Repairing Damaged Wire Insulation
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to SPLICING COPPER WIRE USING SPLICE CLIPS and follow the instruction to repair the wire.