2010 Cadillac Truck SRX AWD V6-3.0L Page 733
If the DTC resets, replace the appropriate control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for instrument cluster, EBCM, HVAC control module,
SDM, ECM, or steering column lock control module replacement, setup, and programming
B3920
DTC B3920
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.
DTC Descriptors
DTC B3920 00
- Driver Seat Motors Group 1 Common Circuit Malfunction
DTC B3920 01
- Driver Seat Motors Group 1 Common Circuit Short to Battery
DTC B3920 02
- Driver Seat Motors Group 1 Common Circuit Short to Ground
DTC B3920 42
- Driver Seat Motors Group 1 Common Circuit Calibration Not Programmed
DTC B3920 0B
- Driver Seat Motors Group 1 Common Circuit High Current
Diagnostic Fault Information
Circuit/System Description
The seat memory control module controls the seat motors via half bridges that are connected to power rails internal to the module. The seat memory
control module connects all of the motor control circuits on each power rail to a common reference point whenever they are not in operation. This
reference point is biased to approximately 2.5 V. The seat memory control module checks to see if this reference voltage is shorted to ground or
battery before enabling any seat motor.
When a power seat switch is pressed or when a memory recall is requested, each seat motor receives battery voltage and ground from the seat
memory control module via the motor control circuits. All motors are reversible, so the direction the motor rotates depends on which control circuit
voltage is applied and which control circuit ground is applied. When the switch is operated in the opposite direction, the module reverses the
