Accessories; Fuse/Relay Location And Identification - Hummer H1 Service Manual

12-10 Electrical System
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 auxilliary 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
illustrations and charts in this section for the location of specific
fuses, relays, and circuit breakers. Doing this will enable you to
go directly to the fuse or circuit breaker you want to inspect.
UPPER
MINI-FUSE
BLOCK
INTERIOR FUSE BOX
LOWER
MINI-FUSE
BLOCK
1
Figure 12-17: Interior Fuse Box and Mini Fuse Layout
Fuses and circuit breakers protect the vehicle's electrical sys-
tem from damage caused by overloading. An overloaded cir-
cuit 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 compo-
nents, check the appropriate fuses and circuit breakers for dam-
age (Figure 12-20).
4-1-00
_______________________________________________________
CTIS BUZZER
FLASHER
2 3 4 5 6 7
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 actual wire suppling current to the device. The only inline
fuse used on the Hummer 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 af-
termarket 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 connection made to the adjacent terminal. The main sup-
ply circuits to both sections of the aux. power point are fused to
30 amps. Total amperage draw on either section should not ex-
ceed 30 amps.
IGNITION
BATTERY
H
Figure 12-18: Auxiliary Power Point
G
F
E
D
C
B
A
®
TERMINAL
FUSE SLOT
9-OM5-006