Hummer H2. Manual — part 713
SCAN TOOL OUTPUT CONTROLS
Body Control Module (BCM)
SCAN TOOL DATA LIST
Body Control Module (BCM)
SCAN TOOL DATA DEFINITIONS
Body Control Module (BCM)
Rear Defog Relay
The scan tool displays On or Off. When the BCM energizes the RR DEFOG relay, the scan tool will
display On. When the BCM de-energizes the RR DEFOG relay, the scan tool will display Off.
DIAGNOSTIC TROUBLE CODE (DTC) LIST
Diagnostic Trouble Code (DTC) List
DTC B0283
z
BCM
Does the scan tool display any DTCs?
Go to Step 5
Go to Symptoms -
Stationary Windows
5
Does the scan tool display DTCs that begin with
"U"?
Go to Diagnostic
Trouble Code (DTC)
List in Data Link
Communications
Go to Step 6
6
Does the scan tool display DTC B1000 or B1440?
Go to Diagnostic
Trouble Code (DTC)
List in Body Control
System
Go to Diagnostic
Trouble Code (DTC)
List
Scan Tool
Output Control
Additional Menu
Selection(s)
Description
Rear Defogger
-
The BCM actuates the rear window defogger relay when you
select ON. The rear window defogger grid should become warm.
Scan Tool Parameter
Data List
Units Displayed
Typical Data Value
Ignition On/Engine Off
Rear Defog Relay
Outputs
On/Off
Off
DTC
Diagnostic Procedure
Module(s)
B0283
DTC B0283
BCM
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2
Circuit Description
The body control module (BCM) monitors the voltage level on the control circuit of the DEFOG relay. The
voltage level should be near system voltage while the DEFOG relay is de-energized. The voltage will be pulled
low when the BCM energizes the DEFOG relay. The BCM tests the control circuit of the DEFOG relay every
125 milliseconds.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
One of the following conditions will cause this DTC to set:
z
The BCM detects a high voltage level on the control circuit of the DEFOG relay, while the relay is
energized.
z
The BCM detects a low voltage level or an open on the control circuit of the DEFOG relay, when
commanding the relay On.
Action Taken When the DTC Sets
The rear window defogger will be disabled until the condition is no longer present.
Conditions for Clearing the DTC
z
A current DTC clears when the malfunction is no longer present.
z
A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat
of the malfunction.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2: Listen for an audible click when the DEFOG relay operates. Command both the ON and OFF states.
Repeat the commands as necessary.
3: Tests for voltage at the coil side of the DEFOG relay. The HVAC fuse supplies power to the coil side
of the DEFOG relay.
4: Verifies that the BCM is providing ground to the DEFOG relay.
5: Tests if ground is constantly being applied to the DEFOG relay.
6: Tests for an open on the control circuit of the DEFOG relay.
DTC B0283
Step
Action
Yes
No
Schematic Reference:Defogger Schematics
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2
Connector End View Reference:Stationary Windows Connector End Views
1
Did you perform the Defogger Diagnostic System
Check?
Go to Step 2
Go to Diagnostic
System Check -
Defogger
2
1. Turn ON the ignition, with the engine OFF.
2. Select from miscellaneous test, the Rear
Defogger from the BCM output controls.
3. With a scan tool, command the DEFOG relay
ON and OFF.
Do you hear a click when you command the
DEFOG relay ON and OFF?
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 DEFOG relay.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the ignition
voltage circuit of the DEFOG relay coil and 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 DEFOG relay and the ignition
voltage circuit of the DEFOG relay coil.
2. With a scan tool, command the DEFOG 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 DEFOG relay for an
open or 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 DEFOG 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 DEFOG relay.
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
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2
SYMPTOMS - STATIONARY WINDOWS
1. Perform the Diagnostic System Check - Defogger before using the symptom tables in order to verify
that all of the following are true:
z
There are no DTCs set.
z
The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Rear
Window Defogger Description and Operation .
Visual/Physical Inspection
z
Inspect for aftermarket devices which could affect the operation of the rear window defogger or the
9
Inspect for poor connections at the harness
connector of the 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 an open or high resistance in ignition voltage
circuit of the DEFOG relay coil. Refer to Wiring
Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 13
-
11
Replace the DEFOG relay.
Did you complete the replacement?
Go to Step 13
-
12
Replace the BCM. 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 (BCM). Refer to Body Control
Module (BCM) Programming/RPO Configuration
in Body Control System.
Go to Step 13
-
13
1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for
Setting the DTC as specified in the supporting
text.
Does the DTC reset?
Go to Step 2
System OK
IMPORTANT: For the inside rearview mirror with the automatic day-night feature, review the
system operation in order to familiarize yourself with the system functions.
Refer to Automatic Day-Night Mirror Description and Operation .
For the rear window defogger system, the following steps must be performed
before using the symptom tables:
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2
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