2010 Cadillac CTS Sedan AWD V6-3.6L Page 467

2010 Cadillac CTS Sedan AWD V6-3.6L Page 467

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:

* Terminal 3 (LHD)

* Terminal 1 (RHD)

瀚慖f 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.

瀚慖f 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. Verify the scan tool Driver Seat Recline Sensor parameter is less than 1.0 V.

瀚慖f greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the appropriate 5 V reference circuit terminal listed below. Verify

the scan tool Driver Seat Recline Sensor parameter is greater than 4.75 V.