Hummer H1 (2006+). Manual - part 335
12-16
Electrical System
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FUSE/RELAY LOCATION AND IDENTIFICATION
Interior Fuse Box
The interior fuse box, is located under the instrument panel to the left of the steering column. The fuse box is divided into two mini-
fuse junction blocks, relays, and a auxiliary power point.The mini-fuse blocks may be accessed without removing the main fuse
box cover (Figure 12-17).
To access relays, the main fuse box cover must be removed. Before removing any of the fuse box access covers, refer to the illus-
trations and charts in this section for the location of specific fuses, relays, and circuit breakers. Doing this will enable you to go di-
rectly to the fuse or circuit breaker you want to inspect.
Figure 12-17: Interior Fuse Box and Mini Fuse Layout
Fuses and circuit breakers protect the vehicle's electrical system from damage caused by overloading. An overloaded circuit
breaker will switch the circuit on again, causing intermittent operation. A blown fuse will permanently disable the circuit until the
fuse is replaced.
Whenever a fuse blows or a circuit breaker opens a circuit, all electrical components using that circuit will not operate. Therefore,
during diagnosis of any of these electrical components, check the appropriate fuses and circuit breakers for damage (Figure 12-20).
In Line Fuses
Some fuses are placed in-line with the components they are protecting, meaning they are not located in the fuse box but in the ac-
tual wire suppling current to the device. The only inline fuse used on the HUMMER H1 is in the power feed to the HVAC high
blower relay. This fuse is located on the passenger side of the engine compartment inside a black plastic cover.
Auxiliary Power Point
An auxiliary power point is provided to ease installation of aftermarket electrical accessories. The power point is divided into 2
sections: Ignition and Battery. When a power supply is needed, a fuse must be installed into one of the empty slots, and a connec-
CTIS BUZZER
FLASHER
H
G
F
E
D
C
B
A
UPPER
LOWER
BLOCK
MINI-FUSE
MINI-FUSE
BLOCK
INTERIOR FUSE BOX
7-OM5-001.1
1
2
3
4
5
6
7
5
5
5
5
5
5
5
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7.5
5
5
20
5
5
5
10
7.5
10
–
20
30
15
5
20
15
15
30
25
5
–
7.5
–
15
7.5
5
5
5
7.5
7.5
15
5
5
5
5
30
7.5
–
–
25
5
10
20
30
15
15
25