2010 Cadillac Truck SRX FWD V6-3.0L Page 733

2010 Cadillac Truck SRX FWD 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