2010 Cadillac CTS Sedan AWD V6-3.6L Page 471

2010 Cadillac CTS Sedan AWD V6-3.6L Page 471

B1825 5A, B1850 5A, B2355 5A, B2365 5A, or B2375 5A

This DTC will set, if the MSM is controlling a motor in one direction and its position sensor is tracking the motor in the opposite direction. The

sensor is either mounted or wired incorrectly, or the polarity of the motor control circuits are reversed.

Action Taken When the DTC Sets

The MSM disables the memory recall and easy exit/entry action commands of the motor monitored by the sensor. The motor will respond to

manual positioning commands.

Conditions for Clearing the DTC

* The current DTC will clear and set to history, when the MSM sees the analog input from the sensor as between 0.22 V and 4.75 V 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.

* If the sensor ground circuit is open multiple codes will set.

* DTC failure type 5 A will set if the sensor setting this DTC is either mounted or wired incorrectly, or the polarity of the motor control circuits

are reversed.

Reference Information

Schematic Reference

Driver Seat Schematics (See: Body and Frame/Seats/Diagrams/Electrical Diagrams/Driver Seat Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

* Memory Seats Description and Operation (See: Body and Frame/Seats/Description and Operation/Memory Seats)

* Lumbar Support Description and Operation (Without Memory-A45) (See: Body and Frame/Seats/Description and Operation/Lumbar

Support Description and Operation (Without Memory-A45))Lumbar Support Description and Operation (With Memory-A45) (See: Body

and Frame/Seats/Description and Operation/Lumbar Support Description and Operation (With Memory-A45))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Memory Seat Module driver seat and lumbar position sensor parameters. The readings should be between 0.22 V

and 4.75 V and change while adjusting seat and lumbar positions.

Circuit/System Testing

B1825 01 or B1825 06

1. Ignition OFF, disconnect the X2 harness connector at the seat recline motor.

2. Test for less than 2 Ohms between the appropriate low reference circuit terminal listed below and ground:

* Terminal 1 (LHD)

* Terminal 3 (RHD)

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8 - 5.2 V between the appropriate 5 V reference circuit terminal listed below and ground: