A fuse number is useful only when it belongs to the correct vehicle version and fuse box. Two cars with the same badge can have different allocations, and one vehicle can repeat a number in several boxes. Start by identifying the car, then match the protected circuit.
Identify the exact version
Record the model, model year, generation, engine and steering position. Registration year alone may not identify the model year. Use the VIN privately in the manufacturer’s handbook service when available. Note optional equipment such as an amplifier, heated windscreen or powered seats; an unused slot is not proof that a circuit is missing.
Match the box before the number
Locate the named box using the handbook access illustration. Compare its cover, orientation and position labels before counting slots. Passenger-compartment, engine and luggage-compartment tables are separate. In the linked Volvo S80 and V70 guides, CJB must also be distinguished from CEM, even though both are described near the glovebox.
Confirm the circuit and replacement specification
Search by the failed function, then read every note on equipment and applicability. A radio may have separate screen and amplifier supplies. Keep the specified amperage and physical fuse type; colour alone is insufficient across different formats. FirstAutoFix’s interactive buttons are an index of selected circuits, not a drawing of the physical arrangement.
Common question
Can I use a diagram from a different year?
Only if the manufacturer confirms that allocation for your version. If the label and guide disagree, stop and obtain the matching handbook rather than choosing the diagram that looks closest.
Useful pages for your next check
Vehicle-specific fuse guides
Check the model year and equipment notes on each guide before applying a fuse allocation.
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