Friday, October 23, 2020

2010 Cadillac CTS Sedan AWD V6-3.0L Page 2038

2010 Cadillac CTS Sedan AWD V6-3.0L Page 2038



Repair Instructions



Important: Each window regulator motor or front window and door lock switch, if replaced needs to be setup for proper operation.



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.



* Control Module References (See: Testing and Inspection/Programming and Relearning) for window, and door lock switch (door module) or



window regulator motor replacement, setup, and programming



* Electronic Compass Module Replacement (Sedan) (See: Instrument Panel, Gauges and Warning Indicators/Compass/Service and Repair



)Electronic Compass Module Replacement (Wagon) (See: Instrument Panel, Gauges and Warning Indicators/Compass/Service and Repair)



U1511



DTC U1500, U1511, U1512, or U1513



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 U1500 01



- Inter-Device Dedicated Bus 1 Short to Battery



DTC U1500 02



- Inter-Device Dedicated Bus 1 Short to Ground



DTC U1511 00



- Inter-device Dedicated Bus Lost Communication With Device 1



DTC U1512 00



- Inter-device Dedicated Bus Lost Communication With Device 2



Diagnostic Fault Information



Circuit/System Description



The driver door module (DDM) and the front passenger door module (FPDM) communicate with window regulator motors on the local



interconnect network bus 1 and the local interconnect network bus 2 circuits respectively. When the driver power window switch is activated to a



desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no



prohibitive messages have been received, the DDM will send a LIN serial data message to the driver door window motor to move the window to



the desired position.



When the DDM receives a request to operate one of the right side passenger windows from the driver master control, a GMLAN serial data



message is sent to the PDM. The PDM examines the request and checks for messages from other vehicle control modules prohibiting the window



movement. If no prohibitive messages have been received, the PDM will send a LIN serial data message to the appropriate window motor to move



the window as requested.



The DDM and PDM supply their respective rear power window switches with a 12-volt reference and signal circuit. The rear power window



switches contain separate resistors for each switch position. When a rear power window switch is activated, the associated door control module



interprets the signal and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages

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