensor Replacement Service and Repair
* Control Module References Control Module Referencesfor MSM replacement, setup, and programming

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