switch headlamps off signal circuit.
Did you find and correct a condition?
Go to Step 20
Go to Step 12
9
1. Remove the headlamp relay. Refer to
Relay Replacement (Attached to
Wire Harness) or Relay
Replacement (Within an Electrical
Center) .
2. Place a fused jumper between the
battery positive voltage circuit and
headlamp supply voltage circuit
terminals to the headlamp relay in the
underhood fuse block. Refer to
Electrical Center Identification
Views .
Do the low or high beam headlamps
illuminate?
Go to Step 10
Go to Step 14
10
Test for a ground signal at the headlamp
relay control circuit connector terminal.
Refer to Circuit Testing and Electrical
Center Identification Views .
Is a ground control signal present?
Go to Step 16
Go to Step 11
11
Test for an open or high resistance in the
headlamp relay control circuit. Refer to
Circuit Testing and Electrical Center
Identification Views .
Did you find and correct a condition?
Go to Step 20
Go to Step 12
12
Inspect for poor connections at the harness
connector of the BCM. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 20
Go to Step 15
13
Inspect for poor connections at the harness
connector of the headlamp and panel
dimmer switch. Refer to Circuit Testing
and Wiring Repairs .
Did you find and correct the condition?
Go to Step 20
Go to Step 17
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Lighting - H3