GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 DTC 🢒 DTC B3275

Circuit Description

The express Up function of the power windows is monitored and controlled by the front and rear door modules and the individual window sensors. Each power window motor has a window sensor mounted to it. Each door module communicates with its power window sensor via the power window motor up/down command lines. The power window motors communicate with the door modules via the power window status circuit. The window sensors detect differences in the window motors electrical pulses to determine if there is an obstruction to the travel of the window glass. The power window motors will disable the express up movement of a window in the event that an object has obstructed the windows upward movement.

The power window status circuit is a unique 1-way serial data link between the door module and its power window sensor. The power window motors communicate with there associated door modules by changing the state from high to low over the power window status circuit. For more detailed information concerning power window operation refer to Power Windows Description and Operation .

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3275 Window Express UP or Down Circuit (at door)

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

02

Short to Ground

Conditions for Running the DTC
    • The PDM, LRDM, or RRDM must be powered.
    • DTC B1325 Battery Voltage Out of Range, must not be current.

Conditions for Setting the DTC

The PDM, LRDM, or RRDM detects that the express window switch has been closed for 30 continuous seconds.

Action Taken When the DTC Sets
    • The PDM, LRDM, or RRDM will disable express window functions for the effected window.
    • All other window functions for that window will still operate.

Conditions for Clearing the DTC
    • The condition responsible for setting the DTC no longer exists.
    • You issue a scan tool CLEAR DTCs command.
    • A history DTC will clear once 40 consecutive malfunction free ignition cycles have occurred.

Diagnostic Aids

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Step

Action

Yes

No

Schematic Reference: Moveable Window Schematics

Connector End View Reference: Vehicle Access Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the suspect Window Switch parameter in the appropriate door control module data list:
    4. • Passenger Front Door Module (PDM)
    • Left Rear Door Module (LRDM)
    •  Right Rear Door Module (RRDM)

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3
  1. Activate the appropriate passenger door window express switch.
  2. With the scan tool, observe the Window Switch parameter for the appropriate door control module.

Does the Window Switch parameter change state?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the appropriate passenger door window switch connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Window Switch parameter for the appropriate door control module.

Does the scan tool display Idle?

Go to Step 7

Go to Step 5

5

Test the power window switch express signal circuit(s) of the appropriate passenger door window switch for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the appropriate passenger door control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the appropriate passenger door window switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the appropriate door control module. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

Go to Step 10

--

9

Replace the appropriate passenger door window switch. Refer to Front Side Door Window Switch Replacement or Rear Side Door Window Switch Replacement .

Did you complete the replacement?

Go to Step 10

--

10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK