GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The body control module (BCM) grounds the control side of the right rear power window down relay upon receiving a class 2 message from the driver door module (DDM).

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3823 Right Rear Window Down Control Circuit

Conditions for Running the DTC

    • Battery voltage is between 9-16 volts.
    • The BCM has received a class 2 message from the DDM and has grounded the right rear power window down relay control circuit.

Conditions for Setting the DTC

    • When the BCM has grounded the right rear power window down relay control circuit and the control circuit is shorted to battery positive voltage.
    • The above condition is met for 250 milliseconds.

Action Taken When the DTC Sets

The right rear power window will be inoperative from both the driver and right rear power window switches.

Conditions for Clearing the DTC

When the fault is no longer present, the BCM changes the current DTC to a history DTC. The BCM will clear the history DTC after 50 fault free ignition cycles.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Listen for an audible click when the right rear power window relay operates. Command both the ON and OFF states. Repeat the commands as necessary.

  2. Tests for voltage at the coil side of the right rear power window down relay.

  3. Verifies that the BCM is providing ground to the right rear power window down relay.

  4. Tests if ground is constantly being applied to the right rear power window down relay.

Step

Action

Yes

No

Schematic Reference: Power Window Schematics

Connector End View Reference: Power Door Systems Connector End Views

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 a scan tool, command the right rear power window down relay ON and OFF.

Does the right rear power window down relay turn ON and OFF with each command?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the right rear power window switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery positive voltage circuit of the right rear power window switch with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 10

4

  1. Connect a test lamp between the control circuit of the right rear power window down relay and the battery positive voltage circuit of the right rear power window switch.
  2. With a scan tool, command the right rear power window down relay ON and OFF .

Does the test lamp turn ON and OFF with each command?

Go to Step 8

Go to Step 5

5

Does the test lamp remain illuminated with each command?

Go to Step 7

Go to Step 6

6

Test the control circuit of the right rear power window down relay for a short to voltage . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 9

7

Test the control circuit of the right rear power window down relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 9

8

Inspect for poor connections at the right rear power window switch. 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 13

Go to Step 11

9

Inspect for poor connections at the harness connector of the body control module (BCM). 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 13

Go to Step 12

10

Repair the battery positive voltage circuit of the right rear power window switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

--

11

Replace the right rear power window switch. Refer to Rear Side Door Window Switch Replacement .

Did you complete the replacement?

Go to Step 13

--

12

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 13

--

13

  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