CTS 2003-2005

Fuses

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Autofuse



The Autofuse, normally referred to simply as "fuse" is the most common circuit protection device in today's vehicle. The Autofuse is most often used to protect the wiring assembly between the Fuse Block and the system components.

Minifuse



The MiniFuse is a smaller version of the Autofuse and has a similar performance. As with the Autofuse, the MiniFuse is usually used to protect the wiring assembly between a fuse block and system components. Since the MiniFuse is a smaller device, it allows for more system specific fusing to be accomplished within the same amount of space as Autofuses.

Removal & Installation



Your vehicle likely has several fuse box locations. There may be one or two underhood electrical centers with fuses and relays. There could also be an underdash fuse box. Some models have removable end caps on the instrument panel harboring a fuse box.



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Fig. This underhood fuse box on a Grand Prix has a diagram on the inside of the fuse box cover identifying the circuit protection devices inside



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Fig. This underhood fuse box has its own fuse puller and several spare fuses inside



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Fig. This Lumina also has an underhood fuse box. The cover removes by pressing on the retainer clips



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Fig. Although there is no identification diagram on this Lumina fuse box, at least access is good. Note the remote battery positive terminal cover next to the fuse box

  1. Remove the trim panels or covers necessary for access to the fuses.
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  3. Locate the fuse for the circuit in question.
  4.  


WARNING
When replacing fuses, DO NOT use one with a higher amperage rating.

  1. Check the fuse by pulling it from the fuse box and observing the element. If it is broken, install a replacement fuse of the same amperage rating. If the fuse blows again, check the circuit for a short to ground or faulty device in the circuit protected by the fuse.
  2.  
  3. Continuity can also be checked with the fuse installed in the fuse box with the use of a test light connected across the two test points on the end of the fuse. If the test light lights, replace the fuse. Check the circuit for a short to ground or faulty device in the circuit protected by the fuse.
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