* Lumbar horizontal motor terminal 13
* Seat recline motor terminal 15
* Seat recline motor terminal 16
* Adjustable pedal actuator terminal 9
* Adjustable pedal actuator terminal 10
锟斤拷 If 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:
* Lumbar horizontal motor terminal 12
* Lumbar horizontal motor terminal 13
* Seat recline motor terminal 15
* Seat recline motor terminal 16
* Adjustable pedal actuator terminal 9
* Adjustable pedal actuator terminal 10
锟斤拷 If 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 X4 harness connector at the MSM.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuits listed below and ground:
* Lumbar vertical motor terminal 1
* Lumbar vertical motor terminal 2
* Steering wheel tilt actuator terminal 7
* Steering wheel tilt actuator terminal 8
锟斤拷 If 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:
* Lumbar vertical motor terminal 1
* Lumbar vertical motor terminal 2
* Steering wheel tilt actuator terminal 7
* Steering wheel tilt actuator terminal 8
锟斤拷 If not the specified value, test the control circuit for a short to ground.
4. 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 Adjuster Replacement (with HP2) ()Front Seat Adjuster Replacement (without HP2) ()
* Front Seat Recliner Actuator Motor Replacement ()
* Seat Lumbar Sub System Replacement ()
* Brake Pedal Assembly Replacement (See: Accessories and Optional Equipment/Pedal Positioning System/Service and Repair/Removal and
Replacement/Brake Pedal Assembly Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the MSM replacement, programming and setup
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
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
