2010 Cadillac CTS Sedan AWD V6-3.6L Page 641

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 641



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 01



- Group 1 Seat Motors Common Circuit Short to Battery



DTC B3920 02



- Group 1 Seat Motors Common Circuit Short to Ground



DTC B3921 01



- Group 2 Seat Motors Common Circuit Short to Battery



DTC B3921 02



- Group 2 Seat Motors Common Circuit Short to Ground



Diagnostic Fault Information



Circuit/System Description



The memory seat module (MSM) controls the seat, recline, lumbar, and steering column motors via half bridges that are divided into 2 groups that



are connected to separate power rails internal to the module. The MSM 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 volts. The MSM checks to see if this



reference voltage is shorted to ground or battery before enabling any seat, lumbar, or steering column motor.



Conditions for Running the DTC



The MSM must be powered.



Conditions for Setting the DTC

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