LOCATION & REPLACEMENT
See Figures 1, 2, 3, 4 and 5
All electrical equipment is protected from overloading by fuses. Each fuse has an amperage rating that will allow it to transmit a predetermined amount of current before its filament melts, thereby stopping the excessive current flow. By providing this engineered "weak spot" in the circuit, the first failure will occur at a known location (the fuse), eliminating hours of tracing wiring harnesses to locate a problem.
If a fuse blows repeatedly, the trouble is probably in the electrical component that the fuse protects. Never replace a fuse with another of a higher ampere rating. Sometimes a fuse will blow when all of the electrical equipment protected by the fuse is operating, especially under severe weather conditions. For this reason, it is wise to carry a few spare fuses of each type in the car.
When tracking down an inoperative electrical circuit, follow a logical pattern. Wiring itself is rarely the problem on modern cars. Your time is better spent checking the fuse, the component(s) in the circuit, the circuit grounds and the wiring connectors. Remember that in some cases a fuse can look good but not be capable of passing an electrical load. Either remove the fuse and check it with an ohmeter or simply replace it with a new one. Always have the ignition switched off when removing and replacing fuses. On all models, the circuit that each fuse protects is given either on the fuse box cover or in the owners manual. Volvo fuseboxes are located as follows:
On certain models with electronic fuel injection, an additional fuse for the fuel pump is housed in the engine compartment on the left wheel well. Diesel glow plug circuits have a separate fuse located on the bottom of the glow plug relay under the hood.