Hummer H3. Manual — part 1707
4
Remove the rear defog relay. Refer to
Relay Replacement (Attached to Wire
Harness) or Relay Replacement
(Within an Electrical Center) .
Did the rear window defog turn OFF?
Go to Step 5
Go to Step 8
5
Test for a voltage signal at the rear defog
relay control circuit terminal for the rear
defog relay in the underhood fuse block.
Refer to Electrical Center Identification
Views and Circuit Testing .
Was a voltage signal present?
Go to Step 7
Go to Step 10
6
Test for a short to ground in the rear
defogger switch signal circuit. Refer to
Circuit Testing and Wiring Repairs .
Did you find and correct a condition?
Go to Step 12
Go to Step 11
7
Inspect for poor connections at the harness
connector of the body control module
(BCM). Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct a condition?
Go to Step 12
Go to Step 9
8
Repair the short to voltage in the rear
defog element supply voltage circuit.
Refer to Wiring Repairs .
Did you complete the repair?
Go to Step 12
-
9
Replace the BCM. Refer to Control
Module References for replacement,
setup and programming.
Did you complete the replacement?
Go to Step 12
-
10
Replace the rear defog relay. Refer to
Relay Replacement (Attached to Wire
Harness) or Relay Replacement
(Within an Electrical Center) .
Did you complete the repair?
Go to Step 12
-
11
Replace the HVAC control module. Refer
to Control Module References for
replacement, setup and programming.
Did you complete the repair?
Go to Step 12
-
1. Use the scan tool in order to clear
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3
DEFOGGER GRID LINES DIAGNOSIS
This test is for reference only. A grid line fault requires the rear window replacement. Refer to
Endgate Window Replacement.
1. Start the engine.
2. Activate the rear window defogger system.
3. Connect a test lamp to a good ground.
12
any induced DTCs.
2. Operate the system in order to verify
the repair.
Did you correct the condition?
System OK
Go to Step 3
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3
Fig. 23: Identifying Defogger Grid Line Zones
Courtesy of GENERAL MOTORS CORP.
4. Move the test lamp probe from zone 5 to zone 1 along each grid line.
If the test lamp shows full brilliance at both ends of the grid lines, inspect for an open
or poor connection in the ground circuit of the rear window defogger grid. Refer to
Testing for Intermittent Conditions and Poor Connections and Connector
Repairs .
Fig. 24: Identifying Grid Line Test Locations
Courtesy of GENERAL MOTORS CORP.
If the test lamp goes out, test the grid line in at least 2 places (1, 3) to eliminate the
possibility of bridging the open (2) in the grid line.
REAR WINDOW DEFOGGER INOPERATIVE
IMPORTANT: The test lamp brilliance will decrease proportionately to the
increased resistance in the grid line as the probe is moved
from the battery positive bus wire to the ground bus wire.
The test lamp brilliance may vary from one window to
another.
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3
Test Description
The number below refers to the step number on the diagnostic table.
8: Listen for an audible click when the relay operates. Command both the ON and OFF
states of the rear defog relay. Repeat the commands, as necessary.
Rear Window Defogger Inoperative
Step
Action
Yes
No
Schematic Reference: Defogger Schematics
Connector End View Reference: Master Electrical Component List
1
Did you perform the Diagnostic System
Check - Vehicle?
Go to Step 2
Go to
Diagnostic
System Check -
Vehicle
2
1. Start the engine.
2. Depress the rear defogger switch.
3. Observe the rear defogger indicator
on the HVAC control module.
Does the rear defogger indicator
illuminate?
Go to Step 3
Go to Step 5
3
Connect a test lamp between the supply
voltage side of the rear defogger grid and a
good ground.
Does the test lamp illuminate?
Go to Step 4
Go to Step 8
4
Connect a test lamp between the left side
and the right side of the rear defogger grid.
Does the test lamp illuminate?
Go to Testing
for Intermittent
Conditions and
Poor
Connections
Go to Step 17
5
1. With a scan tool, observe the Rear
Defog Switch parameter in the body
control module (BCM) switch Input
data list.
2. Depress the rear window defogger
switch.
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3
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