B1395 05

DTC B1395

DTC DESCRIPTORS

DTC B1395 02
Device Voltage Reference Output Circuit Shorted to Ground

DTC B1395 05
Device Voltage Reference Output Circuit Shorted to Battery or Open

DIAGNOSTIC FAULT INFORMATION




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM DESCRIPTION
The memory seat module (MSM) supplies a 5-volt reference voltage to the driver seat horizontal, front vertical, rear vertical, recline, and both lumbar 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.

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.

CIRCUIT/SYSTEM TESTING
Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
- If less than 4.8 volts, 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 5.2 volts, test the following circuits for a short to voltage. If all circuits test normal, replace the MSM.
- 5-volt reference circuit
- Each seat and lumbar position sensor signal circuit

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

- Front Seat Adjuster Replacement
- Lumbar Replacement - Front Seat (w/AL2) Lumbar Replacement - Front Seat (w/AM3)
- Power Recliner Sensor Replacement - Front
- Control Module References for memory seat module replacement, setup, and programming Programming and Relearning