GMC 2012 Savana Owner's Manual page 291

Headlamps
Composite
High-Beam
Headlamp
Composite
Low-Beam
Headlamp
Sealed Beam
Headlamp
For replacement bulbs not listed
here, contact your dealer.
9005LL
The vehicle has fuses and circuit
breakers to protect against an
electrical system overload.
9006LL
When the current electrical load is
too heavy, the circuit breaker opens
and closes, protecting the circuit
H6054
until the current load returns to
normal or the problem is fixed.
This greatly reduces the chance of
circuit overload and fire caused by
electrical problems.
Fuses and circuit breakers protect
power devices in the vehicle.
Replace a bad fuse with a new one
of the identical size and rating.
If there is a problem on the road
and a fuse needs to be replaced,
the same amperage fuse can be
borrowed. Choose some feature of
the vehicle that is not needed to use
and replace it as soon as possible.
An electrical overload may cause
the lamps to go on and off, or in
some cases to remain off. Have the
headlamp wiring checked right away
if the lamps go on and off or
remain off.