2010 Cadillac CTS Sedan AWD V6-3.6L Page 640
* Seat recline motor terminal 15
* Seat recline motor terminal 16
瀚慖f not the specified value, test the control circuit for a short to ground.
7. If all circuits test normal, replace the MSM.
B3921 01 or B3921 02
1. Ignition OFF, disconnect the X1 harness connector at the MSM.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuits listed below and ground:
* Steering column telescope motor terminal 7
* Steering column telescope motor terminal 8
瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.
3. Test for infinite resistance between the control circuits listed below and ground:
* Steering column telescope motor terminal 7
* Steering column telescope motor terminal 8
瀚慖f not the specified value, test the control circuit for a short to ground.
4. Ignition OFF, disconnect the X4 harness connector at the MSM.
5. Ignition ON, verify that a test lamp does not illuminate between the control circuits listed below and ground:
* Steering column tilt motor terminal 7
* Steering column tilt motor terminal 8
瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.
6. Test for infinite resistance between the control circuits listed below and ground:
* Steering column tilt motor terminal 7
* Steering column tilt motor terminal 8
瀚慖f not the specified value, test the control circuit for a short to ground.
7. If all circuits test normal, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Seat Tilt Adjuster Actuator Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Front Seat Tilt Adjuster
Actuator Replacement)
* Front Seat Adjuster Actuator Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Front Seat Adjuster Actuator
Replacement)
* Driver Seat Outer Adjuster Rear Vertical Actuator Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Driver
Seat Outer Adjuster Rear Vertical Actuator Replacement)
* Seat Lumbar Sub System Replacement (without AHS) (See: Body and Frame/Seats/Service and Repair/Seat Lumbar Sub System
Replacement (Without AHS))Seat Lumbar Sub System Replacement (with AHS) (See: Body and Frame/Seats/Service and Repair/Seat
Lumbar Sub System Replacement (With AHS))
* Front Seat Recliner Actuator Motor Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Front Seat Recliner
Actuator Motor Replacement)
* Steering Column Tilt Wheel Actuator Motor Replacement (See: Steering and Suspension/Steering/Steering Column/Tilt Wheel
Motor/Service and Repair)
* Steering Column Telescope Actuator Motor Replacement (See: Steering and Suspension/Steering/Steering Column/Telescoping Wheel
Motor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming
B3921
DTC B3920 or B3921
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
