GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Body 🢒 Doors 🢒 DTC B3527

Circuit Description

This window lockout switch or circuits that generate this diagnostic trouble code (DTC) are built-in parts of the driver door switch assembly (DDSA). There are no external circuits. The DDSA internally supplies power and ground to the contacts of the window lockout switch. When the window lockout switch is operated, the switch contacts momentarily close to ground, providing the DDSA with a signal. The DDSA processes the signal, assigns to digital message to it, then sends the message to the passenger door modules via the class 2 serial data circuit. Upon receiving a class 2 message to lockout the passenger door windows, the passenger door modules will not allow their associated window to operate from the associated passenger door window switch.

If the window lockout is OFF deactivated, it will transition to ON activated when the switch button is momentarily pressed once. If the window lockout is already ON, it will transition to OFF when the switch button is momentarily pressed once. When the lockout is active, the switch button LED will be illuminated and the passenger door windows will not be operational from the passenger door window switches. However, the passenger door windows can still be operated from the appropriate power window switch built into the DDSA.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3527 Window Lockout Switch Circuit Low

Conditions for Running the DTC

With the ignition switch ON, the DDSA checks the switch inputs every 3 seconds regardless of source voltage.

Conditions for Setting the DTC

If the DDSA determines that the window lockout switch is closed, grounded for more than 30 continuous seconds, it sets this DTC.

Action Taken When the DTC Sets

The DDSA ignores inputs from the window lockout switch.

Conditions for Clearing the DTC

The DDSA clears the current code when it no longer receives inputs from the lockout switch.

Diagnostic Aids

An intermittently sticking switch can cause this DTC to set. Refer to Testing for Electrical Intermittents in Wiring Systems.

Test Description

The number below refers to the step numbers on the diagnostic table.

  1. Checks the existing state of the window lockout switch by using the current state of the input parameter.

Step

Action

Yes

No

Schematic Reference: Door Control Module Schematics and Power Window Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
  3. With the scan tool, observe the Window Lockout Sw. parameter in the Driver Door Switch Inputs list.

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3
  1. Activate the window lockout switch to the Lockout position.
  2. With the scan tool, observe the Window Lockout Sw. parameter.

Does the parameter change state?

Go to Diagnostic Aids

Go to Step 4

4

Inspect for poor connections at the driver door switch assembly harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Replace the driver door switch assembly. Refer to Front Door Switch Replacement .

Did you complete the replacement?

Go to Step 6

--

6
  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