Hummer H2. Manual - part 640

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). 

Conditions for Running the DTC 

z

Battery voltage is between 9.0 and 16 volts.  

z

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 

z

When the BCM has grounded the right rear power window down relay control circuit and the control 
circuit is shorted to battery positive voltage.  

z

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. 

2: 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.  

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

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

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

DTC B3823 

Step

Action

Yes

No

Schematic Reference: Power Window Schematics 
Connector End View Reference:Power Door Systems Connector End Views

1

Did you perform the Door Systems Diagnostic 
System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Door Systems

2

1. Install a scan tool.  

2. Turn ON the ignition, with the engine OFF.  

3. With a scan tool, command the right rear 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

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. Refer to 
Testing for Intermittent Conditions and Poor 
Connections and Connector Repairs in Wiring 
Systems. 

 

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DTC B3824 

Circuit Description 

Battery positive voltage is supplied to the right rear power window switch and the up and down relays through 
the window lockout signal circuit. If the window lockout function is disabled, the BCM supplies battery 
positive voltage to the switch and relays and the right window operates normally. If the window lockout 
function is enabled, the BCM will not supply battery positive voltage to the switch and relays and the right rear 
window will be inoperative unless it is operated from the driver power window switch. 

Conditions for Running the DTC 

z

Battery voltage is between 9.0 and 16.0 volts  

z

The window lockout function is disabled  

Conditions for Setting the DTC 

z

The window lockout function is disabled and the window lockout signal circuit is shorted to ground.  

z

The above condition must be met for 250 milliseconds.  

Action Taken When the DTC Sets 

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

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. 
Did you complete the replacement?

Go to Step 13

-

12

Replace the Body Control Module. Refer to Body 
Control Module Replacement in Body Control 
System.Did you complete the replacement?

IMPORTANT:

Perform the set up procedure for the Body 
Control Module.

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

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

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. 

DTC B3824 

Step

Action

Yes

No

Schematic Reference: Power Window Schematics 
Connector End View Reference:Power Door Systems Connector End Views

1

Did you perform the Door Systems Diagnostic 
System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Door Systems

2

1. Install a scan tool.  

2. Turn ON the ignition, with the engine OFF.  

3. Disable the window lockout function.  

4. With a scan tool, command the right rear 

power window UP and DOWN.  

Does the right rear power window operate UP and 
DOWN 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. Ensure the window lockout function is 

disabled.  

5. Probe the window lockout signal circuit with 

a test lamp connected to a good ground.  

Does the test lamp illuminate?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 4

4

Test the window lockout signal circuit 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 7

Go to Step 5

5

Inspect for poor connections at the harness 
connector of the Body Control Module. 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 7

Go to Step 6

IMPORTANT:

Perform the set up procedure for the Body 
Control Module.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2