Diagnostic Instructions

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	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5 V Reference	B1395 02, B1825 06, B1850 06, B1860 06, B2355 06, B2365 06, B2375 06, B2880 06	B1825 06, B1850 06, B1860 06, B2355 06, B2365 06, B2375 06, B2880 06	B1395 05, B1825 01, B1850 01, B1860 01, B2355 01, B2365 01, B2375 01, B2880 01	B1825 5A, B1850 5A, B1860 5A, B2355 5A, B2365 5A, B2375 5A, B2880 5A
Driver Seat Front Vertical Position Sensor Signal	B2355 06	B2355 06	B2355 01	--
Driver Seat Horizontal Position Sensor Signal	B2375 06	B2375 06	B2375 01	--
Driver Seat Lumbar Horizontal Position Sensor Signal	B1850 06	B1850 06	B1850 01	--
Driver Seat Lumbar Vertical Position Sensor Signal	B1860 06	B1860 06	B1860 01	--
Driver Seat Rear Vertical Position Sensor Signal	B2365 06	B2365 06	B2365 01	--
Driver Seat Recline Position Sensor Signal	B1825 06	B1825 06	B1825 01	--
Tilt Steering Wheel Position Sensor Signal	B2880 06	B2880 06	B2880 01	--
Memory Seat Sensor Low Reference	--	B1825 01, B1850 01, B1860 01, B2355 01, B2365 01, B2375 01, B2880 01	--	B1825 5A, B1850 5A, B1860 5A, B2355 5A, B2365 5A, B2375 5A, B2880 5A

Circuit/System Description

The memory seat module (MSM) supplies a 5 V reference voltage to the driver seat 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 and steering wheel.

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

Reference Information

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Diagnostic Aids

An internal short to ground in one of the position sensors may set this DTC.

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 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 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

•	Tilt steering wheel 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 after completing the diagnostic procedure.