Is the fuse open?
Go to Step 10 Go to Step 4
4
With ignition switch in RUN,
test the supply voltage circuit at
the inoperative headlamp
leveling motor connector. Refer
to Circuit Testing .
Is the specified voltage present?
B+
Go to Step 5 Go to Step 11
5
Test the ground circuit at the
inoperative headlamp leveling
motor connector for continuity
to ground. Refer to Circuit
Testing .
Is continuity present?
-
Go to Step 6 Go to Step 12
6
Connect a digital multimeter
(DMM) from ground to the
headlamp leveling motor
supply voltage circuit at the
inoperative headlamp leveling
motor connector and adjust the
headlamp leveling switch from
the highest to lowest setting.
Refer to Circuit Testing .
Does the DMM display within
the specified range?
2.0 V-8.0 V
Go to Step 16 Go to Step 7
7
Test the ground circuit of the
headlamp leveling switch for
continuity to ground. Refer to
Circuit Testing .
Is there continuity?
-
Go to Step 8 Go to Step 13
8
Test the supply voltage circuit
at the headlamp leveling switch
connector. Refer to Circuit
Testing .
Is the specified voltage present?
B+
Go to Step 9 Go to Step 15
9
With the ignition switch in the
OFF position, test for an open,
high resistance, short to ground
or short to voltage in the
headlamp leveling motor
-
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Lighting - H3